Anomalous chiral edge states in spin-1 Dirac quantum dots
We uncover an unexpected family of in-gap chiral edge states in noninverted spin-1 Dirac quantum dots. The system represents a topologically trivial confinement configuration where such edge states are not expected according to the conventional wisdom. In particular, for a massive type of confining...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-01-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.013062 |
| _version_ | 1797211630385233920 |
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| author | Hong-Ya Xu Ying-Cheng Lai |
| author_facet | Hong-Ya Xu Ying-Cheng Lai |
| author_sort | Hong-Ya Xu |
| collection | DOAJ |
| description | We uncover an unexpected family of in-gap chiral edge states in noninverted spin-1 Dirac quantum dots. The system represents a topologically trivial confinement configuration where such edge states are not expected according to the conventional wisdom. In particular, for a massive type of confining potential, two distinct situations can arise: with or without mass sign change, corresponding to a quantum dot with or without band inversion, respectively. The former case is conventional, where topologically protected chiral edge modes can arise in the gap. For the latter, contrary to the belief that there should be no one-way current-carrying edge channels, we find the surprising emergence of such edge states and the spin-1 analog of Majorana modes. These states are strikingly robust and immune to backscattering. In the presence of a magnetic field, the edge states result in peculiar Fock-Darwin states originated from Landau-level confinement. The unexpected phenomenon is also validated in systems with bulk-topology regularization through (1) a properly regularized continuum model and (2) an experimentally accessible tight-binding dice lattice system. |
| first_indexed | 2024-04-24T10:29:33Z |
| format | Article |
| id | doaj.art-c965b01d259c4cd9bfde89e5f514f53e |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:29:33Z |
| publishDate | 2020-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-c965b01d259c4cd9bfde89e5f514f53e2024-04-12T16:48:52ZengAmerican Physical SocietyPhysical Review Research2643-15642020-01-012101306210.1103/PhysRevResearch.2.013062Anomalous chiral edge states in spin-1 Dirac quantum dotsHong-Ya XuYing-Cheng LaiWe uncover an unexpected family of in-gap chiral edge states in noninverted spin-1 Dirac quantum dots. The system represents a topologically trivial confinement configuration where such edge states are not expected according to the conventional wisdom. In particular, for a massive type of confining potential, two distinct situations can arise: with or without mass sign change, corresponding to a quantum dot with or without band inversion, respectively. The former case is conventional, where topologically protected chiral edge modes can arise in the gap. For the latter, contrary to the belief that there should be no one-way current-carrying edge channels, we find the surprising emergence of such edge states and the spin-1 analog of Majorana modes. These states are strikingly robust and immune to backscattering. In the presence of a magnetic field, the edge states result in peculiar Fock-Darwin states originated from Landau-level confinement. The unexpected phenomenon is also validated in systems with bulk-topology regularization through (1) a properly regularized continuum model and (2) an experimentally accessible tight-binding dice lattice system.http://doi.org/10.1103/PhysRevResearch.2.013062 |
| spellingShingle | Hong-Ya Xu Ying-Cheng Lai Anomalous chiral edge states in spin-1 Dirac quantum dots Physical Review Research |
| title | Anomalous chiral edge states in spin-1 Dirac quantum dots |
| title_full | Anomalous chiral edge states in spin-1 Dirac quantum dots |
| title_fullStr | Anomalous chiral edge states in spin-1 Dirac quantum dots |
| title_full_unstemmed | Anomalous chiral edge states in spin-1 Dirac quantum dots |
| title_short | Anomalous chiral edge states in spin-1 Dirac quantum dots |
| title_sort | anomalous chiral edge states in spin 1 dirac quantum dots |
| url | http://doi.org/10.1103/PhysRevResearch.2.013062 |
| work_keys_str_mv | AT hongyaxu anomalouschiraledgestatesinspin1diracquantumdots AT yingchenglai anomalouschiraledgestatesinspin1diracquantumdots |