Transport in selectively magnetically doped topological insulator wires
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical SocietyDate
2015-12-29Citation
10.1103/PhysRevB.92.235445
Physical Review B - Condensed Matter and Materials Physics 92.23 (2015): 235445
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.92.235445Funded by
Funding for this work was provided by Spanish MINECO through Grants No. FIS2012-33521 and No. FIS2014-55486 and COLCIENCIAS through Grant No. 110165843163Project
Gobierno de España. FIS2012-33521; Gobierno de España. FIS2014-55486; Gobierno de España. 110165843163Editor's Version
http://dx.doi.org/10.1103/PhysRevB.92.235445Subjects
Electronic and transport properties; Magnetic; Green’s functions; Wire; Nanowire cross section; FísicaRights
© 2015 American Physical SocietyAbstract
We study the electronic and transport properties of a topological insulator nanowire including selective magnetic doping of its surfaces. We use a model which is appropriate to describe materials like Bi2Se3 within a k · p approximation and consider nanowires with a rectangular geometry.Within this model the magnetic doping at the (111) surfaces induces a Zeeman field which opens a gap at the Dirac cones corresponding to the surface states. For obtaining the transport properties in a two terminal configuration we use a recursive Green’s function method based on a tight-binding model which is obtained by discretizing the original continuous model. For the case of uniform magnetization of two opposite nanowire (111) surfaces we show that the conductance can switch from a quantized value of e2/h (when the magnetizations are equal) to a very small value (when they are
opposite).We also analyze the case of nonuniform magnetizations in which the Zeeman field on the two opposite surfaces change sign at themiddle of the wire. For this case we find that conduction by resonant tunneling through a chiral state bound at the middle of the wire is possible. The resonant level position can be tuned by imposing
an Aharonov-Bohm flux through the nanowire cross section
Files in this item
Google Scholar:Acero, Sergio
-
Brey, Luis
-
Herrera, William J.
-
Levy-Yeyati Mizrahi, Alfredo
This item appears in the following Collection(s)
Related items
Showing items related by title, author, creator and subject.