Topological phase transitions in antimony without gap parity reversal
Department of Physics, University of Illinois at Urbana-Champaign - 1110 West Green Street, Urbana, IL 61801-3080, USA and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign 104 South Goodwin Avenue, Urbana, IL 61801-2902, USA
Received: 22 September 2014
Accepted: 18 December 2014
A common feature for all three-dimensional topologically nontrivial materials is an inverted band gap. Transitioning to a topological state typically involves a gap reversal caused by a strong spin-orbit coupling (SOC), and is accompanied by the appearance of topological surface states. A distinctly different behavior in antimony (Sb), where the topological transition does not involve gap reversal and the surface states survive the transition, is investigated. First-principles calculations are used to determine the electronic band structure of Sb for various SOC strengths. The results illustrate a new type of topological phase transition despite the same underlying Z2 topological order.
PACS: 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
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