Topological insulators: Theory & concepts

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The spin-orbit interaction in condensed matter [1] is a key ingredient of contemporary approaches to spintronics [2,3]. These approaches have primarily focused on the 'interior' bulk electronic states of semiconductors and metals with parabolic energy-momentum dispersion. Early theoretical work however showed that in narrow band gap semiconductor heterostructures (derived from (Pb, Sn)Te and (Hg, Cd)Te), the spin-orbit interaction can lead to helical two dimensional (2D) interface states with a massless (linear) Dirac dispersion [4]. Over the past 5 years or so, we have witnessed a rebirth of these concepts in the more contemporary context of 'topological insulators,' driven by the recognition of deep and fundamental connections between surface or edge states and topological invariants [5,6]. In their 2D realization, topological insulators exhibit spin-polarized one-dimensional (1D) edge states [7], while the three-dimensional (3D) versions are characterized by 2D surface states with a spin-textured Dirac cone dispersion [8]. The inherent spin-texture of these electronic states provides a natural route toward 'topological spintronics' by generating an efficient spin-transfer torque [9,10].

Original languageEnglish (US)
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973224
DOIs
StatePublished - Jul 14 2015
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: May 11 2015May 15 2015

Publication series

Name2015 IEEE International Magnetics Conference, INTERMAG 2015

Other

Other2015 IEEE International Magnetics Conference, INTERMAG 2015
CountryChina
CityBeijing
Period5/11/155/15/15

Fingerprint

Magnetoelectronics
Electronic states
Orbits
Interface states
Surface states
Heterojunctions
Cones
Momentum
Torque
Textures
Metals
Semiconductor materials
mercury cadmium telluride
Narrow band gap semiconductors

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Samarth, N. (2015). Topological insulators: Theory & concepts. In 2015 IEEE International Magnetics Conference, INTERMAG 2015 [7157806] (2015 IEEE International Magnetics Conference, INTERMAG 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2015.7157806
Samarth, N. / Topological insulators : Theory & concepts. 2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc., 2015. (2015 IEEE International Magnetics Conference, INTERMAG 2015).
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Samarth, N 2015, Topological insulators: Theory & concepts. in 2015 IEEE International Magnetics Conference, INTERMAG 2015., 7157806, 2015 IEEE International Magnetics Conference, INTERMAG 2015, Institute of Electrical and Electronics Engineers Inc., 2015 IEEE International Magnetics Conference, INTERMAG 2015, Beijing, China, 5/11/15. https://doi.org/10.1109/INTMAG.2015.7157806

Topological insulators : Theory & concepts. / Samarth, N.

2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7157806 (2015 IEEE International Magnetics Conference, INTERMAG 2015).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Samarth N. Topological insulators: Theory & concepts. In 2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc. 2015. 7157806. (2015 IEEE International Magnetics Conference, INTERMAG 2015). https://doi.org/10.1109/INTMAG.2015.7157806