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 - Jan 1 2015
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: May 11 2015May 15 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] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2015.7157806
Samarth, Nitin. / Topological insulators : Theory & concepts. 2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc., 2015.
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Samarth, N 2015, Topological insulators: Theory & concepts. in 2015 IEEE International Magnetics Conference, INTERMAG 2015., 7157806, 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, Nitin.

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

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 https://doi.org/10.1109/INTMAG.2015.7157806