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Titolo:
Nonuniversal magnetic-field correlation of conductance fluctuations in quantum cavities attached to a superconductor
Autore:
Takagaki, Y; Ploog, KH;
Indirizzi:
Paul Drude Inst Solid State Elect, D-10117 Berlin, Germany Paul Drude InstSolid State Elect Berlin Germany D-10117 Berlin, Germany
Titolo Testata:
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
fascicolo: 2, volume: 69, anno: 2000,
pagine: 552 - 558
SICI:
0031-9015(200002)69:2<552:NMCOCF>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
BALLISTIC CAVITIES; MICROJUNCTIONS; JUNCTION; DOTS;
Keywords:
semiconductor-superconductor junction; conductance fluctuations; Andreev reflection; transmission resonance; stable classical orbit;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Takagaki, Y Paul Drude Inst Solid State Elect, Hausvogteipl 5-7, D-10117 Berlin, Germany Paul Drude Inst Solid State Elect Hausvogteipl 5-7 Berlin Germany D-10117
Citazione:
Y. Takagaki e K.H. Ploog, "Nonuniversal magnetic-field correlation of conductance fluctuations in quantum cavities attached to a superconductor", J PHYS JPN, 69(2), 2000, pp. 552-558

Abstract

We investigate the magnetic-field-induced transmission resonance in two-dimensional-electron-gas-superconductor junctions. The magnetic-field correlation of the conductance fluctuations is nonuniversal at low magnetic fieldsprovided the normal region las a certain kind of rectangular-shape. The anomalous magnetoconductance fluctuations are robust against the imperfectionof the quantum cavity geometry and the occupation of multiple modes in thenormal lead. However, the anomalous fluctuations are suppressed if the cavity size is not sufficiently large in comparison to the lead width. This indicates the importance of multiple Andreev reflection for the anomalous behavior. The wave function at the resonance in the anomalous fluctuations regime reveals scars by regular classical orbits. Hierarchical nature of the anomalous conductance fluctuations is evidenced by the distributions of the current and the charge.

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Documento generato il 19/09/20 alle ore 12:49:40