Proposal for measuring the finite-temperature Drude weight of integrable systems

Article

关键词: MATRIX RENORMALIZATION-GROUP;    THERMAL-CONDUCTIVITY;    ANTIFERROMAGNETIC CORRELATIONS;    CONSERVATION-LAWS;    SPIN;    TRANSPORT;    DYNAMICS;    STATES;    CHAIN;    TIME;   

DOI  :  10.1103/PhysRevB.95.060406

来源: SCIE

【 摘 要 】

Integrable models such as the spin-1/2 Heisenberg chain, the Lieb-Liniger, or the one-dimensional Hubbard model are known to avoid thermalization, which was also demonstrated in several quantum-quench experiments. Another dramatic consequence of integrability is the zero-frequency anomaly in transport coefficients, which results in ballistic finite-temperature transport, despite the presence of strong interactions. While this aspect of nonergodic dynamics has been known for a long time, there has so far not been any unambiguous experimental realization thereof. We make a concrete proposal for the observation of ballistic transport via local quantumquench experiments in fermionic quantum-gasmicroscopes. Such an experimentwould also unveil the coexistence of ballistic and diffusive transport channels in one and the same system and provide a means of measuring finite-temperature Drude weights. The connection between local quenches and linear-response functions is established via time-dependent Einstein relations.

【 授权许可】

Free