Few-fermion resonant tunneling and underbarrier trapping in asymmetric potentials
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911023667085312 |
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| author | Bilokon, Elvira Bilokon, Valeriia Lindberg, Dusty R. Kaplan, Lev Sotnikov, Andrii Bondar, Denys I. |
| author_facet | Bilokon, Elvira Bilokon, Valeriia Lindberg, Dusty R. Kaplan, Lev Sotnikov, Andrii Bondar, Denys I. |
| contents | Understanding quantum tunneling in many-body systems is crucial for advancing quantum technologies and nanoscale device design. Despite extensive studies of quantum tunneling, the role of interactions in determining directional transport through asymmetric barriers in discrete quantum systems remains unclear. Here we show that noninteracting fermions exhibit symmetric tunneling probabilities regardless of barrier orientation, while inter-particle interactions break this symmetry and create pronounced asymmetric tunneling behavior. We explore the dependence of tunneling behavior on the initial spin configurations of two spin-1/2 fermions: spin-triplet states preserve tunneling symmetry, while spin-singlet states show strong asymmetry. We identify regimes where interactions mediate tunneling through under-barrier resonant trapping and enhance tunneling via many-body resonant tunneling -- a phenomenon arising solely from inter-particle interactions and being fundamentally different from traditional single-particle resonant tunneling. Our results may be applied to the design of nanoscale devices with tailored transport properties, such as diodes and memristors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03495 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Few-fermion resonant tunneling and underbarrier trapping in asymmetric potentials Bilokon, Elvira Bilokon, Valeriia Lindberg, Dusty R. Kaplan, Lev Sotnikov, Andrii Bondar, Denys I. Quantum Physics Strongly Correlated Electrons Understanding quantum tunneling in many-body systems is crucial for advancing quantum technologies and nanoscale device design. Despite extensive studies of quantum tunneling, the role of interactions in determining directional transport through asymmetric barriers in discrete quantum systems remains unclear. Here we show that noninteracting fermions exhibit symmetric tunneling probabilities regardless of barrier orientation, while inter-particle interactions break this symmetry and create pronounced asymmetric tunneling behavior. We explore the dependence of tunneling behavior on the initial spin configurations of two spin-1/2 fermions: spin-triplet states preserve tunneling symmetry, while spin-singlet states show strong asymmetry. We identify regimes where interactions mediate tunneling through under-barrier resonant trapping and enhance tunneling via many-body resonant tunneling -- a phenomenon arising solely from inter-particle interactions and being fundamentally different from traditional single-particle resonant tunneling. Our results may be applied to the design of nanoscale devices with tailored transport properties, such as diodes and memristors. |
| title | Few-fermion resonant tunneling and underbarrier trapping in asymmetric potentials |
| topic | Quantum Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.03495 |