Kaasbjerg Kristen, Nitzan Abraham
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
Phys Rev Lett. 2015 Mar 27;114(12):126803. doi: 10.1103/PhysRevLett.114.126803. Epub 2015 Mar 26.
We develop a theoretical framework for the description of light emission from plasmonic contacts based on the nonequilibrium Green function formalism. Our theory establishes a fundamental link between the finite-frequency quantum noise and ac conductance of the contact and the light emission. Calculating the quantum noise to higher orders in the electron-plasmon interaction, we identify a plasmon-induced electron-electron interaction as the source of experimentally observed above-threshold light emission from biased STM contacts. Our findings provide important insight into the effect of interactions on the light emission from atomic-scale contacts.
我们基于非平衡格林函数形式体系，开发了一个用于描述等离子体接触发光的理论框架。我们的理论在接触的有限频率量子噪声、交流电导与发光之间建立了基本联系。通过在电子 - 等离子体相互作用中计算更高阶的量子噪声，我们确定等离子体诱导的电子 - 电子相互作用是实验观测到的偏置STM接触超阈值发光的来源。我们的研究结果为相互作用对原子尺度接触发光的影响提供了重要见解。
