TY - JOUR
T1 - Light emission by tunneling Cooper pairs across a vacuum gap
AU - Uehara, Y.
AU - Fujita, T.
AU - Iwami, M.
AU - Ushioda, S.
N1 - Funding Information:
This work was supported by Japan Science and Technology Corporation through the CREST Program.
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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U2 - 10.1016/S0038-1098(00)00376-8
DO - 10.1016/S0038-1098(00)00376-8
M3 - Article
AN - SCOPUS:0034325340
VL - 116
SP - 539
EP - 542
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 10
ER -