Controlling the Sign of Magnetoconductance in Andreev Quantum Dots
arXiv:0908.0666 · doi:10.1103/PhysRevLett.103.247002
Abstract
We construct a theory of coherent transport through a ballistic quantum dot coupled to a superconductor. We show that the leading-order quantum correction to the two-terminal conductance of these Andreev quantum dots may change sign depending on (i) the number of channels carried by the normal leads or (ii) the magnetic flux threading the dot. In contrast, spin-orbit interaction may affect the magnitude of the correction, but not always its sign. Experimental signatures of the effect include a non-monotonic magnetoconductance curve and a transition from an insulator-like to a metal-like temperature dependence of the conductance. Our results are applicable to ballistic or disordered dots.
Final version (4pages 3figs)- improved presentation and fig 3, and updated references
References in corpus (5)
- Full counting statistics of chaotic cavities from classical action correlations
- Quantitative measurements of the thermal resistance of Andreev interferometers
- Towards a semiclassical justification of the `effective random matrix theory' for transport through ballistic chaotic quantum dots
- Superconductivity-induced macroscopic resonant tunneling
- Macroscopic Resonant Tunneling through Andreev Interferometers
Cited by in corpus (9)
- Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire
- Coherent Thermoelectric Effects in Mesoscopic Andreev Interferometers
- Transport moments beyond the leading order
- The density of states of chaotic Andreev billiards
- Transport moments and Andreev billiards with tunnel barriers
- Combinatorial theory of the semiclassical evaluation of transport moments II: Algorithmic approach for moment generating functions
- Conductance and Thermopower of Ballistic Andreev Cavities
- Macroscopic Coherent Rectification in Andreev Interferometers
- Thermoelectric coefficients and the figure of merit for large open quantum dots