Dynamical Franz-Keldysh effect in GaAs/AlGaAs multiple quantum wells induced by single-cycle terahertz pulses
Dynamical Franz-Keldysh effect in GaAs/AlGaAs multiple quantum wells induced by single-cycle terahertz pulses
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DOI：
10.1063/1.3518483
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发表时间：
2010-11-22
影响因子：
4
通讯作者：
Tanaka, K.
中科院分区：
文献类型：
--
作者：
Shinokita, K.;Hirori, H.;Tanaka, K.
研究了强单周期太赫兹脉冲作用下GaAs/AlGaAs多量子阱带隙附近的吸收光谱。随着太赫兹电场的增大，带隙附近的重空穴1s激子能量红移，达到最大值，转为蓝移。蓝移正比于质变能，即太赫兹电场的平方而增加，这与直流电场中Frantz-Keldysh效应（FKE）的预期响应不同。这一事实表明，观测到的蓝移对质心能量的依赖可以归因于动态FKE。(C) 2010年美国物理研究所。(doi: 10.1063/1.3518483)
We studied absorption spectra near the band gap of GaAs/AlGaAs multiple quantum wells subjected to strong single-cycle terahertz pulses. With an increasing terahertz electric field, the heavy-hole 1s exciton energy near the band gap redshifts, reaches a maximum, and turns to blueshift. The blueshift increases proportionally to the ponderomotive energy, i.e., the terahertz electric field squared, which differs from the response expected from the Frantz-Keldysh effect (FKE) in a dc electric field. This fact suggests that the observed ponderomotive energy dependence of the blueshift can be ascribed to the dynamical FKE. (C) 2010 American Institute of Physics. [doi:10.1063/1.3518483]