Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P27: Non-Equilibrium Physics in AMO Systems I: Quenches and Thermalization
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC Room: 404B
Sponsoring Units: DAMOP DCOMP
Chair: Nikolai Sinitsyn, Los Alamos National Laboratory
Abstract: P27.00011 : Quantum Quench in a Model Ising Magnet
4:54 PM–5:06 PM
The Kibble-Zurek (KZ) mechanism predicts the defect density as a function of time after a quench into an ordered state. Extending this formalism from classical to quantum phase transitions (QPTs) entails a quantum tuning parameter that can be varied rapidly compared to the system’s equilibration times. To this end, we study the model transverse Ising magnet LiHoF4, which undergoes a ferromagnet-paramagnet QPT as a function of transverse magnetic field. Pumping with S-band microwaves can saturate the nuclear spin levels, suppressing an effective rescaling of the electronic spin at temperatures below 0.4 K. This should move the phase boundary through a fixed transverse field at frequencies comparable to the 100 kHz single-spin attempt frequency. Using a compact high-Q resonator, we report on initial measurements of the ordering behavior following a quantum quench in the linear and nonlinear response regimes.
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