Berry phase jumps and giant nonreciprocity in Dirac quantum dots
We predict that a strong nonreciprocity in the resonance spectra of Dirac quantum dots can be induced by the Berry phase. The nonreciprocity arises in relatively weak magnetic fields and is manifest in anomalously large field-induced splittings of quantum dot resonances which are degenerate at B=0 d...
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| Format: | Article |
| Language: | English |
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American Physical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/108613 https://orcid.org/0000-0002-3023-396X https://orcid.org/0000-0002-4268-731X |
| _version_ | 1826209608774975488 |
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| author | Rodriguez Nieva, Joaquin Francisco Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Rodriguez Nieva, Joaquin Francisco Levitov, Leonid |
| author_sort | Rodriguez Nieva, Joaquin Francisco |
| collection | MIT |
| description | We predict that a strong nonreciprocity in the resonance spectra of Dirac quantum dots can be induced by the Berry phase. The nonreciprocity arises in relatively weak magnetic fields and is manifest in anomalously large field-induced splittings of quantum dot resonances which are degenerate at B=0 due to time-reversal symmetry. This exotic behavior, which is governed by field-induced jumps in the Berry phase of confined electronic states, is unique to quantum dots in Dirac materials and is absent in conventional quantum dots. The effect is strong for gapless Dirac particles and can overwhelm the B-induced orbital and Zeeman splittings. A finite Dirac mass suppresses the effect. The nonreciprocity, predicted for generic two-dimensional Dirac materials, is accessible through Faraday and Kerr optical rotation measurements and scanning tunneling spectroscopy. |
| first_indexed | 2024-09-23T14:25:10Z |
| format | Article |
| id | mit-1721.1/108613 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:25:10Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1086132022-09-29T09:22:04Z Berry phase jumps and giant nonreciprocity in Dirac quantum dots Rodriguez Nieva, Joaquin Francisco Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Rodriguez Nieva, Joaquin Francisco Levitov, Leonid We predict that a strong nonreciprocity in the resonance spectra of Dirac quantum dots can be induced by the Berry phase. The nonreciprocity arises in relatively weak magnetic fields and is manifest in anomalously large field-induced splittings of quantum dot resonances which are degenerate at B=0 due to time-reversal symmetry. This exotic behavior, which is governed by field-induced jumps in the Berry phase of confined electronic states, is unique to quantum dots in Dirac materials and is absent in conventional quantum dots. The effect is strong for gapless Dirac particles and can overwhelm the B-induced orbital and Zeeman splittings. A finite Dirac mass suppresses the effect. The nonreciprocity, predicted for generic two-dimensional Dirac materials, is accessible through Faraday and Kerr optical rotation measurements and scanning tunneling spectroscopy. National Science Foundation (Grant DMR-1004147) United States. Dept. of Energy. Office of Basic Energy Sciences (Massachusetts Institute of Technology. Energy Frontier Research Center for Excitonics. Award DE-SC0001088) 2017-05-02T19:41:27Z 2017-05-02T19:41:27Z 2016-12 2016-05 2016-12-06T23:00:04Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/108613 Rodriguez-Nieva, Joaquin F., and Leonid S. Levitov. “Berry Phase Jumps and Giant Nonreciprocity in Dirac Quantum Dots.” Physical Review B 94.23 (2016): n. pag. © 2016 American Physical Society https://orcid.org/0000-0002-3023-396X https://orcid.org/0000-0002-4268-731X en http://dx.doi.org/10.1103/PhysRevB.94.235406 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Rodriguez Nieva, Joaquin Francisco Levitov, Leonid Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title | Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title_full | Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title_fullStr | Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title_full_unstemmed | Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title_short | Berry phase jumps and giant nonreciprocity in Dirac quantum dots |
| title_sort | berry phase jumps and giant nonreciprocity in dirac quantum dots |
| url | http://hdl.handle.net/1721.1/108613 https://orcid.org/0000-0002-3023-396X https://orcid.org/0000-0002-4268-731X |
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