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Quantum Criticality in Resonant Andreev Conduction
M Pustilnik1, B van Heck2, R M Lutchyn3
1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Physical Review Letters
|September 27, 2017
Summary
This study reveals that proximitized nanowires behave like the two-channel Kondo model at low energies. Adjusting gate voltage and contact conductances can tune these systems into a quantum critical state.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Mesoscopic systems
Background:
- Recent experiments explore proximitized nanowires.
- Understanding quantum phenomena in mesoscopic systems is crucial.
Purpose of the Study:
- Investigate the low-energy physics of a superconductor-nanowire system.
- Determine if the system can reach a quantum critical regime.
Main Methods:
- Theoretical study of a mesoscopic s-wave superconductor connected to normal leads.
- Analysis using the two-channel Kondo model.
- Exploring parameter space via gate potential and contact conductances.
Main Results:
- The system is accurately described by the two-channel Kondo model below the charging energy.
- The quantum critical regime is accessible by tuning gate voltage and contact conductances.
Conclusions:
- Proximitized nanowire systems exhibit rich Kondo physics.
- Tunability to quantum criticality offers new avenues for experimental research.
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