Conduction channels of superconducting quantum point contacts

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2000
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Levy Yeyati, Alfredo
Martín-Rodero, Alvaro
Joyez, Philippe
Devoret, Michel H.
Esteve, Daniel
Urbina, Cristián
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Physica / B [Condensed Matter]. 2000, 280(1-4), pp. 425-431. Available under: doi: 10.1016/S0921-4526(99)01812-8
Zusammenfassung

Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coefficients {T_n} can be determined by analyzing the subgap structure due to multiple Andreev reflections in the current-voltage (I-V) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a small number of atoms. In the smallest stable contacts, usually three channels contribute to the transport. We show here that the channel ensemble {T_n} of few atom contacts remains unchanged up to temperatures and magnetic fields approaching the critical temperature and the critical field, respectively, giving experimental evidence for the prediction that the conduction channels are the same in the normal and in the superconducting state.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
530 Physik
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Magnetic field, Multiple Andreev reflection, Point contacts, Quantum wires
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ISO 690SCHEER, Elke, Juan Carlos CUEVAS, Alfredo LEVY YEYATI, Alvaro MARTÍN-RODERO, Philippe JOYEZ, Michel H. DEVORET, Daniel ESTEVE, Cristián URBINA, 2000. Conduction channels of superconducting quantum point contacts. In: Physica / B [Condensed Matter]. 2000, 280(1-4), pp. 425-431. Available under: doi: 10.1016/S0921-4526(99)01812-8
BibTex
@article{Scheer2000Condu-8872,
  year={2000},
  doi={10.1016/S0921-4526(99)01812-8},
  title={Conduction channels of superconducting quantum point contacts},
  number={1-4},
  volume={280},
  journal={Physica / B [Condensed Matter]},
  pages={425--431},
  author={Scheer, Elke and Cuevas, Juan Carlos and Levy Yeyati, Alfredo and Martín-Rodero, Alvaro and Joyez, Philippe and Devoret, Michel H. and Esteve, Daniel and Urbina, Cristián}
}
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