Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.54: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Dynamically generated quadrupole polarization using Floquet adiabatic evolution — •Gonzalo Camacho, Christoph Karrasch, and Roman Rausch — Technische Universität Braunschweig, Institut für Mathematische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany

We investigate the nonequilibrium dynamics of the S = 1 quantum spin chain subjected to a time-dependent external drive, where the driving frequency is adiabatically decreased as a function of time (Floquet adiabatic evolution). We show that, when driving the rhombic anisotropy term (known as the two-axis countertwisting in the context of squeezed spin states) of a Néel antiferromagnet, we can induce an overall enhancement in the quadrupole polarization, while at the same time suppressing the staggered magnetization order. The system evolves into a new state with a net quadrupole moment and antiferroquadrupolar correlations. This state remains stable at long times once the driving frequency is kept constant. On the other hand, we find that we cannot achieve a quadrupole polarization for the symmetry-protected Haldane phase, which remains robust against such driving.

[1] C. Camacho et al., Phys. Rev. Res. 5, 023015 (2023)

Keywords: Floquet engineering; Haldane phase; TEBD; spin chain; antiferromagnet