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Dynamical unbinding transition in a periodically driven Mott insulator.

Fabian Hassler1, Andreas Rüegg, Manfred Sigrist

  • 1Theoretische Physik, ETH Zurich, CH-8093 Zurich, Switzerland.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We explore double occupancy in fermionic Mott insulators using modulated hopping. A critical modulation strength reveals a transition to bound doublon-holon pairs, offering insights into critical exponents in quantum gases.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Simulation
  • Ultracold Atomic Gases

Background:

  • Fermionic Mott insulators exhibit unique quantum phenomena at half filling.
  • Dynamical control of system parameters is crucial for exploring novel quantum states.
  • Understanding doublon-holon excitations is key to characterizing strongly correlated systems.

Purpose of the Study:

  • Investigate the behavior of double occupancy in a dynamically modulated fermionic Mott insulator.
  • Characterize the crossover of doublon-holon excitations under varying modulation amplitudes.
  • Identify the critical modulation strength signaling a transition to a dynamically bound nonequilibrium state.

Main Methods:

  • Generation of a fermionic Mott insulator via dynamical periodic modulation of the hopping amplitude.
  • Analysis of doublon-holon excitations, transitioning from Fermi golden rule to damped Rabi oscillations.
  • Observation of diverging decay times for excited states at a critical modulation strength.

Main Results:

  • A crossover in excitation dynamics was observed, dependent on modulation amplitude.
  • The system transitions to a dynamically bound nonequilibrium state of doublon-holon pairs at critical modulation.
  • The critical behavior suggests the possibility of studying critical exponents.

Conclusions:

  • Dynamical modulation provides a powerful tool to engineer quantum states in fermionic Mott insulators.
  • The identified critical point offers a platform for investigating universal critical phenomena.
  • Experimental realization in fermionic quantum gases is proposed for studying critical exponents.