[22p-P02-1~3] 13.6 ナノ構造・量子現象・ナノ量子デバイス

▲ [22p-P02-3] Terahertz quantum cascade lasers approaching room-temperature operation: Design by non-equilibrium Green’s functions and the experiments

〇WANG LI¹、Tsung-Tse LIN¹、Thomas Grange²、Stefan Birner²、Ke Wang³、Hideki Hirayama¹ (1.RIKEN、2.nextnano, Germany、3.Nanjing University, China)

キーワード：quantum cascasde lasers

In this work, we propose a new design based on non-equilibrium Green's function, in which it creates isolated three-subbands by using ministep located in the center of lower well, to push up the high-lying quantum states for suppression the thermally activated electrons leakages. Due to tunability in this ministep, the design freedom can be large. We initially observe lasing close 200K in the on-going experiments.