| Disorder in interacting quasi-one-dimensional systems: Flat and dispersive bands | |
| Liang, Mi-Ji1; Yang, Yong-Feng1; Cheng, Chen1; Mondaini, Rubem2 | |
| 2023-07-15 | |
| Source Publication | PHYSICAL REVIEW B Impact Factor & Quartile |
| ISSN | 2469-9950 |
| Volume | 108Issue:3 |
| Abstract | We use the density-matrix renormalization group method to investigate the superconductor-insulator transition (SIT) in disordered quasi-one-dimensional systems. Focusing on the case of an interacting spinful Hamiltonian at quarter filling, we contrast the differences arising in the SIT when the parent noninteracting model features flat or dispersive bands. Furthermore, we unveil the critical disorder amplitude that triggers insulating behavior by comparing disorder distributions that preserve or not SU(2) symmetry. While scaling analysis suggests the transition be of a Berezinskii-Kosterlitz-Thouless type for all models (two lattices and two disorder types), only in the flat-band model with Zeeman-like disorder is the critical disorder nonvanishing. In this sense, the flat-band structure does strengthen superconductivity in the presence of attractive interactions. For both flat- and dispersive-band models, (i) in the presence of SU(2)-symmetric random chemical potentials, the disorder-induced transition is from superconductor to insulator of singlet pairs; (ii) for the Zeeman-type disorder, the transition is from superconductor to insulator of unpaired fermions. In all cases, our numerical results suggest no intermediate disorder-driven metallic phase. © 2023 American Physical Society |
| Keyword | Statistical mechanics Band model Density matrix renormalization group methods Dispersive band Flat band Modeling features Noninteracting Quarter filling Quasi-one-dimensional systems Scaling analysis Superconductor insulator transitions |
| Publisher | American Physical Society |
| DOI | 10.1103/PhysRevB.108.035131 |
| Indexed By | EI |
| Language | 英语 |
| EI Accession Number | 20233014448712 |
| EI Keywords | Superconducting materials |
| EI Classification Number | 708.3 Superconducting Materials ; 922.2 Mathematical Statistics ; 931.1 Mechanics |
| Original Document Type | Journal article (JA) |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.lzu.edu.cn/handle/262010/532227 |
| Collection | 兰州大学 |
| Affiliation | 1.Key Laboratory of Quantum Theory and Applications of MoE, Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, Gansu, Lanzhou; 730000, China; 2.Beijing Computational Science Research Center, Beijing; 100193, China |
| First Author Affilication | Lanzhou University |
| Recommended Citation GB/T 7714 | Liang, Mi-Ji,Yang, Yong-Feng,Cheng, Chen,et al. Disorder in interacting quasi-one-dimensional systems: Flat and dispersive bands[J]. PHYSICAL REVIEW B,2023,108(3). |
| APA | Liang, Mi-Ji,Yang, Yong-Feng,Cheng, Chen,&Mondaini, Rubem.(2023).Disorder in interacting quasi-one-dimensional systems: Flat and dispersive bands.PHYSICAL REVIEW B,108(3). |
| MLA | Liang, Mi-Ji,et al."Disorder in interacting quasi-one-dimensional systems: Flat and dispersive bands".PHYSICAL REVIEW B 108.3(2023). |
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