Fermionic transport through a driven quantum point contact: breakdown of Floquet thermalization beyond a critical driving frequency

• URL: http://arxiv.org/abs/2411.04982v2
• Date: Tue, 19 Nov 2024 14:44:02 GMT
• Title: Fermionic transport through a driven quantum point contact: breakdown of Floquet thermalization beyond a critical driving frequency
• Authors: Ivan V. Dudinets, Oleg Lychkovskiy,
• Abstract summary: We study a quantum system that consists of two fermionic chains coupled by a driven quantum point contact (QPC) We numerically track the evolution of the system and demonstrate that, at frequencies above a critical one, the current through the QPC halts, and the particle imbalance between the chains remains forever.
• Score: 0.0
• License:
• Abstract: We study a quantum system that consists of two fermionic chains coupled by a driven quantum point contact (QPC). The QPC contains a bond with a periodically varying tunneling amplitude. Initially the left chain is packed with fermions while the right one is empty. We numerically track the evolution of the system and demonstrate that, at frequencies above a critical one, the current through the QPC halts, and the particle imbalance between the chains remains forever. This implies a spectacular breakdown of the Floquet version of the eigenstate thermalization hypothesis which predicts a homogeneous particle density profile at large times. We confirm the effect for various driving protocols and interparticle interactions.

Related papers

• Entanglement Transition due to particle losses in a monitored fermionic chain [0.0]
  We study the dynamics of the entanglement entropy under quantum jumps that induce local particle losses in a model of free fermions hopping. We show that by tuning the system parameters, a measurement-induced entanglement transition occurs where the entanglement entropy scaling changes from logarithmic to area-law.
  arXiv  Detail & Related papers  (2024-08-07T11:30:09Z)
• Quantum phase transitions in quantum Hall and other topological systems: role of the Planckian time [0.0]
  We show that experimental data in the quantum critical regime for both integer and fractional QHEs can be quantitatively explained. We show that the model also provides quantitative description of QPTs between the ground states of anomalous QHE and axion and Chern insulators.
  arXiv  Detail & Related papers  (2023-09-01T22:25:48Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Kink correlations, domain size distribution, and the emptiness formation probability after the Kibble-Zurek quench in the quantum Ising chain [0.0]
  Linear quench of the transverse field drives the quantum Ising chain across a quantum critical point from the paramagnetic to the ferromagnetic phase. We focus on normal and anomalous quadratic correlators between fermionic kink creation and operators. Additional slowing down of the ramp in the ferromagnetic phase further increases the dephasing length and suppresses the anomalous correlator.
  arXiv  Detail & Related papers  (2022-05-17T19:17:25Z)
• Effect of Emitters on Quantum State Transfer in Coupled Cavity Arrays [48.06402199083057]
  We study the effects of atoms in cavities which can absorb and emit photons as they propagate down the array. Our model is equivalent to previously examined spin chains in the one-excitation sector and in the absence of emitters.
  arXiv  Detail & Related papers  (2021-12-10T18:52:07Z)
• Taking the temperature of a pure quantum state [55.41644538483948]
  Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research. We propose a scheme to measure the temperature of such pure states through quantum interference.
  arXiv  Detail & Related papers  (2021-03-30T18:18:37Z)
• Interplay between transport and quantum coherences in free fermionic systems [58.720142291102135]
  We study the quench dynamics in free fermionic systems. In particular, we identify a function, that we dub emphtransition map, which takes the value of the stationary current as input and gives the value of correlation as output.
  arXiv  Detail & Related papers  (2021-03-24T17:47:53Z)
• Observation of a quantum phase transition in the quantum Rabi model with a single trapped ion [0.0]
  Quantum phase transitions (QPTs) are usually associated with many-body systems with large degrees of freedom approaching the thermodynamic limit. It has been realized that a QPT can occur in a simple system composed of only a two-level atom and a single-mode bosonic field. We report the first experimental demonstration of a QPT in the quantum Rabi model using a single trapped ion.
  arXiv  Detail & Related papers  (2021-02-10T13:03:37Z)
• Evolution of a Non-Hermitian Quantum Single-Molecule Junction at Constant Temperature [62.997667081978825]
  We present a theory for describing non-Hermitian quantum systems embedded in constant-temperature environments. We find that the combined action of probability losses and thermal fluctuations assists quantum transport through the molecular junction.
  arXiv  Detail & Related papers  (2021-01-21T14:33:34Z)
• Nonequilibrium phase transition in transport through a driven quantum point contact [19.444636864515726]
  We study transport of noninteracting fermions through a periodically driven quantum point contact (QPC) connecting two tight-binding chains. We find that the heating rate vanishes identically when the driving frequency exceeds the bandwidth of the chain. This shows that a driven QPC can act as a frequency-controlled quantum switch.
  arXiv  Detail & Related papers  (2020-06-03T17:15:57Z)
• Zitterbewegung and Klein-tunneling phenomena for transient quantum waves [77.34726150561087]
  We show that the Zitterbewegung effect manifests itself as a series of quantum beats of the particle density in the long-time limit. We also find a time-domain where the particle density of the point source is governed by the propagation of a main wavefront. The relative positions of these wavefronts are used to investigate the time-delay of quantum waves in the Klein-tunneling regime.
  arXiv  Detail & Related papers  (2020-03-09T21:27:02Z)

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.