{"title":"来自单分子磁体阵列的时间晶体","authors":"Subhajit Sarkar, Yonatan Dubi","doi":"arxiv-2409.10816","DOIUrl":null,"url":null,"abstract":"Time crystals, a unique non-equilibrium quantum phenomenon with promising\napplications in current quantum technologies, mark a significant advance in\nquantum mechanics. Although traditionally studied in atom-cavity and optical\nlattice systems, pursuing alternative nanoscale platforms for time crystals is\ncrucial. Here we theoretically predict discrete time-crystals in a periodically\ndriven molecular magnet array, modeled by a spin-S Heisenberg Hamiltonian with\nsignificant quadratic anisotropy, taken with realistic and experimentally\nrelevant physical parameters. Surprisingly, we find that the time-crystal\nresponse frequency correlates with the energy levels of the individual magnets\nand is essentially independent of the exchange coupling. The latter is\nunexpectedly manifested through a pulse-like oscillation in the magnetization\nenvelope, signaling a many-body response. These results show that molecular\nmagnets can be a rich platform for studying time-crystalline behavior and\npossibly other out-of-equilibrium quantum many-body dynamics.","PeriodicalId":501226,"journal":{"name":"arXiv - PHYS - Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Time Crystals from single-molecule magnet arrays\",\"authors\":\"Subhajit Sarkar, Yonatan Dubi\",\"doi\":\"arxiv-2409.10816\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Time crystals, a unique non-equilibrium quantum phenomenon with promising\\napplications in current quantum technologies, mark a significant advance in\\nquantum mechanics. Although traditionally studied in atom-cavity and optical\\nlattice systems, pursuing alternative nanoscale platforms for time crystals is\\ncrucial. Here we theoretically predict discrete time-crystals in a periodically\\ndriven molecular magnet array, modeled by a spin-S Heisenberg Hamiltonian with\\nsignificant quadratic anisotropy, taken with realistic and experimentally\\nrelevant physical parameters. Surprisingly, we find that the time-crystal\\nresponse frequency correlates with the energy levels of the individual magnets\\nand is essentially independent of the exchange coupling. The latter is\\nunexpectedly manifested through a pulse-like oscillation in the magnetization\\nenvelope, signaling a many-body response. These results show that molecular\\nmagnets can be a rich platform for studying time-crystalline behavior and\\npossibly other out-of-equilibrium quantum many-body dynamics.\",\"PeriodicalId\":501226,\"journal\":{\"name\":\"arXiv - PHYS - Quantum Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-09-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - PHYS - Quantum Physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2409.10816\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Quantum Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.10816","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Time crystals, a unique non-equilibrium quantum phenomenon with promising
applications in current quantum technologies, mark a significant advance in
quantum mechanics. Although traditionally studied in atom-cavity and optical
lattice systems, pursuing alternative nanoscale platforms for time crystals is
crucial. Here we theoretically predict discrete time-crystals in a periodically
driven molecular magnet array, modeled by a spin-S Heisenberg Hamiltonian with
significant quadratic anisotropy, taken with realistic and experimentally
relevant physical parameters. Surprisingly, we find that the time-crystal
response frequency correlates with the energy levels of the individual magnets
and is essentially independent of the exchange coupling. The latter is
unexpectedly manifested through a pulse-like oscillation in the magnetization
envelope, signaling a many-body response. These results show that molecular
magnets can be a rich platform for studying time-crystalline behavior and
possibly other out-of-equilibrium quantum many-body dynamics.