Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot
We show that the axial symmetry of the Bychkov–Rashba interaction can be exploited to produce electron spin-flip in a circular quantum dot, without lifting the time reversal symmetry. In order to elucidate this effect, we consider ballistic electron transmission through a two-dimensional circular bi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/12/12/2043 |
| _version_ | 1797545159062192128 |
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| author | Konstantin Pichugin Antonio Puente Rashid Nazmitdinov |
| author_facet | Konstantin Pichugin Antonio Puente Rashid Nazmitdinov |
| author_sort | Konstantin Pichugin |
| collection | DOAJ |
| description | We show that the axial symmetry of the Bychkov–Rashba interaction can be exploited to produce electron spin-flip in a circular quantum dot, without lifting the time reversal symmetry. In order to elucidate this effect, we consider ballistic electron transmission through a two-dimensional circular billiard coupled to two one-dimensional electrodes. Using the tight-binding approximation, we derive the scattering matrix and the effective Hamiltonian for the considered system. Within this approach, we found the conditions for the optimal realization of this effect in the transport properties of the quantum dot. Numerical analysis of the system, extended to the case of two-dimensional electrodes, confirms our findings. The relatively strong quantization of the quantum dot can make this effect robust against the temperature effects. |
| first_indexed | 2024-03-10T14:11:31Z |
| format | Article |
| id | doaj.art-397bb407782b4117b1ae575cbede0c0f |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T14:11:31Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-397bb407782b4117b1ae575cbede0c0f2023-11-21T00:08:41ZengMDPI AGSymmetry2073-89942020-12-011212204310.3390/sym12122043Kramers Degeneracy and Spin Inversion in a Lateral Quantum DotKonstantin Pichugin0Antonio Puente1Rashid Nazmitdinov2Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, RussiaDepartament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, SpainBogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, RussiaWe show that the axial symmetry of the Bychkov–Rashba interaction can be exploited to produce electron spin-flip in a circular quantum dot, without lifting the time reversal symmetry. In order to elucidate this effect, we consider ballistic electron transmission through a two-dimensional circular billiard coupled to two one-dimensional electrodes. Using the tight-binding approximation, we derive the scattering matrix and the effective Hamiltonian for the considered system. Within this approach, we found the conditions for the optimal realization of this effect in the transport properties of the quantum dot. Numerical analysis of the system, extended to the case of two-dimensional electrodes, confirms our findings. The relatively strong quantization of the quantum dot can make this effect robust against the temperature effects.https://www.mdpi.com/2073-8994/12/12/2043quantum dotKramers degeneracyspin-orbit interactiontight-binding approach |
| spellingShingle | Konstantin Pichugin Antonio Puente Rashid Nazmitdinov Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot Symmetry quantum dot Kramers degeneracy spin-orbit interaction tight-binding approach |
| title | Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot |
| title_full | Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot |
| title_fullStr | Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot |
| title_full_unstemmed | Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot |
| title_short | Kramers Degeneracy and Spin Inversion in a Lateral Quantum Dot |
| title_sort | kramers degeneracy and spin inversion in a lateral quantum dot |
| topic | quantum dot Kramers degeneracy spin-orbit interaction tight-binding approach |
| url | https://www.mdpi.com/2073-8994/12/12/2043 |
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