Probing the Quench Dynamics of Antiferromagnetic Correlations in a 2D Quantum Ising Spin System
July 4th, 2018 PETER SCHAUSS Princeton University

Simulating the real-time evolution of quantum spin systems far out of equilibrium poses a major theoretical challenge, especially in more than one dimension. Here, we experimentally explore quench dynamics in a two-dimensional Ising spin system with transverse and longitudinal fields. We perform the quantum simulation by preparing a near unit-occupancy atomic array of over 200 atoms obtained by loading a spin-polarized band insulator of fermionic lithium into an optical lattice and induce nearest-neighbor interactions by direct excitation to a low-lying Rydberg state. Using site-resolved microscopy, we probe antiferromagnetic correlations in the system after a sudden quench from a paramagnetic state and compare our measurements to exact calculations in the regimes where it is possible. We achieve many-body states with longer-range antiferromagnetic correlations by implementing a near-adiabatic quench of the longitudinal field and study the buildup of correlations.

Seminar, July 4, 2018, 12:00. ICFO’s Seminar Room

Hosted by Prof. Leticia Tarruell