Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-12-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures
Scientific paper
We demonstrate that a p-n junction created electrically in HgTe quantum wells with inverted band-structure exhibits interesting intraband and interband tunneling processes. We find a perfect intraband transmission for electrons injected perpendicularly to the interface of the p-n junction. The opacity and transparency of electrons through the p-n junction can be tuned by changing the incidence angle, the Fermi energy and the strength of the Rashba spin-orbit interaction. The occurrence of a conductance plateau due to the formation of topological edge states in a quasi-one-dimensional p-n junction can be switched on and off by tuning the gate voltage. The spin orientation can be substantially rotated when the samples exhibit a moderately strong Rashba spin-orbit interaction.
Buhmann Hartmut
Chang Kai
Molenkamp Laurens W.
Xie Xin-Chen
Zhang L. B.
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