EXISTENCE OF TOPOLOGICAL PHASE IN RbCd4As3: A FIRST PRINCIPLES STUDY

Abstract

In this work, we report topological phase in the layered arsenide RbCd4As3 using first-principles calculations. We find that RbCd4As3, have topological band inversion at T point which verifies the topological nature. Also, a small spin-orbit band gap of 0.1559 eV is observed at T point Further verification of the topological nature is carried out by calculating the Z2 topological invari ants. The parity product of valance bands shows non-zero value of Z2 topolog ical invariant. Surface density of state (SDOS) study shows existence of Dirac cone near the Fermi level. Conducting surface states near the Fermi level, as observed in SDOS, confirm the topological non-trivial nature of RbCd4As3.