Single valley Dirac fermions in zero-gap HgTe quantum wells

Details Single valley Dirac fermions in zero-gap HgTe quantum wells Single valley Dirac fermions in zero-gap HgTe quantum wells

2010-09-12

arxiv.org/abs/1009.2248v2

Nature Phys.7:418-422,2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

version 2: supplementary material added

Scientific paper

10.1038/nphys1914

Dirac fermions have been studied intensively in condensed matter physics in recent years. Many theoretical predictions critically depend on the number of valleys where the Dirac fermions are realized. In this work, we report the discovery of a two dimensional system with a single valley Dirac cone. We study the transport properties of HgTe quantum wells grown at the critical thickness separating between the topologically trivial and the quantum spin Hall phases. At high magnetic fields, the quantized Hall plateaus demonstrate the presence of a single valley Dirac point in this system. In addition, we clearly observe the linear dispersion of the zero mode spin levels. Also the conductivity at the Dirac point and its temperature dependence can be understood from single valley Dirac fermion physics.

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