Tunable Non-Fermi Liquid Phase from Coupling to Two-Level Systems

被引：5

作者：

Bashan, Noga ^{[1
]}

Tulipman, Evyatar ^{[1
]}

Schmalian, Joerg ^{[2
,3
]}

Berg, Erez ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[2] Karlsruher Inst Technol, Inst Theorie Kondensierten Mat, D-76131 Karlsruhe, Germany

[3] Karlsruher Inst Technol, Inst Quantenmaterialien & Technol, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2024年 / 132卷 / 23期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

QUASI-PARTICLE STATES; QUANTUM CRITICALITY; 2-STATE SYSTEM; TEMPERATURE; ORDER; SUPERCONDUCTIVITY; FLUCTUATIONS; DYNAMICS; BEHAVIOR; RESISTIVITY;

D O I：

10.1103/PhysRevLett.132.236501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a controlled large-N theory of electrons coupled to dynamical two-level systems (TLSs) via spatially random interactions. Such a physical situation arises when electrons scatter off low-energy excitations in a metallic glass, such as a charge or stripe glass. Our theory is governed by a non-Gaussian saddle point, which maps to the celebrated spin-boson model. By tuning the coupling strength we find that the model crosses over from a Fermi liquid at weak coupling to an extended region of non-Fermi liquid behavior at strong coupling, and realizes a marginal Fermi liquid at the crossover. Our results are valid for generic space dimensions d > 1.

引用

页数：8

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