(Invited) Topological States in Multi-Orbital Honeycomb Lattices of HgTe (CdTe) Quantum Dots. (8th September 2015)

• Record Type: Journal Article
• Authors: Beugeling, Wouter; Kalesaki, Efterpi; Delerue, Christophe; Niquet, Yann-Michel; Vanmaekelbergh, Daniel; Morais Smith, Cristiane
• Is Part Of: ECS transactions. Volume 69:Number 5(2015)
• Page Start: 81
• Page End: 88
• Publication Date: 2015-09-08
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06905.0081ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : We summarize recent theoretical works on artificial graphene realized by honeycomb lattices of semiconductor (CdSe, HgTe, CdTe) quantum dots forming a two-dimensional single-crystalline sheet. In the case of CdSe, we predict conduction bands with Dirac cones at two distinct energies and nontrivial flat bands. An analogous behavior is found in HgTe but, in addition, the strong spin-orbit coupling opens large topologically nontrivial gaps, leaving a flattened band detached from the others. We deduce that honeycomb lattices of HgTe quantum dots may constitute promising platforms for the observation of a fractional Chern insulator or a fractional quantum spin Hall phase. Similar predictions are made for CdTe but with smaller nontrivial gaps.