Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-09-24
Phys. Rev. Lett. 104, 166803 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures, minor changes, accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.104.166803
The quantum spin Hall (QSH) state, observed in a zero magnetic field in HgTe quantum wells, respects the time-reversal symmetry and is distinct from quantum Hall (QH) states. We show that the QSH state persists in strong quantizing fields and is identified by counter-propagating (helical) edge channels with nonlinear dispersion inside the band gap. If the Fermi level is shifted into the Landau-quantized conduction or valence band, we find a transition between the QSH and QH regimes. Near the transition the longitudinal conductance of the helical channels is strongly suppressed due to the combined effect of the spectrum nonlinearity and enhanced backscattering. It shows a power-law decay 1/B^2N with magnetic field B, determined by the number of backscatterers on the edge, N. This suggests a rather simple and practical way to probe the quality of recently realized quasiballistic QSH devices using magnetoresistance measurements.
Hankiewicz Ewelina M.
Tkachov Grigory
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