Monopolar and dipolar relaxation in classical spin ice

Event Date:
2021-01-27T12:00:00
2021-01-27T13:00:00
Event Location:
https://ubc.zoom.us/j/65104619882?pwd=UE80WkY4RXdEMFMxU2VCbEFwaXhjdz09 Passcode: 428347
Speaker:
Yishu Wang
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Event Information:

The quantum spin liquid is a hypothesized state characterized by macroscopic entanglement and fractionalized quasiparticles. While the physical realization of long-range entanglement of spins remains elusive, the phenomenon of spin fractionalization has been exemplified by magnetic monopoles in classical spin ice. In this talk, I will discuss how we experimentally distinguish emergent monopoles from individual spin dipoles through magnetic relaxation dynamics of spin ice Ho2Ti2O7. Combining time-resolved neutron scattering and broad-band magnetometry, we have probed over ten decades of time scales and uncovered a thermal crossover between two distinct relaxation processes. Magnetic relaxation at low temperatures is associated with monopole motion through the spin-ice vacuum, while at elevated temperatures, relaxation occurs through reorientation of spin dipoles. Disorders serve as a tuning parameter of monopole mobility, suggesting a potential controlling method of achieving coherent monopole dynamics in quantum spin ice.

Reference

Y. Wang et al., Monopolar and dipolar relaxation in spin ice Ho2Ti2O7, arXiv: 2011.06477 (2020)

Add to Calendar 2021-01-27T12:00:00 2021-01-27T13:00:00 Monopolar and dipolar relaxation in classical spin ice Event Information: The quantum spin liquid is a hypothesized state characterized by macroscopic entanglement and fractionalized quasiparticles. While the physical realization of long-range entanglement of spins remains elusive, the phenomenon of spin fractionalization has been exemplified by magnetic monopoles in classical spin ice. In this talk, I will discuss how we experimentally distinguish emergent monopoles from individual spin dipoles through magnetic relaxation dynamics of spin ice Ho2Ti2O7. Combining time-resolved neutron scattering and broad-band magnetometry, we have probed over ten decades of time scales and uncovered a thermal crossover between two distinct relaxation processes. Magnetic relaxation at low temperatures is associated with monopole motion through the spin-ice vacuum, while at elevated temperatures, relaxation occurs through reorientation of spin dipoles. Disorders serve as a tuning parameter of monopole mobility, suggesting a potential controlling method of achieving coherent monopole dynamics in quantum spin ice. Reference Y. Wang et al., Monopolar and dipolar relaxation in spin ice Ho2Ti2O7, arXiv: 2011.06477 (2020) Event Location: https://ubc.zoom.us/j/65104619882?pwd=UE80WkY4RXdEMFMxU2VCbEFwaXhjdz09 Passcode: 428347