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Anomalous Transport in the Superfluid Fluctuation Regime
Shun Uchino1, Masahito Ueda1,2
1RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
Physical Review Letters
|March 25, 2017
Summary
Superfluid fluctuations in reservoirs enhance particle conductance and blur plateaus in interacting fermion transport. Spin conductance is suppressed due to wire resistance, aligning with experimental findings.
Area of Science:
- Condensed Matter Physics
- Ultracold Atomic Gases
Background:
- Transport phenomena in one-dimensional systems are crucial for understanding quantum mechanics.
- Superfluidity in interacting fermion systems exhibits unique quantum effects.
Purpose of the Study:
- To analyze the transport of attractively interacting fermions in a 1D wire near the superfluid transition.
- To investigate the impact of superfluid fluctuations on conductance.
Main Methods:
- Theoretical analysis of fermion transport in a ballistic regime.
- Modeling conductance renormalization due to superfluid fluctuations in reservoirs.
- Investigating particle and spin transport mechanisms.
Main Results:
- Quantized conductance in the absence of interaction is renormalized by superfluid fluctuations.
- Particle conductance is significantly enhanced, with plateaus blurred by bosonic pair transport.
- Spin conductance is suppressed due to contact and wire resistance.
Conclusions:
- Superfluid fluctuations play a significant role in renormalizing transport properties of interacting fermions.
- The theoretical model qualitatively explains observed experimental phenomena in ultracold atom experiments.
- Emergent bosonic pair transport influences particle conductance, while wire resistivity affects spin conductance.
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