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Superlattice gain in positive differential conductivity region

Winge, David O. LU ; Franckié, Martin LU and Wacker, Andreas LU (2016) In AIP Advances 6(4).
Abstract

We analyze theoretically a superlattice structure proposed by A. Andronov et al. [JETP Lett. 102, 207 (2015)] to give Terahertz gain for an operation point with positive differential conductivity. Here we confirm the existence of gain and show that an optimized structure displays gain above 20 cm-1 at low temperatures, so that lasing may be observable. Comparing a variety of simulations, this gain is found to be strongly affected by elastic scattering. It is shown that the dephasing modifies the nature of the relevant states, so that the common analysis based on Wannier-Stark states is not reliable for a quantitative description of the gain in structures with extremely diagonal transitions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
AIP Advances
volume
6
issue
4
publisher
American Institute of Physics
external identifiers
  • Scopus:84969690074
  • WOS:000375845100025
ISSN
2158-3226
DOI
10.1063/1.4948538
language
English
LU publication?
yes
id
a2af8254-fdf7-4050-8e68-65c68d9376e6
date added to LUP
2016-07-08 11:59:42
date last changed
2017-02-10 14:24:14
@article{a2af8254-fdf7-4050-8e68-65c68d9376e6,
  abstract     = {<p>We analyze theoretically a superlattice structure proposed by A. Andronov et al. [JETP Lett. 102, 207 (2015)] to give Terahertz gain for an operation point with positive differential conductivity. Here we confirm the existence of gain and show that an optimized structure displays gain above 20 cm<sup>-1</sup> at low temperatures, so that lasing may be observable. Comparing a variety of simulations, this gain is found to be strongly affected by elastic scattering. It is shown that the dephasing modifies the nature of the relevant states, so that the common analysis based on Wannier-Stark states is not reliable for a quantitative description of the gain in structures with extremely diagonal transitions.</p>},
  articleno    = {045025},
  author       = {Winge, David O. and Franckié, Martin and Wacker, Andreas},
  issn         = {2158-3226},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {American Institute of Physics},
  series       = {AIP Advances},
  title        = {Superlattice gain in positive differential conductivity region},
  url          = {http://dx.doi.org/10.1063/1.4948538},
  volume       = {6},
  year         = {2016},
}