Controlling the quantum spin Hall edge states in two-dimensional transition metal dichalcogenides

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Pulkin, Artem</dc:creator>
  <dc:creator>Yazyev, Oleg V.</dc:creator>
  <dc:description>Two-dimensional transition metal dichalcogenides (TMDs) of Mo and W in their 1T′ crystalline phase host the quantum spin Hall (QSH) insulator phase. We address the electronic properties of the QSH edge states by means of first-principles calculations performed on realistic models of edge terminations of different stoichiometries. The QSH edge states show a tendency to have complex band dispersions and coexist with topologically trivial edge states. We nevertheless identify two stable edge terminations that allow isolation of a pair of helical edge states within the band gap of TMDs, with monolayer 1T′-WSe2 being the most promising material. We also characterize the finite-size effects in the electronic structure of 1T′-WSe2 nanoribbons. Our results provide guidance to the experimental studies and possible practical applications of QSH edge states in monolayer 1T′-TMDs.</dc:description>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>Creative Commons Attribution 4.0 International</dc:rights>
  <dc:subject>transition metal dichalcogenides</dc:subject>
  <dc:subject>quantum spin Hall effect</dc:subject>
  <dc:subject>edge states</dc:subject>
  <dc:subject>topological insulators</dc:subject>
  <dc:subject>2D materials</dc:subject>
  <dc:title>Controlling the quantum spin Hall edge states in two-dimensional transition metal dichalcogenides</dc:title>