%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 }