Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-11-19
Phys. Rev. B 83, 165304 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 5 figures (expanded discussion section, corrected typos)
Scientific paper
10.1103/PhysRevB.83.165304
We investigate electron interferometry of edge states in Topological Insulators. We show that, when inter-boundary coupling is induced at two quantum point contacts of a four terminal setup, both Fabry-P\'erot-like and Aharonov-Bohm-like loop processes arise. These underlying interference effects lead to a full electrically controllable system, where the magnitude of charge and spin linear conductances can be tuned by gate voltages, without applying magnetic fields. In particular we find that, under appropriate conditions, inter-boundary coupling can lead to negative values of the conductance. Furthermore, the setup also allows to selectively generate pure charge or pure spin currents, by choosing the voltage bias configuration.
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