Few-fermion resonant tunneling and underbarrier trapping in asymmetric potentials

• URL: http://arxiv.org/abs/2412.03495v1
• Date: Wed, 04 Dec 2024 17:36:07 GMT
• Title: Few-fermion resonant tunneling and underbarrier trapping in asymmetric potentials
• Authors: Elvira Bilokon, Valeriia Bilokon, Dusty R. Lindberg, Andrii Sotnikov, Lev Kaplan, Denys I. Bondar,
• Abstract summary: We investigate the tunneling dynamics of few-fermion systems in lattices under asymmetric external potentials. Our results may be applied to the design of nanoscale devices with tailored transport properties, such as diodes and memristors.
• Score: 0.0
• License:
• Abstract: We investigate the tunneling dynamics of few-fermion systems in lattices under asymmetric external potentials - a setup realizable in experiments with ultracold atoms in optical lattices. We first prove that noninteracting fermions exhibit symmetric tunneling probabilities regardless of the barrier's orientation. Then, we demonstrate that inter-particle interactions break this symmetry and lead to pronounced asymmetric tunneling. Remarkably, such a simple system exhibits an unexpectedly diverse range of dynamical behaviors, offering insights into the interplay among fermion-fermion interactions, barrier asymmetry, and spin configurations. We explore the dependence of tunneling behavior on the initial spin configurations: spin-singlet states preserve tunneling symmetry, while spin-triplet 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 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.

Related papers

• Nonstandard Hubbard model and electron pairing [0.0]
  We present a non-standard Hubbard model applicable to arbitrary single-particle potential profiles and inter-particle interactions. Our investigation demonstrates that long-range inter-particle interactions can induce a novel mechanism for repulsive particle pairing. These findings carry significant implications for various phenomena, including the formation of flat bands, the emergence of superconductivity in twisted bilayer graphene, and the possibility of a novel metal-insulator transition.
  arXiv  Detail & Related papers  (2023-07-31T15:01:16Z)
• NMR investigations of Dynamical Tunneling in Spin Systems [0.0]
  In chaotic Hamiltonian systems, dynamical tunneling refers to quantum tunneling between states whose classical limit correspond to symmetry-related regular regions separated by a chaotic zone. Here, an experimental realization of dynamical tunneling in spin systems is reported using nuclear magnetic resonance (NMR) architecture.
  arXiv  Detail & Related papers  (2022-12-23T14:07:07Z)
• Probing the symmetry breaking of a light--matter system by an ancillary qubit [50.591267188664666]
  Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
  arXiv  Detail & Related papers  (2022-09-13T06:14:08Z)
• Noise-resilient Edge Modes on a Chain of Superconducting Qubits [103.93329374521808]
  Inherent symmetry of a quantum system may protect its otherwise fragile states. We implement the one-dimensional kicked Ising model which exhibits non-local Majorana edge modes (MEMs) with $mathbbZ$ parity symmetry. MEMs are found to be resilient against certain symmetry-breaking noise owing to a prethermalization mechanism.
  arXiv  Detail & Related papers  (2022-04-24T22:34:15Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Asymmetric Tunneling of Bose-Einstein Condensates [0.0]
  Landau argued that, for single particle systems in 1D, tunneling probability remains the same for a particle incident from the left or the right of a barrier. We show this breaking of the left-right tunneling symmetry for Bose-Einstein condensates in 1D, modelled by the Gross-Pitaevskii equation (GPE) We conclude by suggesting applications of the phenomena to design atomtronic diodes, synthetic gauge fields, Maxwell's demons, and black-hole analogues.
  arXiv  Detail & Related papers  (2021-10-28T16:59:28Z)
• Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
  Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
  arXiv  Detail & Related papers  (2021-07-23T07:30:57Z)
• Fano interference in quantum resonances from angle-resolved elastic scattering [62.997667081978825]
  We show that probing the angular dependence of the cross section allows us to unveil asymmetric Fano profiles in a single channel shape resonance. We observe a shift in the peak of the resonance profile in the elastic collisions between metastable helium and deuterium molecules.
  arXiv  Detail & Related papers  (2021-05-12T20:41:25Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• Hallmarks of tunneling dynamics with broken reflective symmetry [0.0]
  We study features of tunneling dynamics in an exactly-solvable model of N=4 quantum mechanics with a multi-well potential and broken reflective symmetry. Taking the partial localization and the coherent tunneling destruction as basic examples, we indicate main advantages of using isospectral exactly-solvable Hamiltonians in studies quantum mechanical systems with two- and three-well potentials.
  arXiv  Detail & Related papers  (2020-12-22T09:11:04Z)
• Controlling directed atomic motion and second-order tunneling of a spin-orbit-coupled atom in optical lattices [8.118975693510722]
  We show that the spin-orbit (SO) coupling adds some new results to the tunneling dynamics in both multiphoton resonance and far-off-resonance parameter regimes. These results may be relevant to potential applications such as spin-based quantum information processing and design of novel spintronics devices.
  arXiv  Detail & Related papers  (2020-11-03T00:54:03Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.