Weyl Semimetal in a Topological Insulator Multilayer
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Abstract
We propose a simple realization of the three-dimensional (3D) Weyl semimetal phase, utilizing a multilayer structure, composed of identical thin films of a magnetically doped 3D topological insulator, separated by ordinary-insulator spacer layers. We show that the phase diagram of this system contains a Weyl semimetal phase of the simplest possible kind, with only two Dirac nodes of opposite chirality, separated in momentum space, in its band structure. This Weyl semimetal has a finite anomalous Hall conductivity and chiral edge states and occurs as an intermediate phase between an ordinary insulator and a 3D quantum anomalous Hall insulator. We find that the Weyl semimetal has a nonzero dc conductivity at zero temperature, but Drude weight vanishing as T(2), and is thus an unusual metallic phase, characterized by a finite anomalous Hall conductivity and topologically protected edge states.
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The record
- Venue
- Physical Review Letters
- Topic
- Topological Materials and Phenomena
- Field
- Physics and Astronomy
- Canadian institutions
- University of Waterloo
- Funders
- Army Research OfficeNational Science Foundation
- Keywords
- Weyl semimetalSemimetalCondensed matter physicsTopological insulatorPhysicsPhase diagramPosition and momentum spaceInsulator (electricity)Quantum Hall effectPhase (matter)Topology (electrical circuits)Quantum mechanicsElectronBand gap
- Has abstract in OpenAlex
- yes