Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915249110646784 |
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| author | Hong, Yuan Fu, Zhen-Guo Chen, Zhou-Wei-Yu Chi, Feng Wang, Zhigang Zhang, Wei Zhang, Ping |
| author_facet | Hong, Yuan Fu, Zhen-Guo Chen, Zhou-Wei-Yu Chi, Feng Wang, Zhigang Zhang, Wei Zhang, Ping |
| contents | We study the quantum transport in double quantum dots (DQD) sandwiched between surfaces of topological insulator (TI) Bi$_{2}$Te$_{3}$, which possess strong spin-orbit coupling (SOC) and $^{d}$C$_{3v}$ double group symmetry. Different from the spin-conserved case with two-dimensional electron gas (2DEG) electrodes, the conductance displays a universal scaling relation for different Fermi energy associated with the topological nature/linear dispersion of topological surface states. The interplay between direct inter-dot tunneling and surface state mediated interaction leads to tunable Dicke and Fano effects with changing the inter-dot distance. We propose nano-rulers with different measurement range and resolution based on the Fano $q$-factor. Furthermore, when applying an in-plane Zeeman field, a crossover from a double-peak shape to a quad-peak shape in conductance curve appears. Moreover, the rotational symmetry of the system could also be revealed from the conductance pattern. Our findings contribute to a better understanding of the quantum transport in the presence of electrode's SOC topological states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_11165 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators Hong, Yuan Fu, Zhen-Guo Chen, Zhou-Wei-Yu Chi, Feng Wang, Zhigang Zhang, Wei Zhang, Ping Mesoscale and Nanoscale Physics We study the quantum transport in double quantum dots (DQD) sandwiched between surfaces of topological insulator (TI) Bi$_{2}$Te$_{3}$, which possess strong spin-orbit coupling (SOC) and $^{d}$C$_{3v}$ double group symmetry. Different from the spin-conserved case with two-dimensional electron gas (2DEG) electrodes, the conductance displays a universal scaling relation for different Fermi energy associated with the topological nature/linear dispersion of topological surface states. The interplay between direct inter-dot tunneling and surface state mediated interaction leads to tunable Dicke and Fano effects with changing the inter-dot distance. We propose nano-rulers with different measurement range and resolution based on the Fano $q$-factor. Furthermore, when applying an in-plane Zeeman field, a crossover from a double-peak shape to a quad-peak shape in conductance curve appears. Moreover, the rotational symmetry of the system could also be revealed from the conductance pattern. Our findings contribute to a better understanding of the quantum transport in the presence of electrode's SOC topological states. |
| title | Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.11165 |