Download Dirac and Weyl fermions in condensed matter systems: an introduction

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2D Dirac/Weyl fermions:
surface states of 3D topological insulators(TI)
Time-reversal(TR) symmetry protects
the gaplessness of TI surface states.
Zeeman field can open gap on
TI surface and lead to
quantum anomalous Hall effect:
each surface contribute
e2/2h Hall conductance
[observed by CZChang et al. Science'13]
YLChen et al. Science'10