Work

Fermionic transport through a driven quantum point contact: Breakdown of Floquet thermalization controlled by the driving frequency

Year: 2025

Type: article

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 certain threshold, 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 that predicts a homogeneous particle density profile at large times. We confirm the effect for various driving protocols and interparticle interactions.

Source: Physical Review Research

DOI: 10.1103/qgbs-l7d3

Authors: Ivan V. Dudinets, Oleg Lychkovskiy

Institutions: Moscow Institute of Physics and Technology, Russian Quantum Center, Skolkovo Institute of Science and Technology, Russian Academy of Sciences, Steklov Mathematical Institute

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funder: Ministry of Science and Higher Education of the Russian Federation