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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Prethermal Time-Crystalline Corner Modes.

Si Jiang1, Dong Yuan1, Wenjie Jiang1

  • 1Tsinghua University, Center for Quantum Information, IIIS, Beijing 100084, China.

Physical Review Letters
|September 26, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals prethermal discrete time crystals localized to corner modes. Their stability is ensured by topological phases or dynamical constraints, enabling robust subharmonic responses in quantum systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Simulation
  • Topological Phases

Background:

  • Discrete time crystals (DTCs) are novel phases of matter exhibiting periodic behavior in response to periodic driving.
  • Prethermal regimes offer a window to study exotic quantum phenomena beyond thermal equilibrium.
  • Corner modes in topological systems can host unique localized properties.

Purpose of the Study:

  • To demonstrate the existence of prethermal discrete time crystals localized to corner modes.
  • To identify and differentiate the mechanisms responsible for the robustness of these corner modes.
  • To explore the conditions under which prethermal time-crystalline order can be observed.

Main Methods:

  • Numerical simulations of a periodically driven two-dimensional spin model.
  • Analysis of subharmonic response and mode localization.
  • Characterization of topological phases and dynamical constraints.

Main Results:

  • Existence of prethermal discrete time crystals with corner-localized subharmonic response.
  • Two distinct mechanisms for robustness: higher-order topological phase and dynamical constraint.
  • The topological mechanism ensures stability for ground states, while the dynamical constraint allows observation for arbitrary initial states.

Conclusions:

  • Prethermal discrete time crystals can be realized and stabilized by topological or dynamical mechanisms.
  • Corner modes provide a unique platform for observing prethermal time-crystalline order.
  • The findings offer pathways for realizing robust time-crystalline phases in various dimensions.