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Related Experiment Video

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Classical and Quantum Liquids Induced by Quantum Fluctuations.

Miguel M Oliveira1, Pedro Ribeiro2, Stefan Kirchner3

  • 1CeFEMA, Instituto Superior Técnico, Universidade de Lisboa avenida Rovisco Pais, 1049-001 Lisboa, Portugal.

Physical Review Letters
|May 31, 2019
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Summary

This study explores quantum liquids using the Falicov-Kimball model. We found evidence for a charge disordered liquid phase, revealing insights into quantum-classical connections.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Geometrically frustrated interactions can lead to degenerate classical ground states.
  • The relationship between classical and quantum liquids, and the impact of quantum fluctuations on degeneracy, remains unclear.

Purpose of the Study:

  • Investigate the emergence of quantum liquids from classical counterparts.
  • Analyze the Falicov-Kimball model on a triangular lattice away from half-filling.

Main Methods:

  • Utilized the Falicov-Kimball model, which couples quantum and classical degrees of freedom.
  • Examined the phase diagram for weak interactions at low temperatures.

Main Results:

  • Identified a charge disordered state persisting to zero temperature.
  • Provided evidence that this state is a liquid, divided by a crossover line.
  • This line terminates at a quantum critical point.

Conclusions:

  • The charge disordered state represents a quantum liquid.
  • Quantum fluctuations play a crucial role in the transition from classical to quantum liquid behavior.
  • This work offers a new perspective on the emergence of quantum liquids.