Tunneling Spectroscopy of Andreev Energy Levels in a Quantum Dot Coupled to a Superconductor
R. S. Deacon, Y. Tanaka, A. Oiwa, R. Sakano, K. Yoshida, K. Shibata, K. Hirakawa, S. Tarucha
DOI 10.1103/PhysRevLett.104.076805 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The coupling of a quantum dot with a BCS-type superconducting reservoir results in an intriguing system where low energy physics is governed by the interplay of two distinct phases, singlet and doublet. In this Letter we show that the spectrum of Andreev energy levels, which capture the properties of the two phases, can be detected in transport measurements with a quantum dot strongly coupled to a superconducting lead and weakly coupled to a normal metal lead. We observe phase transitions between BCS singlet and degenerate magnetic doublet states when the quantum dot chemical potential is tuned with an electrostatic gate, in good qualitative agreement with numerical renormalization group calculations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
Similar papers
Tunneling spectroscopy of a single quantum dot coupled to a superconductor: From Kondo ridge to Andreev bound states
similarity 0.98J.-D. Pillet et al.
Source status unknown — claims are unverified
Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
similarity 0.96A. Kumar et al.
Source status unknown — claims are unverified
Kondo-enhanced Andreev transport in single self-assembled InAs quantum dots contacted with normal and superconducting leads
similarity 0.95R. S. Deacon et al.
Source status unknown — claims are unverified
Quasiparticle Relaxation in Optically Excited High-Q Superconducting Resonators
similarity 0.94R. Barends et al.
Source status unknown — claims are unverified
Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
similarity 0.94C. Buizert et al.
Source status unknown — claims are unverified
Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
similarity 0.94H. Courtois et al.
Source status unknown — claims are unverified