CM Seminar: Kondo Blockade and Generative Hamiltonian Learning for molecular electronics

Event Date:
2019-06-06T14:00:00
2019-06-06T15:30:00
Event Location:
BRIM 311
Speaker:
Prof. Andrew Mitchell, University College Dublin, Ireland
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Event Information:

Abstract:  When nanoscale components are incorporated into external circuits, electronic transport can exhibit striking quantum phenomena with no classical analogue. Molecular junctions, in which a single molecule bridges the gap in a nanowire, constitute a particularly rich set of systems, demonstrating both strong correlation effects such as Coulomb blockade and Kondo, as well as quantum interference arising from orbital complexity. In this seminar, I discuss a general strategy for understanding the fundamental physics of such systems, which involves mapping complex microscopic models for the junction onto simpler generalized impurity problems that can be treated exactly. I highlight the limitations of the standard perturbative approaches, and introduce a new method for deriving effective models via machine learning techniques. The consequences for experimentally measurable quantum transport in molecular junctions are explored, including so-called "Kondo blockade".

[1] Nature Communications, 8, 15210 (2017)

Bio: Prof. Andrew Mitchell is a condensed matter theorist working on strongly correlated electron systems in the context of nanoelectronics, including quantum dot devices and molecular electronics. He obtained his PhD from Oxford University in 2010, and had postdoctoral fellowships at Cologne, Oxford, and Utrecht, before taking up a permanent position in theoretical physics at University College in Dublin, Ireland.

 

Add to Calendar 2019-06-06T14:00:00 2019-06-06T15:30:00 CM Seminar: Kondo Blockade and Generative Hamiltonian Learning for molecular electronics Event Information: Abstract:  When nanoscale components are incorporated into external circuits, electronic transport can exhibit striking quantum phenomena with no classical analogue. Molecular junctions, in which a single molecule bridges the gap in a nanowire, constitute a particularly rich set of systems, demonstrating both strong correlation effects such as Coulomb blockade and Kondo, as well as quantum interference arising from orbital complexity. In this seminar, I discuss a general strategy for understanding the fundamental physics of such systems, which involves mapping complex microscopic models for the junction onto simpler generalized impurity problems that can be treated exactly. I highlight the limitations of the standard perturbative approaches, and introduce a new method for deriving effective models via machine learning techniques. The consequences for experimentally measurable quantum transport in molecular junctions are explored, including so-called "Kondo blockade". [1] Nature Communications, 8, 15210 (2017) Bio: Prof. Andrew Mitchell is a condensed matter theorist working on strongly correlated electron systems in the context of nanoelectronics, including quantum dot devices and molecular electronics. He obtained his PhD from Oxford University in 2010, and had postdoctoral fellowships at Cologne, Oxford, and Utrecht, before taking up a permanent position in theoretical physics at University College in Dublin, Ireland.   Event Location: BRIM 311