期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.127205
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资金
- NSERC of Canada
- University of Waterloo
- NSF [DMR-0804564, PHY05-51164]
- Army Research Office through MURI [W911-NF-09-1-0398]
- Direct For Mathematical & Physical Scien [0804564] Funding Source: National Science Foundation
- Division Of Materials Research [0804564] Funding Source: National Science Foundation
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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