Valley-contrasting physics in graphene: magnetic moment and topological transport.
By Di Xiao, W. Yao, Q. Niu. Physical Review Letters, 2007
1,570 citations recorded by the source corpus.
We investigate physical properties that can be used to distinguish the valley degree of freedom in systems where inversion symmetry is broken, using graphene systems as examples. We show that the pseudospin associated with the valley index of carriers has an intrinsic magnetic moment, in close analogy with the Bohr magneton for the electron spin. There is also a valley dependent Berry phase effect that can result in a valley contrasting Hall transport, with carriers in different valleys turning into opposite directions transverse to an in-plane electric field. These effects can be used to generate and detect valley polarization by magnetic and electric means, forming the basis for the valley-based electronics applications.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/ace3b488235e98e4fe52235b12344f763c32006d
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Weyl and Dirac semimetals in three-dimensional solids (2017, background): “The effect is still felt in regions of zero Berry curvature through an effective vector potential – the Berry connection (Xiao et al., 2007).”
- Experimental Observation of Topologically Protected Helical Edge Modes in Patterned Elastic Plates (2018, neutral): “This vortex behavior may be viewed as a pseudospin analogous to the A-B sublattice or the topbottom layer pseudospin in graphene systems [39].”
- Quantum anomalous Hall effect and related topological electronic states (2015, background): “bilayers [156{ 162], etc. Valleys, as an additional degree of freedom of electrons on honeycomb lattice, have attracted considerable interest, for which valleytronics has been coined as a new concept [207,208]. We will leave the discussions of topological states in graphene and silicene to readers, ”