This work presents a theoretical study of the excitonic properties of
Si1-xGex cylindrical quantum wires surrounded by a Si matrix,
considering two possibilities for the conduction band alignment, type I
and type II. The effect of nonabrupt interfaces between these materials
on the exciton energies is investigated: an interfacial region of 15
angstrom in a 50 angstrom wide Si0.85Ge0.15(Si0.7Ge0.3) type-I (type-II)
quantum wire leads to an exciton energy blueshift of the order of 10
meV. The excitonic behavior under an applied magnetic field parallel to
the wire axis is also studied: exciton energies in type-I wires are
weakly affected, while for type-II wires, increasing the field causes
the electron angular momentum to change almost periodically, giving rise
to Aharonov-Bohm oscillations of the exciton ground state energy.
%0 Journal Article
%1 WOS:000240238900062
%A e Silva, J Costa
%A Chaves, Andrey
%A Freire, J A K
%A Freire, V N
%A Farias, G A
%C ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
%D 2006
%I AMER PHYSICAL SOC
%J PHYSICAL REVIEW B
%K imported
%N 8
%R 10.1103/PhysRevB.74.085317
%T Theoretical investigation of excitons in type-I and type-II Si/Si1-xGex
quantum wires
%V 74
%X This work presents a theoretical study of the excitonic properties of
Si1-xGex cylindrical quantum wires surrounded by a Si matrix,
considering two possibilities for the conduction band alignment, type I
and type II. The effect of nonabrupt interfaces between these materials
on the exciton energies is investigated: an interfacial region of 15
angstrom in a 50 angstrom wide Si0.85Ge0.15(Si0.7Ge0.3) type-I (type-II)
quantum wire leads to an exciton energy blueshift of the order of 10
meV. The excitonic behavior under an applied magnetic field parallel to
the wire axis is also studied: exciton energies in type-I wires are
weakly affected, while for type-II wires, increasing the field causes
the electron angular momentum to change almost periodically, giving rise
to Aharonov-Bohm oscillations of the exciton ground state energy.
@article{WOS:000240238900062,
abstract = {This work presents a theoretical study of the excitonic properties of
Si1-xGex cylindrical quantum wires surrounded by a Si matrix,
considering two possibilities for the conduction band alignment, type I
and type II. The effect of nonabrupt interfaces between these materials
on the exciton energies is investigated: an interfacial region of 15
angstrom in a 50 angstrom wide Si0.85Ge0.15(Si0.7Ge0.3) type-I (type-II)
quantum wire leads to an exciton energy blueshift of the order of 10
meV. The excitonic behavior under an applied magnetic field parallel to
the wire axis is also studied: exciton energies in type-I wires are
weakly affected, while for type-II wires, increasing the field causes
the electron angular momentum to change almost periodically, giving rise
to Aharonov-Bohm oscillations of the exciton ground state energy.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
author = {e Silva, J Costa and Chaves, Andrey and Freire, J A K and Freire, V N and Farias, G A},
biburl = {https://www.bibsonomy.org/bibtex/29b0938f6ee5e01e3153b6a2bd1f7cb36/ppgfis_ufc_br},
doi = {10.1103/PhysRevB.74.085317},
interhash = {89fe878ce6435c37bf1b50c109478f26},
intrahash = {9b0938f6ee5e01e3153b6a2bd1f7cb36},
issn = {2469-9950},
journal = {PHYSICAL REVIEW B},
keywords = {imported},
number = 8,
publisher = {AMER PHYSICAL SOC},
pubstate = {published},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {Theoretical investigation of excitons in type-I and type-II Si/Si1-xGex
quantum wires},
tppubtype = {article},
volume = 74,
year = 2006
}