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Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
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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.
Nature Communications
|November 17, 2022
Summary
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.
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.
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