Supercurrent Spectroscopy of Andreev States
L. Bretheau, Ç. Ö. Girit, C. Urbina, D. Esteve, H. Pothier
DOI 10.1103/PhysRevX.3.041034 · Physical Review X
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
We measure the excitation spectrum of a superconducting atomic contact. In addition to the usual continuum above the superconducting gap, the single-particle excitation spectrum contains discrete, spin-degenerate Andreev levels inside the gap. Quasiparticle excitations are induced by a broadband on-chip microwave source and detected by measuring changes in the supercurrent flowing through the atomic contact. Since microwave photons excite quasiparticles in pairs, two types of transitions are observed: Andreev transitions, which consist of putting two quasiparticles in an Andreev level, and transitions to odd states with a single quasiparticle in an Andreev level and the other one in the continuum. In contrast to absorption spectroscopy, supercurrent spectroscopy allows detection of long-lived odd states.
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. | — | Pressure not reported | unknown |
Similar papers
Dynamics of quasiparticle trapping in Andreev levels
similarity 0.95D. G. Olivares et al.
Source status unknown — claims are unverified
Flux-Modulated Andreev Current Caused by Electronic Interference
similarity 0.95H. Pothier et al.
Source status unknown — claims are unverified
Spectroscopy on Two Coupled Superconducting Flux Qubits
similarity 0.94J. B. Majer et al.
Source status unknown — claims are unverified
Charge spectrometry with a strongly coupled superconducting single-electron transistor
similarity 0.94C. P. Heij et al.
Source status unknown — claims are unverified
Multiple Andreev Reflections Revealed by the Energy Distribution of Quasiparticles
similarity 0.94F. Pierre et al.
Source status unknown — claims are unverified
Decoherence Dynamics of Complex Photon States in a Superconducting Circuit
similarity 0.94H. Wang et al.
Source status unknown — claims are unverified