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We discovered a new universality class in driven quantum systems. This class maintains quantum coherence and nonequilibrium conditions near criticality, unlike typical systems that decohere.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Statistical mechanics

Background:

  • Driven open quantum systems often exhibit thermalization and decoherence.
  • Understanding critical phenomena in nonequilibrium systems is a key challenge.
  • Dark states in quantum systems can lead to unique dynamical properties.

Purpose of the Study:

  • To identify and characterize a novel universality class in one-dimensional driven open quantum systems.
  • To investigate the behavior of quantum coherence and nonequilibrium conditions near criticality.
  • To establish a nonequilibrium analogue of quantum criticality.

Main Methods:

  • Utilized a functional renormalization group approach.
  • Analyzed one-dimensional driven open quantum systems featuring a dark state.
  • Computed critical exponents to quantify universality.

Main Results:

  • Identified a new universality class characterized by persistent microscopic nonequilibrium conditions.
  • Observed sustained quantum coherence of dynamics near criticality.
  • Demonstrated that this class is distinct from generic driven systems that undergo thermalization and decoherence.

Conclusions:

  • This new universality class offers a nonequilibrium analogue of quantum criticality.
  • The findings contrast with classical dynamical criticality and generic driven quantum systems.
  • The research provides a framework for understanding critical phenomena in open quantum systems.