Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/8994
Title: Impact of dephasing on nonequilibrium steady-state transport in fermionic chains with long-range hopping
Authors: Sarkar, Subhajit
AGARWALLA, BIJAY KUMAR
Bhakuni, Devendra Singh
Dept. of Physics
Keywords: Emergent Hydrodynamics
Quantum
Propagation
2024
2024-JUN-WEEK1
TOC-JUN-2024
Issue Date: Apr-2024
Publisher: American Physical Society
Citation: Physical Review B , 109(16), 165408.
Abstract: Quantum transport in nonequilibrium settings plays a fundamental role in understanding the properties of systems ranging from quantum devices to biological systems. Dephasing—a key aspect of out-of-equilibrium systems—arises from interactions with a noisy environment and can profoundly modify transport properties. Here we investigate the impact of dephasing on the nonequilibrium steady-state transport properties of noninteracting fermions on a one-dimensional lattice with long-range hopping (proportional to 1/𝑟𝛼), where 𝛼>1. We demonstrate the emergence of distinct transport regimes as the long-range hopping parameter, 𝛼, is tuned. In the short-range limit (𝛼≫1), transport is diffusive. Conversely, in the long-range limit [𝛼∼𝒪⁡(1)], we observe a superdiffusive transport regime. Using numerical simulations of the Lindblad master equation and corroborating these with an analysis of the current-operator norm, we identify a critical long-range hopping parameter, 𝛼𝑐≈1.5, below which superdiffusive transport becomes pronounced and rapidly becomes independent of the dephasing strength. Our results elucidate the intricate balance between dephasing and unitary dynamics, revealing steady-state transport features.
URI: https://doi.org/10.1103/PhysRevB.109.165408
http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/8994
ISSN: 2469-9950
2469-9969
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