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Sitek A, Ţolea M, Niţă M, Serra L, Gudmundsson V, Manolescu A. In-gap corner states in core-shell polygonal quantum rings. Sci Rep 2017; 7:40197. [PMID: 28071750 PMCID: PMC5223208 DOI: 10.1038/srep40197] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 12/02/2016] [Indexed: 11/20/2022] Open
Abstract
We study Coulomb interacting electrons confined in polygonal quantum rings. We focus on the interplay of localization at the polygon corners and Coulomb repulsion. Remarkably, the Coulomb repulsion allows the formation of in-gap states, i.e., corner-localized states of electron pairs or clusters shifted to energies that were forbidden for non-interacting electrons, but below the energies of corner-side-localized states. We specify conditions allowing optical excitation to those states.
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Affiliation(s)
- Anna Sitek
- Science Institute, University of Iceland, Reykjavik, IS-107, Iceland.,School of Science and Engineering, Reykjavik University, Reykjavik, IS-101, Iceland.,Department of Theoretical Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, 50-370, Poland
| | - Mugurel Ţolea
- National Institute of Materials Physics, Bucharest-Magurele, P.O. Box MG-7, Romania
| | - Marian Niţă
- National Institute of Materials Physics, Bucharest-Magurele, P.O. Box MG-7, Romania
| | - Llorenç Serra
- Institute of Interdisciplinary Physics and Complex Systems IFISC (CSIC-UIB), Palma de Mallorca, E-07122, Spain.,Department of Physics, University of the Balearic Islands, Palma de Mallorca, E-07122, Spain
| | - Vidar Gudmundsson
- Science Institute, University of Iceland, Reykjavik, IS-107, Iceland
| | - Andrei Manolescu
- School of Science and Engineering, Reykjavik University, Reykjavik, IS-101, Iceland
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A novel device principle for nanoelectronics. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2002. [DOI: 10.1016/s0928-4931(01)00435-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Xu H. Magnetoconductance oscillations in periodically modulated quasi-one-dimensional electron systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:16623-16626. [PMID: 9981064 DOI: 10.1103/physrevb.52.16623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Xu H. Electron transport through one-dimensional lateral surface superlattices in magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:5803-5812. [PMID: 9981770 DOI: 10.1103/physrevb.52.5803] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xu H. Conductance fluctuations in periodic antidot arrays. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:12254-12257. [PMID: 9975383 DOI: 10.1103/physrevb.50.12254] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xu H. Scattering-matrix method for ballistic electron transport: Theory and an application to quantum antidot arrays. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:8469-8478. [PMID: 9974865 DOI: 10.1103/physrevb.50.8469] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xu H. Theory of ballistic transport through a 3D-1D-3D quantum system. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:8878-8881. [PMID: 10007106 DOI: 10.1103/physrevb.48.8878] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Xu H. Theory of nonlinear ballistic transport in quasi-one-dimensional constrictions. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:15630-15637. [PMID: 10005955 DOI: 10.1103/physrevb.47.15630] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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