Super-ballistic transport in an open quantum ring
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866929413774376960 |
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| author | Patra, Moumita Agarwalla, Bijay Kumar Maiti, Santanu K. |
| author_facet | Patra, Moumita Agarwalla, Bijay Kumar Maiti, Santanu K. |
| contents | When the degeneracies of the ring-Hamiltonian are removed by the asymmetric ring-to-electrodes configuration for an open quantum ring (OQR), the overall junction transmission function exhibits fano-type antiresonance, resulting a net circular current appears within the channel, that is the ring around the degenerate energy levels of the ring-Hamiltonian. We investigate the system size scaling properties of the channel conductance and the overall junction conductance of an OQR. Ballistic transport is the unhindered flow of a charge carrier within a conductor. Here we find beyond-ballistic transport near both the degenerate and non-degenerate eigenenergies of the ring-Hamiltonian, depending on the ring-to-lead configuration. This is a purely OQR phenomenon associated with the quantum interference effect between two counter-propagating electronic waves having nearly equal and opposite momenta. Thus there is no equivalent phenomenon in open quantum junctions with linear channel. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_05830 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Super-ballistic transport in an open quantum ring Patra, Moumita Agarwalla, Bijay Kumar Maiti, Santanu K. Mesoscale and Nanoscale Physics When the degeneracies of the ring-Hamiltonian are removed by the asymmetric ring-to-electrodes configuration for an open quantum ring (OQR), the overall junction transmission function exhibits fano-type antiresonance, resulting a net circular current appears within the channel, that is the ring around the degenerate energy levels of the ring-Hamiltonian. We investigate the system size scaling properties of the channel conductance and the overall junction conductance of an OQR. Ballistic transport is the unhindered flow of a charge carrier within a conductor. Here we find beyond-ballistic transport near both the degenerate and non-degenerate eigenenergies of the ring-Hamiltonian, depending on the ring-to-lead configuration. This is a purely OQR phenomenon associated with the quantum interference effect between two counter-propagating electronic waves having nearly equal and opposite momenta. Thus there is no equivalent phenomenon in open quantum junctions with linear channel. |
| title | Super-ballistic transport in an open quantum ring |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.05830 |