物理学报Issue(9)：377-383,7.DOI:10.7498/aps.62.097202
具有分离门电抽运石墨烯中电子-空穴等离子体的冷却效应*
Effect of cooling of electron-hole plasma in electrically pumped graphene layer structures with split gates∗
摘要
Abstract
We have studied the effect of population inversion associated with the electron and hole injection in graphene layer n-i-p structures with split gates at room temperature. Considering the transverse electric field screening of the n-section, we calculated the dependence of the electron-hole effective temperature and optical phonon effective temperature on the gate-voltage. It is shown that the injection can lead to cooling of the electron-hole plasma in n-section to the temperatures lower than the lattice temperature. The current-voltage characteristics, and the frequency-dependent dynamic conductivity are calculated, the frequency-dependent dynamic conductivity can be negative in the terahertz frequency range at a certain applied voltage. The study demonstrates that electron-hole plasma cooling can enhance the negative dynamic conductivity effect and improve the feasibility of terahertz lasing.关键词
石墨烯/n-i-p结构/有效温度/动态电导率Key words
graphene/n-i-p structure/effective temperature/dynamic conductivity引用本文复制引用
张玉萍,刘陵玉,陈琦,冯志红,王俊龙,张晓,张洪艳,张会云..具有分离门电抽运石墨烯中电子-空穴等离子体的冷却效应*[J].物理学报,2013,(9):377-383,7.基金项目
国家自然科学基金(批准号:10574011,10974017)资助的课题.@@@@Project supported by the National Natural Science Foundation of China (Grant Nos.10574011,10974017) （批准号:10574011,10974017）
