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Title: Topological nonmagnetic impurity states in topological Kondo insulators

Abstract

We examine here the presence of nonmagnetic impurities in a hybridization gap model of a Kondo insulator which has band inversion. The model has been used to predict that SmB6 is a topological insulator. We show that there are two types of nonmagnetic impurity states in a Kondo insulator. The type of states can be categorized as deep impurity states, similar to the impurity states in an ordinary metal, and impurity states which have energies within the hybridization gap. Unlike the deep impurity states which only form if the impurity potential exceeds a critical value of the order of the conduction bandwidth, the in-gap impurity states form for exceptionally small values of the impurity potential comparable to the hybridization gap. This finding may explain why Kondo insulators are found to be exceptionally sensitive to impurities. We demonstrate that these in-gap states are caused by band inversion and have properties similar to those expected for impurities in a topological insulator.

Authors:
 [1]; ORCiD logo [1];  [1]
  1. Temple Univ., Philadelphia, PA (United States)
Publication Date:
Research Org.:
Temple Univ., Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1617903
Alternate Identifier(s):
OSTI ID: 1602362
Grant/Contract Number:  
FG02-01ER45872
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Abele, M., Yuan, X., and Riseborough, Peter S. Topological nonmagnetic impurity states in topological Kondo insulators. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.094101.
Abele, M., Yuan, X., & Riseborough, Peter S. Topological nonmagnetic impurity states in topological Kondo insulators. United States. doi:https://doi.org/10.1103/PhysRevB.101.094101
Abele, M., Yuan, X., and Riseborough, Peter S. Mon . "Topological nonmagnetic impurity states in topological Kondo insulators". United States. doi:https://doi.org/10.1103/PhysRevB.101.094101. https://www.osti.gov/servlets/purl/1617903.
@article{osti_1617903,
title = {Topological nonmagnetic impurity states in topological Kondo insulators},
author = {Abele, M. and Yuan, X. and Riseborough, Peter S.},
abstractNote = {We examine here the presence of nonmagnetic impurities in a hybridization gap model of a Kondo insulator which has band inversion. The model has been used to predict that SmB6 is a topological insulator. We show that there are two types of nonmagnetic impurity states in a Kondo insulator. The type of states can be categorized as deep impurity states, similar to the impurity states in an ordinary metal, and impurity states which have energies within the hybridization gap. Unlike the deep impurity states which only form if the impurity potential exceeds a critical value of the order of the conduction bandwidth, the in-gap impurity states form for exceptionally small values of the impurity potential comparable to the hybridization gap. This finding may explain why Kondo insulators are found to be exceptionally sensitive to impurities. We demonstrate that these in-gap states are caused by band inversion and have properties similar to those expected for impurities in a topological insulator.},
doi = {10.1103/PhysRevB.101.094101},
journal = {Physical Review B},
number = 9,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}

Works referenced in this record:

Heavy fermion semiconductors
journal, May 2000


Theory of the dynamic magnetic response of Ce 3 Bi 4 Pt 3 : A heavy-fermion semiconductor
journal, June 1992


Topological Kondo Insulators
journal, March 2010


SmB 6 : A Promising Candidate for a Topological Insulator
journal, December 2011


Classification of topological insulators and superconductors in three spatial dimensions
journal, November 2008


Magnetic and Semiconducting Properties of Sm B 6
journal, February 1969


Physical Properties of Sm B 6
journal, March 1971


Large low-temperature Hall effect and resistivity in mixed-valent Sm B 6
journal, December 1979


Low-temperature surface conduction in the Kondo insulator SmB 6
journal, November 2013


Surface Hall Effect and Nonlocal Transport in SmB6: Evidence for Surface Conduction
journal, November 2013

  • Kim, D. J.; Thomas, S.; Grant, T.
  • Scientific Reports, Vol. 3, Issue 1
  • DOI: 10.1038/srep03150

Topological surface state in the Kondo insulator samarium hexaboride
journal, March 2014

  • Kim, D. J.; Xia, J.; Fisk, Z.
  • Nature Materials, Vol. 13, Issue 5
  • DOI: 10.1038/nmat3913

Tuning Bulk and Surface Conduction in the Proposed Topological Kondo Insulator SmB 6
journal, March 2015


Transport gap in SmB 6 protected against disorder
journal, June 2019

  • Eo, Yun Suk; Rakoski, Alexa; Lucien, Juniar
  • Proceedings of the National Academy of Sciences, Vol. 116, Issue 26
  • DOI: 10.1073/pnas.1901245116

Surface electronic structure of the topological Kondo-insulator candidate correlated electron system SmB6
journal, December 2013

  • Neupane, M.; Alidoust, N.; Xu, S-Y.
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms3991

Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission
journal, December 2013

  • Jiang, J.; Li, S.; Zhang, T.
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms4010

Emergence of a Coherent In-Gap State in the SmB 6 Kondo Insulator Revealed by Scanning Tunneling Spectroscopy
journal, March 2014


Hybridization gap and Fano resonance in SmB 6
journal, March 2014

  • Rößler, Sahana; Jang, Tae-Hwan; Kim, Dae-Jeong
  • Proceedings of the National Academy of Sciences, Vol. 111, Issue 13
  • DOI: 10.1073/pnas.1402643111

Topological surface states interacting with bulk excitations in the Kondo insulator SmB 6 revealed via planar tunneling spectroscopy
journal, May 2016

  • Park, Wan Kyu; Sun, Lunan; Noddings, Alexander
  • Proceedings of the National Academy of Sciences, Vol. 113, Issue 24
  • DOI: 10.1073/pnas.1606042113

Additional energy scale in SmB6 at low-temperature
journal, December 2016

  • Jiao, L.; Rößler, S.; Kim, D. J.
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms13762

Planar tunneling spectroscopy of the topological Kondo insulator SmB 6
journal, May 2017


Evidence for in-gap surface states on the single phase SmB6(001) surface
journal, October 2017


Magnetic excitations in SmB6 single crystals
journal, May 1993


Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB 6
journal, January 2015


Magnetic bound states in SmB6
journal, October 2000


Spin excitons in heavy fermion semiconductors
journal, May 2001


Incomplete protection of the surface Weyl cones of the Kondo insulator SmB 6 : Spin exciton scattering
journal, August 2015


Effects of spin excitons on the surface states of SmB 6 : A photoemission study
journal, December 2016


Low-energy electrodynamics of SmB 6
journal, January 1999


Properties of the in-gap states in SmB6
journal, March 2001


Specific heat of SmB6 at very low temperatures
journal, May 2006


Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau in SmB 6
journal, July 2014


Isosbestic points in doped Sm B 6 as features of universality and property tuning
journal, September 2017


Physical properties of Sm x B 6 single crystals
journal, January 2019

  • Stankiewicz, Jolanta; Evangelisti, Marco; Rosa, Priscila F. S.
  • Physical Review B, Vol. 99, Issue 4
  • DOI: 10.1103/PhysRevB.99.045138

Heavy surface state in a possible topological Kondo insulator: Magnetothermoelectric transport on the (011) plane of SmB 6
journal, February 2015


Two-dimensional Fermi surfaces in Kondo insulator SmB 6
journal, December 2014


One-dimensional edge state transport in a topological Kondo insulator
journal, November 2015

  • Nakajima, Yasuyuki; Syers, Paul; Wang, Xiangfeng
  • Nature Physics, Vol. 12, Issue 3
  • DOI: 10.1038/nphys3555

Screened moments and extrinsic in-gap states in samarium hexaboride
journal, April 2018


Unconventional Fermi surface in an insulating state
journal, July 2015


Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6
journal, October 2017

  • Hartstein, M.; Toews, W. H.; Hsu, Y. -T.
  • Nature Physics, Vol. 14, Issue 2
  • DOI: 10.1038/nphys4295

Bulk Fermi Surface of Charge-Neutral Excitations in SmB 6 or Not: A Heat-Transport Study
journal, June 2016


Field-dependent heat transport in the Kondo insulator SmB 6 : Phonons scattered by magnetic impurities
journal, June 2018


Anomalous three-dimensional bulk ac conduction within the Kondo gap of SmB 6 single crystals
journal, October 2016


A simple theory of the Kondo hole
journal, April 1991

  • Sollie, R.; Schlottmann, P.
  • Journal of Applied Physics, Vol. 69, Issue 8
  • DOI: 10.1063/1.347971

Collapse of the coherence gap in Kondo semiconductors
journal, December 2003


Breakdown of the Kondo insulating state in SmB 6 by introducing Sm vacancies
journal, August 2016


Bulk Rotational Symmetry Breaking in Kondo Insulator SmB 6
journal, September 2017


Quantum Oscillations in Flux-Grown SmB 6 with Embedded Aluminum
journal, April 2019


Quantum Oscillation from In-Gap States and a Non-Hermitian Landau Level Problem
journal, July 2018


Intrinsic Low-Temperature Magnetism in SmB 6
journal, November 2019


Fermion number fractionization in quantum field theory
journal, April 1986


Solitons with fermion number ½
journal, June 1976


A PCAC puzzle: π0→γγ in the σ-model
journal, March 1969


Massive Dirac fermions and spin physics in an ultrathin film of topological insulator
journal, March 2010


Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit
journal, June 2010

  • Zhang, Yi; He, Ke; Chang, Cui-Zu
  • Nature Physics, Vol. 6, Issue 8
  • DOI: 10.1038/nphys1689

Correlation effects on a topological insulator at finite temperatures
journal, March 2012


Kondo Breakdown in Topological Kondo Insulators
journal, April 2015


Metallic alloys
journal, September 1958


XIV. The distribution of electrons round impurities in monovalent metals
journal, February 1952

  • Friedel, J.
  • The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 43, Issue 337
  • DOI: 10.1080/14786440208561086

On some Electrical and Magnetic Properties of Metallic Solid Solutions
journal, December 1956

  • Friedel, J.
  • Canadian Journal of Physics, Vol. 34, Issue 12A
  • DOI: 10.1139/p56-134

Localized Magnetic States in Metals
journal, October 1961


Effects of Configuration Interaction on Intensities and Phase Shifts
journal, December 1961


Topological Insulators in Three Dimensions
journal, March 2007


Vacancy-induced bound states in topological insulators
journal, July 2011