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Terahertz conductivity and possible Bloch gain in semiconductor superlattices

Shimada, Y; Hirakawa, K; Odnoblioudov, Maxim LU and Chao, Koung-An LU (2003) In Physical Review Letters 90(4: 046806).
Abstract
We have investigated terahertz emission due to dynamical electron transport in wide-miniband GaAs/Al0.3Ga0.7As superlattices. By noting that the time-domain THz emission spectroscopy inherently measures the step-response of the electron system to the bias electric field, the obtained THz spectra were compared with the high-frequency conductivities predicted for miniband transport. Excellent agreement between theory and experiment strongly supports that the THz gain due to Bloch oscillating electrons persists at least up to 1.7 THz. It was also found that Zener tunneling into the second miniband sets the high-frequency limit to the THz gain for the samples studied here.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
90
issue
4: 046806
publisher
American Physical Society
external identifiers
  • wos:000180703000041
  • scopus:4243536788
ISSN
1079-7114
DOI
10.1103/PhysRevLett.90.046806
language
English
LU publication?
yes
id
818df66e-be93-4834-ae08-3e8f769a8769 (old id 318389)
date added to LUP
2007-09-21 12:46:06
date last changed
2018-01-07 06:23:15
@article{818df66e-be93-4834-ae08-3e8f769a8769,
  abstract     = {We have investigated terahertz emission due to dynamical electron transport in wide-miniband GaAs/Al0.3Ga0.7As superlattices. By noting that the time-domain THz emission spectroscopy inherently measures the step-response of the electron system to the bias electric field, the obtained THz spectra were compared with the high-frequency conductivities predicted for miniband transport. Excellent agreement between theory and experiment strongly supports that the THz gain due to Bloch oscillating electrons persists at least up to 1.7 THz. It was also found that Zener tunneling into the second miniband sets the high-frequency limit to the THz gain for the samples studied here.},
  author       = {Shimada, Y and Hirakawa, K and Odnoblioudov, Maxim and Chao, Koung-An},
  issn         = {1079-7114},
  language     = {eng},
  number       = {4: 046806},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Terahertz conductivity and possible Bloch gain in semiconductor superlattices},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.90.046806},
  volume       = {90},
  year         = {2003},
}