Join us for the Physics Condensed Matter Seminar at 10:00 am
Title: Quantum critical and entangled states in magnets
Highly entangled quantum states and the effects of temperature on these are challenging to investigate. One productive approach has been the experimental exploration of quantum magnets with neutron scattering. Here, systems that closely resemble theoretical models are available allowing testing of new ideas and approaches. These can then be used more widely, allowing the exploration of emergent quantum behavior beyond the reach of current theory. In this seminar I will present recent experiments to test the hypothesis of Kardar Parisi Zhang behavior in quantum magnets at finite temperature [1], as well as the use of entanglement witnesses in triangular magnets to detect quantum spin liquid states [2]. In both cases advances in the computation of correlation functions, largely through DMRG, has brought a new perspective and understanding to the scattering results providing a synergetic approach to understanding emergent quantum phenomena.
[1] Allen Scheie et al, “Detection of Kardar-Parisi-Zhang hydrodynamics in a quantum Heisenberg spin-1/2 chain”, Nature Physics, https://doi.org/10.1038/s41567-021-01191-6 (2021).
[2] A. O. Scheie et al, “Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe2”, https://arxiv.org/pdf/2109.11527.pdf
https://berkeley.zoom.us/j/97545820986
Location: virtual (zoom)
Speaker: Alan Tennant
Affiliation: Oak Ridge National Laboratory (ORNL)