Quantum quench in two dimensions using the variational Baeriswyl wave function

B. Dóra, Masudul Haque, Frank Pollmann, Balázs Hetényi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

By combining the Baeriswyl wave function with equilibrium and time-dependent variational principles, we develop a nonequilibrium formalism to study quantum quenches for two-dimensional spinless fermions with nearest-neighbor hopping and repulsion. The variational ground-state energy, the charge-density wave (CDW) order parameter, and the short-time dynamics agree convincingly with the results of numerically exact simulations. We find that, depending on the initial and final interaction strength, the quenched system either exhibits oscillatory behavior or relaxes to a time-independent steady state. The time-averaged expectation value of the CDW order parameter rises sharply when crossing from the steady-state regime to the oscillating regime, indicating that the system, being nonintegrable, shows signs of thermalization with an effective temperature above or below the equilibrium critical temperature, respectively.

Original languageEnglish
Article number115124
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume93
Issue number11
DOIs
Publication statusPublished - Mar 15 2016

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Charge density waves
Wave functions
wave functions
Fermions
Ground state
Temperature
variational principles
critical temperature
fermions
formalism
ground state
simulation
interactions
temperature
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Quantum quench in two dimensions using the variational Baeriswyl wave function. / Dóra, B.; Haque, Masudul; Pollmann, Frank; Hetényi, Balázs.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 93, No. 11, 115124, 15.03.2016.

Research output: Contribution to journalArticle

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