Josephson radiation in a superconductor-quantum dot-superconductor junction
arXiv:2003.04023 · doi:10.1103/PhysRevResearch.2.033158
Abstract
We investigate the Josephson radiation emitted by a junction made of a quantum dot coupled to two conventional superconductors. Close to resonance, the particle-hole symmetric Andreev states that form in the junction are detached from the continuum above the superconducting gap in the leads, while a gap between them opens near the Fermi level. Under voltage bias, we formulate a stochastic model that accounts for non-adiabatic processes, which change the occupations of the Andreev states. This model allows calculating the current noise spectrum and determining the Fano factor. Analyzing the finite-frequency noise, we find that the model may exhibit either an integer or a fractional AC Josephson effect, depending on the bias voltage and the size of the gaps in the Andreev spectrum. Our results assess the limitations in using the fractional Josephson radiation as a probe of topology.
arXiv comment5+4 pages, 4 + 2 figures
References in corpus (22)
- Unpaired Majorana fermions in quantum wires
- Josephson Current and Noise at a Superconductor-Quantum Spin Hall Insulator-Superconductor Junction
- AC JOSEPHSON EFFECT IN A SINGLE QUANTUM CHANNEL
- Fractional ac Josephson effect in p- and d-wave superconductors
- Josephson and Andreev transport through quantum dots
- AC Josephson effect in finite-length nanowire junctions with Majorana modes
- Josephson Current through a correlated quantum level: Andreev states and Pi-junction behavior
- Josephson radiation from gapless Andreev bound states in HgTe-based topological junctions
- Observation of the 4-periodic Josephson effect in indium arsenide nanowires
- Non-equilibrium Josephson effect through helical edge states
- Dynamics of Majorana States in a Topological Josephson Junction
- Evidence for long-lived quasiparticles trapped in superconducting point contacts
- Supercurrent noise in quantum point contacts
- Phenomenology and Dynamics of Majorana Josephson Junction
- Demonstration of an ac Josephson junction laser
- The Anderson-Josephson quantum dot -- A theory perspective
- Non-equilibrium dynamics of Andreev states in the Kondo regime
- Non-equilibrium current noise in mesoscopic disordered SNS junctions
- AC Josephson effect and resonant Cooper pair tunneling emission of a Cooper Pair Transistor
- Enhanced shot noise of multiple Andreev reflections in a carbon nanotube quantum dot in SU(2) and SU(4) Kondo regimes
- Fermi liquid approach for superconducting Kondo problems
- Superconducting quantum dot and the sub-gap states