Physical Review B· 2012
Dirac semimetal and topological phase transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>A</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Bi (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mtext>Na</mml:mtext></mml:mrow></mml:math>, K, Rb)
- 1,886citations
- 2012year
Short summary
Crystalline A3Bi (A=Na, K, Rb) are identified as Dirac semimetals with bulk 3D Dirac points protected by crystal symmetry, exhibiting nontrivial Fermi arcs and predicted phenomena like giant diamagnetism.
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Key points
- A3Bi (A=Na, K, Rb) compounds are Dirac semimetals with symmetry-protected bulk 3D Dirac points.
- These materials exhibit nontrivial Fermi arcs on their surfaces.
- They are predicted to show giant diamagnetism, linear quantum magnetoresistance, and quantum spin Hall effect.
- Symmetry-breaking can drive these compounds into various topologically distinct phases.
AI-generated from the title and abstract; the full text is not read.
Abstract
Three-dimensional (3D) Dirac point, where two Weyl points overlap in momentum space, is usually unstable and hard to realize. Here we show, based on the first-principles calculations and effective model analysis, that crystalline ${A}_{3}$Bi ($A=\text{Na}$, K, Rb) are Dirac semimetals with bulk 3D Dirac points protected by crystal symmetry. They possess nontrivial Fermi arcs on the surfaces and can be driven into various topologically distinct phases by explicit breaking of symmetries. Giant diamagnetism, linear quantum magnetoresistance, and quantum spin Hall effect will be expected for such compounds.
The authors' abstract, as published at the source. Physical Review B, 2012 · DOI ↗
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Field: Atomic and Molecular Physics, and Optics
Atomic and Molecular Physics, and OpticsPhysics and Astronomy