標題: | Electron heating and current scaling in a two-dimensional electron system in close proximity to nanoscale scatterers |
作者: | Wang, Yi-Ting Yang, Chun-Kai Lin, Sheng-Di Liang, Chi-Te 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | Electron heating;Current scaling;Power law |
公開日期: | 1-五月-2014 |
摘要: | We have performed magneto-transport measurements on a two-dimensional electron system (2DES) which is in close proximity to nanoscaled scatterers. Weak localization, as evidenced by negative magnetoresistance, is observed. In this work, we use the extracted phase coherence rate as a thermometer to measure the electron\'s effective temperature T (e) in our 2DES when a high driving current I flows through the device. We find that T (e) ae I (similar to 0.52), consistent with 1/tau (ep) similar to T (2) in two dimensions, where 1/tau (ep) is the electron-phonon scattering rate. However, the phase coherence rate 1/tau (phi) similar to T, with a very small offset, is consistent with zero-temperature dephasing. Most importantly, our experimental results are in agreement with the fact that at low temperatures, the dominant phase-breaking mechanism is electron-electron scattering, not electron-phonon scattering. Therefore we are able to investigate both electron-electron scattering and electron-phonon scattering which are, in most cases, difficult to study independently in the linear region. Our data show that the electron heating effect is a very powerful tool for studying semiconductor devices. |
URI: | http://dx.doi.org/10.3938/jkps.64.1407 http://hdl.handle.net/11536/24741 |
ISSN: | 0374-4884 |
DOI: | 10.3938/jkps.64.1407 |
期刊: | JOURNAL OF THE KOREAN PHYSICAL SOCIETY |
Volume: | 64 |
Issue: | 10 |
起始頁: | 1407 |
結束頁: | 1411 |
顯示於類別: | 期刊論文 |