Mixed-Valence Transition on a Quantum-Dot Coupled to Superconducting and Spin-Polarized Leads
arXiv:1808.06869 · doi:10.1103/PhysRevB.99.075161
Abstract
We consider a quantum dot coupled to both superconducting and spin-polarized electrodes, and study the triad interplay of the Kondo effect, superconductivity, and ferromagnetism, any pair of which compete with and suppress each other. We find that the interplay leads to a mixed-valence quantum phase transition, which for other typical sysmstems is merely a crossover rather than a true transition. At the transition, the system changes from the spin doublet to singlet state. The singlet phase is adiabatically connected (through crossovers) to the so-called 'charge Kondo state' and to the superconducting state. We analyze in detail the physical characteristics of different states and propose that the measurement of the cross-current correlation and the charge relaxation resistance can clearly distinguish between them.
arXiv comment8 figures; to appear in Phys. Rev. B
References in corpus (31)
- The numerical renormalization group method for quantum impurity systems
- Andreev Reflection In Ferromagnet-Superconductor Junctions
- Electric Field Control of Spin Transport
- Kondo effect in quantum dots coupled to ferromagnetic leads
- A Quantum Dot in the Kondo Regime Coupled to Superconductors
- Energy resolution and discretization artefacts in the numerical renormalization group
- Josephson and Andreev transport through quantum dots
- NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
- Kondo Effect and Josephson Current through a Quantum Dot between Two Superconductors
- Kondo effect in a quantum dot coupled to ferromagnetic leads: A numerical renormalization group analysis
- Two-channel Kondo effect and renormalization flow with macroscopic quantum charge states
- Josephson current through a nanoscale magnetic quantum dot
- Proximity and Josephson effects in superconductor - two dimensional electron gas planar junctions
- Nanospintronics with carbon nanotubes
- Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
- Ferromagnetic proximity effect in F-QDot-S device
- Andreev reflection through a quantum dot coupled with two ferromagnets and a superconductor
- pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads
- Kondo resonance enhanced supercurrent in single wall carbon nanotube Josephson junctions
- Spin-dependent Andreev reflection tunneling through a quantum dot with intradot spin-flip scattering
- 0- quantum transition in a carbon nanotube Josephson junction: universal phase dependence and orbital degeneracy
- Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase
- Proximity effect on spin-dependent conductance and thermopower of correlated quantum dots
- Magnetoresistance of a quantum dot with spin-active interfaces
- Many-body Correlation Effect on Mesoscopic Charge Relaxation
- Kondo effect and STM spectra through ferromagnetic nanoclusters
- Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting Leads
- Quantum impurity coupled to Majorana edge fermions
- Comment on "Josephson Current through a Nanoscale Magnetic Quantum Dot"
- Josephson versus Kondo coupling in a quantum dot connected to two superconductors
- Quantum Resistor-Capacitor Circuit with Majorana Fermion Modes in Chiral Topological Superconductor