Inducing quantum phase transitions in nontopological insulators via atomic control of substructural elements

Reid, Thomas K.Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA (author)

QC 20231227
Topological insulators are an important family of quantum materials that exhibit a Dirac point (DP) in the surface band structure but have a finite band gap in bulk. A large degree of spin-orbit interaction and low band gap is a prerequisite for stabilizing DPs on selective atomically flat cleavage planes. Tuning of the DP in these materials has been suggested via modifications to the atomic structure of the entire system. Using the example of As2Te3 and ZnTe5, which are not TIs, we show that a quantum phase transition can be induced in atomically flat and stepped surfaces, for As2Te3 and ZrTe5, respectively. This is achieved by establishing a framework for controlling electronic properties that is focused on local perturbations at key locations that we call substructural elements. We exemplify this framework through a unique method of isovalent sublayer anion doping and biaxial strain.

Alpay, S. PamirDepartment of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA; Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA (author)
Balatsky, Alexander V.KTH,Nordic Institute for Theoretical Physics NORDITA,Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA(Swepub:kth)u10tg5ns (author)
Nayak, Sanjeev K.Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA; Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA (author)
Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USADepartment of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA; Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA (creator_code:org_t)

By the author/editor: Reid, Thomas K.; Alpay, S. Pamir; Balatsky, Alexan ...; Nayak, Sanjeev K ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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