颗粒 Sachdev-Ye-Kitaev 物质的量子临界性。

Quantum Criticality of Granular Sachdev-Ye-Kitaev Matter.

机构信息

Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.

W. I. Fine Theoretical Physics Institute and School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

出版信息

Phys Rev Lett. 2019 Sep 6;123(10):106601. doi: 10.1103/PhysRevLett.123.106601.

DOI:10.1103/PhysRevLett.123.106601

PMID:31573290

Abstract

We consider granular quantum matter defined by Sachdev-Ye-Kitaev dots coupled via random one-body hopping. Within the framework of Schwarzian field theory, we identify a zero-temperature quantum phase transition between an insulating phase at weak and a metallic phase at strong hopping. The critical hopping strength scales inversely with the number of degrees of freedom on the dots. The increase of temperature out of either phase induces a crossover into a regime of strange metallic behavior.

摘要

我们考虑由 Sachdev-Ye-Kitaev 点通过随机单粒子跳跃耦合定义的颗粒量子物质。在 Schwarzian 场论的框架内，我们在弱跳跃和强跳跃之间识别出一个绝缘相和金属相之间的零温量子相变。临界跳跃强度与点上的自由度数量成反比。无论是在哪个相中，温度的升高都会导致进入奇异金属行为的过渡区。