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Vortex dynamics in the two-dimensional BCS-BEC crossover.

Max Heyl1,2, Kyosuke Adachi3,4, Yuki M Itahashi1

  • 1Quantum-Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo, Japan.

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|November 17, 2022
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Summary
This summary is machine-generated.

Researchers studied vortex dynamics in LixZrNCl superconductors near the Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensation (BEC) crossover. They observed enhanced Hall angles, providing insights into charged particle transport in these systems.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Cold Atom Physics

Background:

  • Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensation (BEC) represent limiting ground states for paired fermion systems.
  • The crossover between BCS and BEC states is crucial for understanding high-temperature superconductivity and cold atom superfluidity.
  • Ultra-low doped superconductors like graphene and LixZrNCl offer experimental access to the BCS-BEC crossover regime.

Purpose of the Study:

  • To investigate vortex dynamics near the BCS-BEC crossover using LixZrNCl as a model system.
  • To probe charged particle transport phenomena in the transition region between BCS and BEC superconductivity.
  • To understand the role of Hall effect in characterizing vortex behavior across the crossover.

Main Methods:

  • Utilized LixZrNCl, a superconductor with a stable band structure, for experimental studies.
  • Employed the Hall effect measurement as a sensitive probe of vortex dynamics.
  • Applied phenomenological time-dependent Ginzburg-Landau (TDGL) theory for theoretical validation.

Main Results:

  • Observed a systematic enhancement of the Hall angle as the system approached the BCS-BEC crossover.
  • The experimental findings were qualitatively consistent with predictions from TDGL theory.
  • Demonstrated that LixZrNCl's clean electronic structure facilitates a comprehensive analysis of the vortex Hall effect.

Conclusions:

  • LixZrNCl serves as an excellent platform for studying the BCS-BEC crossover in superconductors.
  • The observed vortex dynamics provide a global picture of particle transport towards the BEC regime.
  • Gate-controlled superconductors are promising for exploring novel properties of BEC superconductors.