Impact of Dissipation on Universal Fluctuation Dynamics in Open Quantum Systems

• URL: http://arxiv.org/abs/2202.02176v2
• Date: Tue, 15 Feb 2022 04:30:17 GMT
• Title: Impact of Dissipation on Universal Fluctuation Dynamics in Open Quantum Systems
• Authors: Kazuya Fujimoto, Ryusuke Hamazaki, Yuki Kawaguchi
• Abstract summary: dissipation drastically alters universal particle-number-fluctuation dynamics related to surface-roughness growth in non-interacting fermions and bosons. In a system under dephasing that causes loss of spatial coherence, we find that a universality class of surface-roughness dynamics changes from the ballistic class to a class with the Edwards-Wilkinson scaling exponents.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Recent experimental and theoretical works have uncovered nontrivial quantum dynamics due to external dissipation. Using an exact numerical method and a renormalization-group-based analytical technique, we theoretically elucidate that dissipation drastically alters universal particle-number-fluctuation dynamics related to surface-roughness growth in non-interacting fermions and bosons. In a system under dephasing that causes loss of spatial coherence, we find that a universality class of surface-roughness dynamics changes from the ballistic class to a class with the Edwards-Wilkinson scaling exponents and an unconventional scaling function. On the other hand, in a system under dissipation with in- and out-flow of particles that breaks particle-number conservation, the universal dynamics is lost.

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