Terahertz conductivity and possible Bloch gain in semiconductor superlattices
(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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/318389
- author
- Shimada, Y ; Hirakawa, K ; Odnoblioudov, Maxim LU and Chao, Koung-An LU
- organization
- publishing date
- 2003
- 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
- pmid:12570445
- 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
- 2016-04-01 12:35:13
- date last changed
- 2022-03-21 06:21:49
@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}}, doi = {{10.1103/PhysRevLett.90.046806}}, volume = {{90}}, year = {{2003}}, }