Events List for the Academic Year

Event Time: Friday, December 14, 2018 | 2:00 pm - 4:00 pm
Event Location:
Room 311, Brimacombe Building, 2355 East Mall
Add to Calendar 2018-12-14T14:00:00 2018-12-14T16:00:00 Final PhD Oral Examination (Thesis Title: “A first principle study of the electronic structure of the bismuthates") Event Information: Examination Programme Event Location: Room 311, Brimacombe Building, 2355 East Mall
Event Time: Thursday, December 13, 2018 | 2:00 pm - 3:00 pm
Event Location:
BRIM 311
Stewart Blusson Quantum Matter Institute
2355 East Mall
Vancouver BC
V6T 1Z4
Add to Calendar 2018-12-13T14:00:00 2018-12-13T15:00:00 CM Seminar: The field theory of specific heat Event Information: The finite temperature field theory for condensed matter physics, based on the kernel of the evolution equation, was recently proposed. The field theory is scale-free formalism, so it denies the absolute scale of thermodynamic temperature and uses dimensionless thermal variables, which are defined by the group velocities of sound and the interatomic distances, combined with the defining constants of the New SI. The universal thermal functional is obtained and used to derive the specific heat of condensed matter. The field theory of specific heat predicts the fourth power of temperature at sufficiently low temperature instead of the Debye theory’s cubic law. Experimental data for various condensed matter systems, including diamond lattice crystals, glasses and even solid helium-4, confirm the quartic law. The range of temperature with the fourth order behaviour varies, so it is called the quasi-low temperature regime specified by the characteristic temperature and the dimensionless constant. The critique of the Debye theory of specific heat is given. Event Location: BRIM 311 Stewart Blusson Quantum Matter Institute 2355 East Mall Vancouver BC V6T 1Z4
Event Time: Tuesday, December 11, 2018 | 12:30 pm - 2:30 pm
Event Location:
MCML 256, HR MacMillan Building, 2357 Main Mall
Add to Calendar 2018-12-11T12:30:00 2018-12-11T14:30:00 Final PhD Oral Examination (Thesis Title: “Emergent Spacetime in Matrix Models”) Event Information: Abstract: We study the noncommutative geometry associated to matrices of N quantum particles in the matrix models. The earlier work established a surface embedded in flat R3 from three Hermitian matrices. We construct coherent states corresponding to points in the emergent geometry and find the original matrices determine not only shape of the emergent surface, but also a unique Poisson structure. We prove that commutators of matrix operators correspond to Poisson brackets. Through our construction, we can realize arbitrary noncommutative membranes embedded in R3. We further conjecture an embedding operator which assigns, to any (2n + 1) Hermitian matrices, a 2n-dimensional hypersurface in flat (2n + 1)-dimensional Euclidean space. This corresponds to precisely defining a fuzzy D(2n)-brane corresponding to N D0-branes. Points on the hypersurface correspond to zero eigenstates of the embedding operator, which have an interpretation as coherent states underlying the emergent noncommutative geometry. Using this correspondence, all physical properties of the emergent D(2n)-brane can be computed. Many works have been done in exploring the geometry emerged from the matrix configuration, but they do not always produce consistent results. We apply two types of point probe methods and the supergravity charge density formula on the generalized fuzzy sphere S2so(4). Its tangled structure challenges the applicability of the probing methods. We propose to disentangle blocks of S2so(4) regarding the geometrical symmetry and retrieve S2so(4) as a thick two sphere with coherent layers consistently in three methods. The Yang-Mills matrix model with mass term representing IR cutoff on the effective radius generates remarkable spherical solutions of the emergent universe, but it is unsolvable, unlike matrix models dominated by the Gaussian potential. By coarse-graining the dimension of matrices, quantum gravity is reproduced by the Gaussian model at the fixed point of dimensional renormalization group flow. We approach the unsolvable YM model by the same dimensional renormalization and discover a non-trivial fixed point after imposing the spherical topology. The fixed point might lead to a new duality between quantum gravity and the massive YM model in the continuum limit, and its existence also sets a density condition on the generalized fuzzy sphere. Event Location: MCML 256, HR MacMillan Building, 2357 Main Mall
Event Time: Monday, December 10, 2018 | 3:00 pm - 4:00 pm
Event Location:
Hennings 318
Add to Calendar 2018-12-10T15:00:00 2018-12-10T16:00:00 Goodnight, and thanks for all the planets Event Information: On 30th October, the Kepler spacecraft was powered down, initiating the final closeout sequence to cease operations.  We'll pay homage to the mission by playing back some of the science highlights.  We'll also consider Kepler's exoplanet legacy - what it leaves behind and what roles it yet has to play in the next era of exoplanet exploration led by TESS and JWST. Event Location: Hennings 318
Event Time: Sunday, December 9, 2018 | 2:00 pm - 3:30 pm
Event Location:
LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building.
Add to Calendar 2018-12-09T14:00:00 2018-12-09T15:30:00 Magic? Or Physics? 2018 Faraday Science Show Event Information: WHERE: LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building. WHEN: SUNDAY, December 9, 2018, 2:00-3:30 PM COST: FREE! (But bring non-perishable food items to support the Greater Vancouver Food Bank!) No RSVP required, though we recommend arriving 15-20 minutes earlier for good seats. The Faraday Show is UBC's annual science show for children, presented by UBC Physics & Astronomy. This year join us to explore the scientific secrets behind magical wonders! Why would something roll uphill, not downhill? Can you make something moving away come back just by thinking? How can a plate float in mid-air, with no one touching it? How can we make things disappear, and reappear? We will explore these questions, and more, through lively demonstrations and hands-on activities. This show is for children of ALL AGES, and adults who are young at heart! For more information please contact the outreach program at: outreach@phas.ubc.ca / 604-822-0596. Event Location: LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building.
Event Time: Sunday, December 9, 2018 | 2:00 pm - 3:30 pm
Event Location:
LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building.
Add to Calendar 2018-12-09T14:00:00 2018-12-09T15:30:00 Magic? Or Physics? 2019 Faraday Science Show Event Information: WHERE: LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building. WHEN: SUNDAY, December 9, 2018, 2:00-3:30 PM COST: FREE! (But bring non-perishable food items to support the Greater Vancouver Food Bank!) No RSVP required, though we recommend arriving 15-20 minutes earlier for good seats. The Faraday Show is UBC's annual science show for children, presented by UBC Physics & Astronomy. This year join us to explore the scientific secrets behind magical wonders! Why would something roll uphill, not downhill? Can you make something moving away come back just by thinking? How can a plate float in mid-air, with no one touching it? How can we make things disappear, and reappear? We will explore these questions, and more, through lively demonstrations and hands-on activities. This show is for children of ALL AGES, and adults who are young at heart! For more information please contact the outreach program at: outreach@phas.ubc.ca / 604-822-0596. Event Location: LIFE building room 2201, 6138 Student Union Boulevard (UBC CAMPUS). The North Parkade is the closest parking lot to the LIFE Building.
Event Time: Thursday, December 6, 2018 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201
Add to Calendar 2018-12-06T16:00:00 2018-12-06T17:00:00 The human voice, the erhu and the violin Event Information: The Western violin and the erhu, the Chinese violin, are at first glance, markedly different instruments, being apparently related only by their bows. The violin soundbox is made of spruce and maple, has a complex shape, and an asymmetrical interior. The erhu soundbox is a simple cylinder closed on one side by a pre-tensioned python skin and open at the other. However, delving into the vibro-acoustics of each structure, deep similarities emerge, both with each other and with that most ancient musical instrument, the human voice. Acoustics is a field that tends to fall between the cracks of physics and engineering, and musical acoustics falls between the cracks of acoustics and music. Thus I will not assume any prior knowledge of the field. Event Location: Hennings 201
Event Time: Thursday, December 6, 2018 | 2:00 pm - 3:00 pm
Event Location:
BRIM 311
2355 East Mall
Vancouver BC
V6T 1Z4
Add to Calendar 2018-12-06T14:00:00 2018-12-06T15:00:00 CM Seminar: Muons for the Quantum Matter Event Information: A S=1/2 polarized particle, which may couple to the near-by electron is the simplest quantum mechanical object, as you may find in the standard text books. In reality, a particle called positive muon (µ+), provides such experimental observations. TRIUMF in the UBC south campus, which is also my home institute since this August, provides muon beams for material science research. In the seminar this time, I would like to introduce some of my research work in which muons played important roles. The subject involves phase diagram of iron pnictide superconductors [1], electrides [2,3] and wide gap semiconductors. The muon characterization has the feature of a sensitive magnetic probe as well as a Hydrogen isotope which extracts its electronic state in the dilute limit.   [1] “Bipartite magnetic parent phases in the iron oxypnictide superconductor.”  M. Hiraishi, S. Iimura, K. M. Kojima, et al., Nature Physics, 10, 300–303, (2014). [2] “Cage electron-hydroxyl complex state as electron donor in mayenite.” M. Hiraishi, K. M. Kojima, et al., Phys. Rev. B., 93, 121201(R), (2016). [3] “Electronic correlation in the quasi-two-dimensional electride Y2C”, M. Hiraishi, K.M. Kojima, et al., Phys. Rev. B. 98, 041104(R) (2018). Event Location: BRIM 311 2355 East Mall Vancouver BC V6T 1Z4
Event Time: Wednesday, December 5, 2018 | 12:30 pm - 1:30 pm
Event Location:
Henn 318. 6224 Agricultural Rd.
Add to Calendar 2018-12-05T12:30:00 2018-12-05T13:30:00 A Functional Approach to Soft Graviton Induced Decoherence Event Information: We consider the interaction between a matter system and soft gravitons. We use a functional eikonal expansion to deal with the infrared divergences, and introduce a "composite generating functional" which allows us to calculate a decoherence functional for the time evolution of the system. These techniques allow us to formulate scattering problems in a way which deals consistently with infrared effects, as well as being manifestly diffeomorphism invariant. We show how the asymptotic form of the decoherence functional can be written in terms of the infinitely many conserved charges associated with asymptotic BMS symmetries, and allow us to address the question of how much information is lost during the scattering. Event Location: Henn 318. 6224 Agricultural Rd.
Event Time: Monday, December 3, 2018 | 3:00 pm - 4:00 pm
Event Location:
Hennings 318
Add to Calendar 2018-12-03T15:00:00 2018-12-03T16:00:00 The Potential Habitability of Rocky Planets around Red Dwarfs: Stellar Drivers for Atmospheric Chemistry and Stability Event Information: ABSTRACT: High-energy photons and particles from stars regulate the atmospheric temperature structure and photochemistry on orbiting planets, influencing the long-term stability of planetary atmospheres and the production of potential “biomarker” gases.  Rocky planets orbiting low-mass stars (M dwarfs) will likely be the first exoplanets directly probed for signs of life, however, relatively few observational and theoretical constraints exist on the high-energy irradiance from typical (i.e., weakly active) M dwarf exoplanet host stars.  In this talk, I will describe results from an ongoing panchromatic survey (Chandra/XMM/Hubble/ground) of M and K dwarf exoplanet hosts. The MUSCLES* Treasury Survey combines UV, X-ray, and optical observations, reconstructed Lyman-alpha and EUV (10-90 nm) radiation, and next-generation stellar atmosphere models to provide realistic inputs for modeling the stability and climate on potentially habitable planets around red dwarfs. Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm Event Location: Hennings 318
Event Time: Monday, December 3, 2018 | 10:00 am - 11:00 am
Event Location:
Hennings 318
Add to Calendar 2018-12-03T10:00:00 2018-12-03T11:00:00 All-optical Field-free Three-Dimensional Orientation of Asymmetric-Top Molecules Event Information: Orientation and alignment of molecules by ultrashort laser pulses is crucial for a variety of applications and have long been of interest in physics and chemistry, with the special emphasis on stereodynamics in chemical reactions and molecular orbitals imaging. As compared to the laser induced molecular alignment, which has been extensively studied and demonstrated, achieving molecular orientation is a much more challenging task, especially in the case of asymmetric-top molecules. Here, we report the experimental demonstration of all-optical field-free three-dimensional orientation of asymmetric-top molecules by means of phase-locked cross-polarized two-color laser pulse. This approach is based on nonlinear optical mixing process caused by the off-diagonal elements of the molecular hyperpolarizability tensor. It is demonstrated on SO2 molecules and is applicable to a variety of complex nonlinear molecules. Nat. Commun, 2018 (in press) DOI: 10.1038/s41467-018-07567-2    Event Location: Hennings 318
Event Time: Friday, November 30, 2018 | 11:00 am - 12:00 pm
Event Location:
Hennings 309
Add to Calendar 2018-11-30T11:00:00 2018-11-30T12:00:00 Anomalous Dimensions for Conserved Currents from Holographic Dilatonic Models to Superconductivity Event Information: It is well known that the dimension of conserved currents is determined simply from dimensional analysis. However, a recent proposal is that what is strange about the conserved currents in the strange metal in the cuprate superconductors is that they carry anomalous dimensions. The basic model invoked to exhibit such behaviour is a holographic dilatonic one in which the field strength couples to the radial coordinate. I will show that the anomalous dimension in such cases arises from a fractional electromagnetism that can be thought of as a general loop-hole in Noether's second theorem. The general mechanism operative is a mass term in the IR that couples to the UV current. Such a mass that couples to the radial component of the gauge field introduces a breaking of U(1) everywhere except at the boundary. I will also show that even the Pippard kernel invoked to explain the Meissner effect in traditional low-temperature superconductors is a special case of the non-local action found here, implying that symmetry breaking is the general mechanism for fractional electromagnetisms. I will also construct the Virasoro algebra for such fractional currents and discuss the general implications for the bulk-boundary construction in holography. Event Location: Hennings 309
Event Time: Thursday, November 29, 2018 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201
Add to Calendar 2018-11-29T16:00:00 2018-11-29T17:00:00 The Future of Cancer Medicine: Personal or Industrial? Event Information: Our characterization of cancer is advancing rapidly through the ever-increasing ability to make quantitative measurements of the cancerous tissues with new tools and technologies. These include continuously improving methods of sequencing the genome, advances in imaging that allow us to non-invasively characterize the biology of the disease in-situ, and the potential to integrate circulating biomarkers of response.  The myriad of new signals that characterize the complex biology of cancer is compounded by the diversity of the human form.  Characterizing the human ‘phenome’ – the detailed description of the patient and their biological state – is becoming critical for accurate prediction of clinical outcomes of a given therapy and is associated with the development of ‘precision’ or ‘personalized’ cancer medicines.  Furthermore, the myriad of inputs to the decision-making process is challenging the capabilities of our human cognition and the healthcare system in general to deliver the new complex treatments with the precision required to realise the potential of these personalized therapies.  Taken together, the traditional model of cancer medicine needs to be transformed from a fairly ad-hoc process of assessment, diagnosis, and treatment into something far more coordinated.  Therein lies the paradox that ‘medicine must industrialize to personalize care’. Just as automation has allowed manufacturing to deliver highly customized products at scale, so too must medicine.   The implications are important across all of cancer medicine and align with the need for improvements in patient safety, quality of care, clinical outcomes, and patient experience.  The development of digital technologies will allow this transformation to occur and, if properly implemented, will not only advance care, but will also accelerate the pace of scientific discoveries required to make real progress against this disease. Event Location: Hennings 201
Event Time: Thursday, November 29, 2018 | 2:00 pm - 3:00 pm
Event Location:
AMPL 311
Add to Calendar 2018-11-29T14:00:00 2018-11-12T15:00:00 Moiré is Different: Wigner Solidification at Magic Angles in Doped Twisted bi-layer Graphene Event Information: In a recent paper, the MIT group led Pablo Jarillo-Herrero has found that doping twisted bi-layer graphene can generate strongly correlated insulating states and superconductivity at particular twist angles called magic angles.   This problem has excited the condensed matter community because it establishes that graphene, normally viewed as a weakly  interacting system, is a new platform for strongly correlated physics.    The experimentalists as well as a host of theorists have attributed the insulating states to Mottness.  However, this interpretation has been called into question because the simplest experimental set-up in which one charge resides in each unit cell exhibits metallic transport not Mott insulation.  I will review the experiments and 1) explain why the one-electron/unit cell case is a metal, 2) show that the insulating behaviour is consistent with a series of Wigner crystalline states that are enhanced by hydrostatic pressure as observed in the newest experiments of Dean and Young, and 3) discuss how superconductivity arises from doping  such crystalline states.   Event Location: AMPL 311
Event Time: Wednesday, November 28, 2018 | 3:30 pm - 4:30 pm
Event Location:
Hennings 301
Add to Calendar 2018-11-28T15:30:00 2018-11-28T16:30:00 Leveraging Space to Promote Engagement in Intermediate Electricity & Magnetism Event Information: Physics 301 has been flagged as a challenging course in the department for a myraid of reasons.  First, this is one of the first “advanced” physics courses.  While the content is largely familiar, students must integrate ideas from previous physics and math courses and utilize a coordinated set of tools when solving problems.  Secondly, the class is comprised of 160-180 students from a variety of programs, with variations in prerequisite courses and incoming abilities.  This talk will cover how we’ve utilized the active learning theater (Henn200) to promote collaboration and engagement to teach this notoriously difficult course.   Event Location: Hennings 301
Event Time: Wednesday, November 28, 2018 | 1:00 pm - 2:00 pm
Event Location:
Henn 318. 6224 Agricultural Rd.
Add to Calendar 2018-11-28T13:00:00 2018-11-28T14:00:00 Extreme fine-tuning of the cosmological constant is not needed Event Information: We show that when the bare cosmological constant in the Einstein field equations takes large negative values, the average distance between any two nearby geodesics moving in the spacetime sourced by quantum fields vacuum would gradually increase at a slow accelerating rate due to the weak parametric resonance effect caused by the fluctuations of the quantum vacuum energy density. In this scenario, the extreme fine-tuning of the cosmological constant is not needed. This resolves the cosmological constant problem and provides an explanation to the accelerating expansion of our universe. Event Location: Henn 318. 6224 Agricultural Rd.
Event Time: Wednesday, November 28, 2018 | 12:30 pm - 2:30 pm
Event Location:
Room D207, Buchanan Block D Building
Add to Calendar 2018-11-28T12:30:00 2018-11-28T14:30:00 Final Doctoral Oral Examination for ALAN PATRICK MANNING Event Information: Thesis Title: T1 Relaxation and Inhomogeneous Magnetization Transfer in Brain: Physics and Applications Abstract: A major goal of the Magnetic Resonance Imaging (MRI) community is myelin quantification in white matter. MRI contrast depends on tissue microstructure, so quantitative models require good understanding of Nuclear Magnetic Resonance (NMR) physics in white matter's complex, heterogeneous environment. In this thesis, we study the underlying physics behind two different 1H contrast mechanisms in white and grey matter tissue: T1 relaxation and the recently developed Inhomogeneous Magnetization Transfer (ihMT). Using ex-vivo white and grey matter samples of bovine brain, we performed a comprehensive solid-state NMR study of T1 relaxation under six diverse initial conditions. For the first time, we used lineshape fitting to quantify the non-aqueous magnetization during relaxation. A four pool model describes our data well, matching with earlier studies. We also show examples of how the observed T1 relaxation behaviour depends upon the initial conditions. ihMT's sensitivity to lipid bilayers, like those in myelin, was originally thought to rely upon hole-burning in the supposedly inhomogeneously-broadened lipid lineshape. Our work shows that this is incorrect and that ihMT only requires the presence of dipolar coupling, not a specific kind of line broadening. We developed a simple explanation of ihMT using a spin-1 system. We then performed ihMT and T1D measurements (dipolar order relaxation time) using solid-state NMR on four samples: a multilamellar lipid system (Prolipid-161), wood, hair, and bovine tendon. ihMT was observed in all samples, even those with homogeneous broadening (wood and hair). Moreover, we saw no evidence of hole-burning. Lastly, we present results from ihMT experiments with CPMG acquisition on the same bovine brain samples. We show that myelin water has a higher ihMT signal than water outside the myelin. It was determined that this was due to the unique thermal motion in myelin lipid. In doing so, we developed a useful metric for determining magnetization transfer's and dipolar coupling's relative contributions to ihMT. Also, we applied a four pool model with dipolar reservoirs as a qualitative model. Together, our results are consistent with myelin lipids having a uniquely long T1D, despite recent measurements to the contrary. Event Location: Room D207, Buchanan Block D Building
Event Time: Monday, November 26, 2018 | 3:00 pm - 4:00 pm
Event Location:
Hennings 318
Add to Calendar 2018-11-26T15:00:00 2018-11-26T16:00:00 Hunting for Cool Brown Dwarfs with WISE Event Information: ABSTRACT: The study of brown dwarfs with effective temperatures less than 500 K can offer important insights into the complex physics of ultracool atmospheres, the shape of the initial mass function, and the low-mass limit of star formation. We have been using the Wide-field Infrared Survey Explorer (WISE) to search for just such a population of brown dwarfs and have identified roughly twenty cool browns dwarfs that populate a new spectral class, dubbed 'Y'. In this talk, I will present the discovery of the Y dwarfs, summarize our current understanding of their basic physical properties, discuss how HST photometry has improved our understanding of the coolest (Teff ~ 250 K) brown dwarf known, WISE 0855-0714, and discuss our initial attempts to understand condensate clouds in Y dwarf atmospheres using joint HST+Spitzer observations. Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm Event Location: Hennings 318
Event Time: Thursday, November 22, 2018 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201
Add to Calendar 2018-11-22T16:00:00 2018-11-22T17:00:00 Biomechanics and neural control of maneuvering flight Event Information: My research program is motivated by fascination with bird flight. My laboratory group uses a multi- disciplinary approach that includes biomechanics, physiology, and neuroscience to examine flight ability. Our current research is organized around two topics: 1) how birds morph their wings and what benefits this provides; and 2) how optic flow signals are encoded in the avian brain and used to guide their flight. As we gain understanding of flight mechanisms, we further endeavor to apply comparative approaches that provide deeper insight into avian ecology and evolution. Event Location: Hennings 201
Event Time: Thursday, November 22, 2018 | 2:00 pm - 3:00 pm
Event Location:
BRIM 311
Add to Calendar 2018-11-22T14:00:00 2018-11-22T15:00:00 CM Seminar: TOPOLOGICAL CAVITY STATES IN TWO-DIMENSIONAL PHOTONIC/PHONONIC CHIPS Event Information: Topological insulators are electronic systems with an insulating bulk and topologically protected boundary states. Conventional 2D topological insulators induce 1D edge states. Recent studies indicate that lower-dimensional topological states are also possible in electronic systems through higher-order topology, which, however, has been confirmed only in Bismuth in experiments [1]. In this talk, I will show that lower-dimensional topological wave trapping can be achieved in photonic and acoustic systems through several different mechanisms. First, with concurrent real-space and wavevector-space topology, we show topological 0D light-trapping on a dislocation [2]. Second, with two different schemes of higher-order topological insulators, we demonstrate topological 0D corner states in photonic crystals and sonic crystals [3,4]. The underlying physics indicates the possibility of achieving frequency-stable topological cavity states in two-dimensional photonic/phononic chips that may enable scalable quantum photonic interface and other unprecedented functions in integrated photonics/acoustics. [1] F. Schindler et al. Higher-order topology in bismuth. Nature Physics 14, 918-924 (2018). [2] Fei-Fei Li, Hai-Xiao Wang, Zhan Xiong, Qun Lou, Ping Chen, Rui-Xin Wu, Yin Poo, Jian-Hua Jiang, and Sajeev John. Topological light-trapping on a dislocation. Nature Communications 9, 2462 (2018) [3] Bi Ye Xie, Hong Fei Wang, Hai-Xiao Wang, Xue Yi Zhu, Jian-Hua Jiang, Ming Hui Lu, and Yan Feng Chen. Second-order photonic topological insulator with corner states. arXiv:1805.07555. Physical Review Letters under review. [4] Xiujuan Zhang, Hai-Xiao Wang, Zhi-Kang Lin, Yuan Tian, Biye Xie, Ming-Hui Lu, Yan-Feng Chen, and Jian-Hua Jiang. Observation of second-order topological insulators in sonic crystals. arXiv:1806.10028. Nature Physics under review. Event Location: BRIM 311