期刊
APPLIED PHYSICS EXPRESS
卷 16, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.35848/1882-0786/acbd0f
关键词
compound semiconductors; terahertz spectroscopy; superlattices
We investigate how the initial energy distribution of electrons in a biased semiconductor superlattice, created by femtosecond pump pulses, affects terahertz Bloch oscillations. The emitted terahertz waveforms are well reproduced from a damped oscillation current with capacitive nature. In-plane excess energy changes the relaxation time via scattering processes, while partial use of the pump pulse spectrum reduces the temporal resolution.
We investigate how the initial three-dimensional energy distribution of electrons created by femtosecond pump pulses in a biased semiconductor superlattice affects terahertz Bloch oscillations, which imitate a step response to a bias electric field. The emitted terahertz waveforms are well reproduced from a damped oscillation current with capacitive nature, exhibiting shorter relaxation times and worse temporal resolutions for central pump photon energies that are outside the range of ordinary electron excitation into the conduction first miniband. This indicates that in-plane excess energy changes the relaxation time via scattering processes, while partial use of the pump pulse spectrum reduces the temporal resolution.
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