465 research outputs found
Impact of Dissipation on Universal Fluctuation Dynamics in Open Quantum Systems
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.Comment: 22 pages, 11 figure
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