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Two- and three-dimensional topological phases in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>BiTe</mml:mi><mml:mi>X</mml:mi></mml:mrow></mml:math> compounds
Recently, it was shown that quantum spin Hall insulator phase with a gap wide enough for practical applications can be realized in the ultrathin films constructed from two inversely stacked structural elements of trivial band insulator BiTeI. Here, we study the edge states in nanoribbons made of the ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{2}{\mathrm{I}}_{2}$ sextuple …