Effect of dilute magnetism in a topological insulator

POSTER

Abstract

Three-dimensional topological insulator (TI) has emerged as a unique state of quantum matter and

generated enormous interests in condensed matter physics. The surfaces of a three-dimensional TI

consist of a massless Dirac cone, which is characterized by the Z2 topological invariant. Introduction

of magnetism on the surface of a TI is essential to realize the quantum anomalous Hall effect and

other novel magneto-electric phenomena. Here, by using a combination of first-principles calculations,

magneto-transport and angle-resolved photoemission spectroscopy (ARPES), we study the 

electronic properties of gadolinium (Gd)-doped Sb2Te3. Our study shows that Gd doped Sb2Te3 is

a spin-orbit-induced bulk band-gap material, whose surface is characterized by a single topological

surface state. This surface state, above the Fermi level is further confirmed by time-resolved ARPES (tr-ARPES)

measurements. Our results provide a new platform to investigate the interactions between dilute

magnetism and topology in magnetic doped topological materials.

*M.N. is supported by the Center for Thermal Energy Transport under Irradiation, anEnergy Frontier Research Center funded by the U.S. DOE, Office of Basic Energy Sciences and the Air Force Office of Scientific Research MURI (FA9550-20-1-0322).

Presenters

  • Iftakhar Bin Elius

    • University of Central Florida

Authors

  • Firoza Kabir

    • University of Central Florida

  • Iftakhar Bin Elius

    • University of Central Florida

  • Md Mofazzel Hosen

    • Boston College

  • Xiaxin Ding

    • Idaho National Laboratory
    • Los Alamos National Laboratory

  • Christopher A Lane

    • Los Alamos National Laboratory

  • Gyanendra Dhakal

    • University of Central Florida

  • Yangyang Liu

    • University of Central Florida

  • Klauss M Dimitri

    • University of Central Florida

  • Christopher Sims

    • University of Central Florida

  • Sabin Regmi

    • University of Central Florida

  • Anup Pradhan Sakhya

    • University of Central Florida
    • University of Florida

  • Luis E Persaud

    • University of Central Florida

  • John E Beetar

    • University of Central Florida

  • Yong Liu

    • École Polytechnique Fédérale de Lausanne; Ames Lab

  • Michael Chini

    • University of Central Florida

  • Arjun K Pathak

    • SUNY Buffalo State NY
    • SUNY Buffalo State College

  • Jianxin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory

  • Madhab Neupane

    • University of Central Florida

  • Krzysztof Gofryk

    • Idaho National Labs
    • Idaho National Laboratory