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Topological insulators are characterized by spin-momentum-locked masslesssurface states which are robust under various perturbations. Manipulating suchsurface states is a topic of vigorous research, as a possible route for therealization of emergent many-body physics in topological systems. Thus far,time-reversal symmetry breaking via Coulomb and magnetic perturbations has beena dominant approach for the tuning of topological states. However, the effectof the structural degrees of freedom on quasi-particle dynamics in topologicalmaterials remains elusive. In this work, we demonstrate a transition in HfTe5between distinct topological phases as a function of either Te vacancyconcentration or applied strain; these phases are characterized theoreticallyas a transition from strong to weak topological insulator and experimentally bya transition from sharp surface states and Dirac crossing to aFermi-liquid-like quasiparticle state in which these surface-localized featuresare heavily suppressed. Although vacancies can result in various consequencessuch as scattering, doping, and structural distortions, we show that changes inthe lattice constants play the foremost role in determining the electronicstructure, self-energy, and topological states of HfTe5. Our resultsdemonstrate the possibility of using both defect chemistry and strain ascontrol parameters for topological phase transitions and associated many-bodyphysics.

On the effects of strain, defects, and interactions on the topological properties of HfTe5