Pseudospin in graphene
WebMar 28, 2011 · The pseudospins are both related to the peculiar band structure of graphene, shown in Fig. 1. One is called sublattice pseudospin and the other valley isospin. The former occurs due to the bipartite … WebOct 26, 2015 · Abstract Interband optical transitions in graphene are subject to pseudospin selection rules. Impulsive excitation with linearly polarized light generates an anisotropic photocarrier occupation in momentum space that evolves at time scales shorter than 100 fs.
Pseudospin in graphene
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WebWe show the presence of non-relativistic Lévy-Leblond fermions in flat three- and four-layers graphene with AB stacking, extending the results obtained in Cariglia et al. 2024 for bilayer graphene. When the layer is curved we obtain a set of equations for Galilean fermions that are a variation of those of Lévy-Leblond with a well defined combination of pseudospin, … WebApr 23, 2012 · In our view, the most intriguing possibilities for 2DDSs are gate-tunable dilute-moment or nanoparticle-array magnetism at topological-insulator or graphene surfaces, and layer-pseudospin giant...
WebFigure 1 Graphene with band gap. (a) Graphene band energy (E) versus momentum (k) dispersion with a band gap D at the Dirac points. (b) Trivial gap structure in Haldane’s model: The pseudospin P z(k), indicated by up and down arrows, points in the same direction at both Dirac points K and K0. The winding number contributions cancel. WebMar 9, 2024 · Very recently, it was demonstrated that intervalley scattering induced by the single carbon defect of graphene leads to phase winding over a closed path surrounding the defect. Motivated by this, we demonstrate that the single carbon defects at A and B sublattices of graphene can be regarded as pseudospin-mediated atomic-scale vortices …
WebJan 5, 2024 · In this paper, we propose an extended Hamiltonian of graphene to include the electron-phonon scattering designed as the SU (2) rotation of pseudospin and properly … WebIn graphene, the strong Coulomb interactions and approximate spin-pseudo spin symmetry are predicted to lead to a variety of quantum Hall ferromagnetic ground states and …
WebApr 7, 2024 · The Dirac point in monolayer graphene is a phase singularity, being the vertex center for the rotation of the pseudospin. As the wave function progresses through an adiabatic cycle that includes a Dirac point, it accumulates a gauge-invariant geometrical and topological phase, i.e., Berry phase:
WebFeb 22, 2016 · Artificial optical graphene has been used to demonstrate that pseudospin is a measurable physical quantity. In particular, multiple-beam interference, which is carefully aligned with the... cheap stock to watchWebJun 19, 2012 · Helicity and Pseudospin in Graphene. The Hamiltonian for graphene at k → away from the K point is proportional to. The helicity operator is σ → ⋅ k → / k, which is … cyber security themes in powerpointWebWe show the presence of non-relativistic Lévy-Leblond fermions in flat three- and four-layers graphene with AB stacking, extending the results obtained in Cariglia et al. 2024 for … cheap stock to invest in nowcyber security themeWebThe pseudospin vector field in graphene BZ. Note that this field is for the conduction band and the pseudospin field for the valence band is given by reversing the direction of each arrow.... cyber security themes for powerpointWebever, pseudospin does not respond to a magnetic field. For graphene, one approach to modulating pseudospin is through mechanical deformation that generates a “pseudomagnetic” field [9,15,16]. In another method, an electrical potential induced mass type of perturbation in bilayer or monolayer graphene [6,17–19] leading to an energy gap ... cyber security the loftWebAbstract. Graphene, a one-atom-thick form of carbon, has emerged in the last few years as a fertile electron system, highly promising for both fundamental research and applications. In this thesis we consider several topics in electronic and spin properties of graphene, with a particular emphasis on the quantum Hall effect (QHE) regime, where ... cheap stock that pays high dividend