Triplet State and Auger-Type Excitation Originating from Two-Electron Tunneling in Field Emission Resonance on Ag(100)

• URL: http://arxiv.org/abs/2306.04916v1
• Date: Thu, 8 Jun 2023 03:38:12 GMT
• Title: Triplet State and Auger-Type Excitation Originating from Two-Electron Tunneling in Field Emission Resonance on Ag(100)
• Authors: Shin-Ming Lu, Ho-Hsiang Chang, Wei-Bin Su, Wen-Yuan Chan, Kung-Hsuan Lin, and Chia-Seng Chang
• Abstract summary: An energy gap above the vacuum level in the projected bulk band structure of Ag(100) prevents electrons in the first-order field emission resonance from inducing surface plasmons. This mechanism allows light emission from FER to reveal characteristics of triplet states and Auger-type excitation resulting from two-electron tunneling in FER.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this study, we discovered that the energy gap above the vacuum level in the projected bulk band structure of Ag(100) prevents electrons in the first-order field emission resonance (FER) from inducing the surface plasmons. This mechanism allows light emission from FER to reveal characteristics of triplet states and Auger-type excitation resulting from two-electron tunneling in FER. According to optical spectra, surface plasmons can be induced by electrons in the zeroth-order FER. However, corresponding radiative decay can also trigger Auger-type excitation, whose energy state is influenced by the sharpness-dependent image potential acting on the scanning tunneling microscope tip.

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