Persistent dark states in anisotropic central spin models
| Autor: | Pieter W. Claeys, Tamiro Villazon, Anatoli Polkovnikov, Anushya Chandran, Mohit Pandey |
|---|---|
| Přispěvatelé: | Apollo - University of Cambridge Repository, Claeys, Pieter [0000-0001-7150-8459] |
| Rok vydání: | 2020 |
| Předmět: |
639/766/119
lcsh:Medicine FOS: Physical sciences 01 natural sciences 5108 Quantum Physics 010305 fluids & plasmas 639/766/530 639/766/483 Condensed Matter - Strongly Correlated Electrons Quantum mechanics 0103 physical sciences lcsh:Science 010306 general physics Eigenstate thermalization hypothesis Condensed Matter - Statistical Mechanics Thermal equilibrium Physics Quantum Physics Mesoscopic physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Statistical Mechanics (cond-mat.stat-mech) lcsh:R Relaxation (NMR) 1. No poverty article Nonlinear Sciences - Chaotic Dynamics Thermalisation Quantum dot Qubit lcsh:Q Large deviations theory Chaotic Dynamics (nlin.CD) Quantum Physics (quant-ph) 51 Physical Sciences |
| Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-16 (2020) |
| DOI: | 10.48550/arxiv.2005.13556 |
| Popis: | Long-lived dark states, in which an experimentally accessible qubit is not in thermal equilibrium with a surrounding spin bath, are pervasive in solid-state systems. We explain the ubiquity of dark states in a large class of inhomogenous central spin models using the proximity to integrable lines with exact dark eigenstates. At numerically accessible sizes, dark states persist as eigenstates at large deviations from integrability, and the qubit retains memory of its initial polarization at long times. Although the eigenstates of the system are chaotic, exhibiting exponential sensitivity to small perturbations, they do not satisfy the eigenstate thermalization hypothesis. Rather, we predict long relaxation times that increase exponentially with system size. We propose that this intermediate chaotic but non-ergodic regime characterizes mesoscopic quantum dot and diamond defect systems, as we see no numerical tendency towards conventional thermalization with a finite relaxation time. Comment: 14 pages, 15 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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