Nonequilibrium Green’s function theory for transport and gain properties of quantum cascade structures
Lee, Shun-Chen and Wacker, Andreas LU
(2002)
In Physical Review B (Condensed Matter and Materials Physics)
66.
- Abstract
- The transport and gain properties of quantum cascade (QC) structures
are investigated using a nonequilibrium Green's function (NGF) theory
which includes quantum effects beyond a Boltzmann transport description.
In the NGF theory, we include
interface roughness, impurity, and electron-phonon scattering
processes within a self-consistent Born approximation,
and electron-electron scattering in a mean-field approximation.
With this theory we obtain a description of the nonequilibrium
stationary state of QC structures under an applied bias,
and hence we determine transport properties, such as the current-voltage
characteristic of these structures. We... (More) - The transport and gain properties of quantum cascade (QC) structures
are investigated using a nonequilibrium Green's function (NGF) theory
which includes quantum effects beyond a Boltzmann transport description.
In the NGF theory, we include
interface roughness, impurity, and electron-phonon scattering
processes within a self-consistent Born approximation,
and electron-electron scattering in a mean-field approximation.
With this theory we obtain a description of the nonequilibrium
stationary state of QC structures under an applied bias,
and hence we determine transport properties, such as the current-voltage
characteristic of these structures. We define two contributions
to the current, one contribution driven by the scattering-free
part of the Hamiltonian, and the other driven by the scattering
Hamiltonian. We find that the dominant part of the current
in these structures, in contrast to simple superlattice
structures, is governed mainly by the scattering Hamiltonian.
In addition, by considering the linear response of the
stationary state of the structure to an applied optical field,
we determine the linear susceptibility, and
hence the gain or absorption spectra of the structure.
A comparison of the spectra obtained from the more rigorous
NGF theory with simpler models shows that the spectra tend to
be offset to higher values in the simpler theories. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1360479
- author
- Lee, Shun-Chen
and Wacker, Andreas
LU
- publishing date
- 2002
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 66
- article number
- 245314
- publisher
- American Physical Society
- external identifiers
-
- scopus:0037116041
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.66.245314
- language
- English
- LU publication?
- no
- id
- 43b0af42-941d-4b6f-8869-236242d10a66 (old id 1360479)
- date added to LUP
- 2016-04-04 09:05:59
- date last changed
- 2022-03-07 23:00:28
@article{43b0af42-941d-4b6f-8869-236242d10a66,
abstract = {{The transport and gain properties of quantum cascade (QC) structures<br/><br>
are investigated using a nonequilibrium Green's function (NGF) theory<br/><br>
which includes quantum effects beyond a Boltzmann transport description.<br/><br>
In the NGF theory, we include<br/><br>
interface roughness, impurity, and electron-phonon scattering<br/><br>
processes within a self-consistent Born approximation,<br/><br>
and electron-electron scattering in a mean-field approximation.<br/><br>
With this theory we obtain a description of the nonequilibrium<br/><br>
stationary state of QC structures under an applied bias,<br/><br>
and hence we determine transport properties, such as the current-voltage<br/><br>
characteristic of these structures. We define two contributions<br/><br>
to the current, one contribution driven by the scattering-free<br/><br>
part of the Hamiltonian, and the other driven by the scattering<br/><br>
Hamiltonian. We find that the dominant part of the current<br/><br>
in these structures, in contrast to simple superlattice<br/><br>
structures, is governed mainly by the scattering Hamiltonian.<br/><br>
In addition, by considering the linear response of the<br/><br>
stationary state of the structure to an applied optical field,<br/><br>
we determine the linear susceptibility, and<br/><br>
hence the gain or absorption spectra of the structure.<br/><br>
A comparison of the spectra obtained from the more rigorous<br/><br>
NGF theory with simpler models shows that the spectra tend to<br/><br>
be offset to higher values in the simpler theories.}},
author = {{Lee, Shun-Chen and Wacker, Andreas}},
issn = {{1098-0121}},
language = {{eng}},
publisher = {{American Physical Society}},
series = {{Physical Review B (Condensed Matter and Materials Physics)}},
title = {{Nonequilibrium Green’s function theory for transport and gain properties of quantum cascade structures}},
url = {{http://dx.doi.org/10.1103/PhysRevB.66.245314}},
doi = {{10.1103/PhysRevB.66.245314}},
volume = {{66}},
year = {{2002}},
}