Adiabatic quantum pumping through surface states in 3D topological insulators

Title

Adiabatic quantum pumping through surface states in 3D topological insulators

 Author

Alos-Palop, M.
Tiwari, R.P.
Blaauboer, M.

Faculty

Applied Sciences

 Department

Quantum Nanoscience

 Date

2012-11-06

 Abstract

We investigate adiabatic quantum pumping of ballistic Dirac fermions on the surface of a strong three-dimensional topological insulator. Two different geometries are studied in detail, a normal metal–ferromagnetic–normal metal (NFN) junction and a ferromagnetic–normal metal–ferromagnetic (FNF) junction. Using a scattering matrix approach, we show that each time a new resonant mode appears in the transport window the pumped current exhibits a maximum and provide a detailed analysis of the position of these maxima. We also predict a characteristic difference between the pumped current in NFN- and FNF-junctions: whereas the former vanishes for carriers at normal incidence, the latter is finite due to the different nature of wavefunction interference in the junctions. Finally, we predict an experimentally distinguishable difference between the pumped current and the conductance.

 To reference this document use:

http://resolver.tudelft.nl/uuid:f5b5bafc-ba98-4399-9131-e6529ef8ba09

 DOI

https://doi.org/10.1088/1367-2630/14/11/113003

 Publisher

IOP Publishing

 ISSN

1367-2630

 Source

http://iopscience.iop.org/1367-2630/14/11/113003

 Source

New Journal of Physics, 14(Nov)2012

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

(c)2012 Alos-Palop, M., Tiwari, R.P., Blaauboer, M.
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