2017
DOI: 10.1063/1.4984086
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From a ℤ2 topological insulator to a square ribbon: Tuning quantum spin Hall states and conductivity

Abstract: By introducing a new type of strained lattice, one dimensional arm-distorted ribbons, we demonstrate the possibility of opening a bandgap from the originally gapless graphene nanoribbons in the ℤ2 topological class. Typically, a gap opens up due to time-reversal/twofold rotational symmetry breaking; however, our approach leads to a bandgap at the edge of the Brillouin zone while preserving the above symmetries. The calculated gap opening is due to a properly scaled extra hopping interaction, compared to the Ka… Show more

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