Monochromatic electron emission from the macroscopic quantum state of a superconductor

K. Nagaoka, T. Yamashita, S. Uchiyama, M. Yamada, H. Fujii, C. Oshima

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The ground state of a superconductor is a macroscopic quantum state that can extend coherently over substantial distances. As a result, electrons tunnelling from two different points (separated by macroscopic length) on the surface of a superconductor remain coherent in phase and so are able to interfere: this property forms the basis of superconducting quantum interference devices (SQUIDs). Another characteristic of electrons tunnelling from a superconductor is that they are monochromatic, their energy being determined by the ground-state energy of the superconducting state. Monochromatic electrons have been observed tunnelling from a superconductor to a normal metal, and the resulting currents have been used to probe the dynamics of atoms and molecules at interfaces. Here we report the results of field-emission experiments that confirm the prediction that monochromatic electrons can similarly be emitted from a superconductor into vacuum. Monochromatic emissions of this type might find application as the sources in a range of electron-based spectroscopies.

Original languageEnglish
Pages (from-to)557-559
Number of pages3
JournalNature
Volume396
Issue number6711
DOIs
Publication statusPublished - 1998 Dec 10

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electron emission
electron tunneling
electrons
ground state
field emission
interference
vacuum
energy
probes
predictions
metals
spectroscopy
atoms
molecules

ASJC Scopus subject areas

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Nagaoka, K., Yamashita, T., Uchiyama, S., Yamada, M., Fujii, H., & Oshima, C. (1998). Monochromatic electron emission from the macroscopic quantum state of a superconductor. Nature, 396(6711), 557-559. https://doi.org/10.1038/25098

Monochromatic electron emission from the macroscopic quantum state of a superconductor. / Nagaoka, K.; Yamashita, T.; Uchiyama, S.; Yamada, M.; Fujii, H.; Oshima, C.

In: Nature, Vol. 396, No. 6711, 10.12.1998, p. 557-559.

Research output: Contribution to journalArticle

Nagaoka, K, Yamashita, T, Uchiyama, S, Yamada, M, Fujii, H & Oshima, C 1998, 'Monochromatic electron emission from the macroscopic quantum state of a superconductor', Nature, vol. 396, no. 6711, pp. 557-559. https://doi.org/10.1038/25098
Nagaoka K, Yamashita T, Uchiyama S, Yamada M, Fujii H, Oshima C. Monochromatic electron emission from the macroscopic quantum state of a superconductor. Nature. 1998 Dec 10;396(6711):557-559. https://doi.org/10.1038/25098
Nagaoka, K. ; Yamashita, T. ; Uchiyama, S. ; Yamada, M. ; Fujii, H. ; Oshima, C. / Monochromatic electron emission from the macroscopic quantum state of a superconductor. In: Nature. 1998 ; Vol. 396, No. 6711. pp. 557-559.
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