Quantum Coulomb glass on the Bethe lattice

被引:2
作者
Lovas, Izabella [1 ,2 ]
Kiss, Annamaria [3 ,4 ]
Moca, Catalin Pascu [5 ,6 ,7 ]
Zarand, Gergely [5 ,7 ]
机构
[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[2] Tech Univ Munich, Inst Adv Study, D-85748 Garching, Germany
[3] Munich Ctr Quantum Sci & Technol MCQST, Schellingstr 4, D-80799 Munich, Germany
[4] Wigner Res Ctr Phys, Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary
[5] Budapest Univ Technol & Econ, Inst Phys, Dept Theoret Phys, Muegyet Rkp 3, H-1111 Budapest, Hungary
[6] Univ Oradea, Dept Phys, Oradea 410087, Romania
[7] Budapest Univ Technol & Econ, MTA BME Quantum Dynam & Correlat Res Grp, Muegyet Rkp 3, H-1111 Budapest, Hungary
来源
PHYSICAL REVIEW RESEARCH | 2022年 / 4卷 / 02期
基金
欧洲研究理事会;
关键词
MEAN-FIELD THEORY; ANDERSON LOCALIZATION; SPIN-GLASSES; SYSTEMS; GAP;
D O I
10.1103/PhysRevResearch.4.023067
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the Coulomb glass emerging from the interplay of strong interactions and disorder in a model of spinless fermions on the Bethe lattice. In the infinite coordination number limit, strong interactions induce a metallic Coulomb glass phase with a pseudogap structure at the Fermi energy. Quantum and thermal fluctuations both melt this glass and induce a disordered quantum liquid phase. We combine self-consistent diagrammatic perturbation theory with continuous time quantum Monte-Carlo simulations to obtain the complete phase diagram of the electron glass and to characterize its dynamical properties in the quantum liquid, as well as in the replica symmetry broken glassy phase. Tunneling spectra display an Efros-Shklovskii pseudogap upon decreasing temperatures, but the density of states remains finite at the Fermi energy due to residual quantum fluctuations. Our results bear relevance to the metallic glass phase observed in Si inversion layers.
引用
收藏
页数:14
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