TY - JOUR
T1 - STM light emission from Si(1 1 1)-(7×7) surface using a silver tip
AU - Iwami, M.
AU - Uehara, Y.
AU - Ushioda, S.
N1 - Funding Information:
This study is supported by the program of Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Corporation. This research has been partly carried out at the Laboratory for Electronic Intelligent Systems, Research Institute of Electrical Communication, Tohoku University.
PY - 2001/1/15
Y1 - 2001/1/15
N2 - Scanning tunneling microscope-light emission (STM-LE) from the Si(1 1 1)-(7×7) surface has been measured using silver tips. For silver tips photon emission was enhanced by more than 100 times as compared with that for tungsten or platinum-iridium alloy tips. A broad spectrum with a single peak at approximately 2.25 eV was observed. The spectrum obtained can be reproduced by a theory based on the macroscopic dielectric response of the tip-sample system, indicating that the observed emission arises from the localized plasmons on the silver tip excited by tunneling electrons. Spatial variations in the emission intensity at the atomic scale was observed even under low bias voltage (2 V) and low tunneling current (1 nA) conditions.
AB - Scanning tunneling microscope-light emission (STM-LE) from the Si(1 1 1)-(7×7) surface has been measured using silver tips. For silver tips photon emission was enhanced by more than 100 times as compared with that for tungsten or platinum-iridium alloy tips. A broad spectrum with a single peak at approximately 2.25 eV was observed. The spectrum obtained can be reproduced by a theory based on the macroscopic dielectric response of the tip-sample system, indicating that the observed emission arises from the localized plasmons on the silver tip excited by tunneling electrons. Spatial variations in the emission intensity at the atomic scale was observed even under low bias voltage (2 V) and low tunneling current (1 nA) conditions.
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U2 - 10.1016/S0169-4332(00)00648-6
DO - 10.1016/S0169-4332(00)00648-6
M3 - Article
AN - SCOPUS:0035127116
SN - 0169-4332
VL - 169
SP - 188
EP - 192
JO - Applied Surface Science
JF - Applied Surface Science
IS - 170
ER -