Light emission by tunneling Cooper pairs across a vacuum gap

Y. Uehara; T. Fujita; M. Iwami; S. Ushioda

doi:10.1016/S0038-1098(00)00376-8

Light emission by tunneling Cooper pairs across a vacuum gap

Y. Uehara, T. Fujita, M. Iwami, S. Ushioda

Information Devices Division

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We have observed visible light emission by tunneling Cooper pairs across the vacuum gap of a scanning tunneling microscope (STM) formed by a Nb tip and a Nb sample at 4.7 K. Besides the usual STM light emission that is excited by single electron tunneling, we have observed a new peak at the photon energy of ℏω = 2eV₀ for a bias voltage V₀. This peak is observed only when the system is cooled below the superconducting transition temperature of niobium (9.3 K). We conclude that the new emission is excited by inelastic tunneling of Cooper pairs in superconducting Nb.

Original language	English
Pages (from-to)	539-542
Number of pages	4
Journal	Solid State Communications
Volume	116
Issue number	10
DOIs	https://doi.org/10.1016/S0038-1098(00)00376-8
Publication status	Published - 2000 Nov 7

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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abstract = "We have observed visible light emission by tunneling Cooper pairs across the vacuum gap of a scanning tunneling microscope (STM) formed by a Nb tip and a Nb sample at 4.7 K. Besides the usual STM light emission that is excited by single electron tunneling, we have observed a new peak at the photon energy of ℏω = 2eV0 for a bias voltage V0. This peak is observed only when the system is cooled below the superconducting transition temperature of niobium (9.3 K). We conclude that the new emission is excited by inelastic tunneling of Cooper pairs in superconducting Nb.",

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T1 - Light emission by tunneling Cooper pairs across a vacuum gap

AU - Uehara, Y.

AU - Fujita, T.

AU - Iwami, M.

AU - Ushioda, S.

PY - 2000/11/7

Y1 - 2000/11/7

N2 - We have observed visible light emission by tunneling Cooper pairs across the vacuum gap of a scanning tunneling microscope (STM) formed by a Nb tip and a Nb sample at 4.7 K. Besides the usual STM light emission that is excited by single electron tunneling, we have observed a new peak at the photon energy of ℏω = 2eV0 for a bias voltage V0. This peak is observed only when the system is cooled below the superconducting transition temperature of niobium (9.3 K). We conclude that the new emission is excited by inelastic tunneling of Cooper pairs in superconducting Nb.

AB - We have observed visible light emission by tunneling Cooper pairs across the vacuum gap of a scanning tunneling microscope (STM) formed by a Nb tip and a Nb sample at 4.7 K. Besides the usual STM light emission that is excited by single electron tunneling, we have observed a new peak at the photon energy of ℏω = 2eV0 for a bias voltage V0. This peak is observed only when the system is cooled below the superconducting transition temperature of niobium (9.3 K). We conclude that the new emission is excited by inelastic tunneling of Cooper pairs in superconducting Nb.

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