Tunable non-Fermi liquid phase from coupling to two-level systems
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866917688989712384 |
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| author | Bashan, Noga Tulipman, Evyatar Schmalian, Jörg Berg, Erez |
| author_facet | Bashan, Noga Tulipman, Evyatar Schmalian, Jörg Berg, Erez |
| contents | 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. Beyond a critical coupling strength, the TLSs freeze and Fermi-liquid behavior is restored. Our results are valid for generic space dimensions $d>1$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_07768 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Tunable non-Fermi liquid phase from coupling to two-level systems Bashan, Noga Tulipman, Evyatar Schmalian, Jörg Berg, Erez Strongly Correlated Electrons Disordered Systems and Neural Networks Statistical Mechanics 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. Beyond a critical coupling strength, the TLSs freeze and Fermi-liquid behavior is restored. Our results are valid for generic space dimensions $d>1$. |
| title | Tunable non-Fermi liquid phase from coupling to two-level systems |
| topic | Strongly Correlated Electrons Disordered Systems and Neural Networks Statistical Mechanics |
| url | https://arxiv.org/abs/2310.07768 |