Titlebook: Electronic Band Structure Engineering and Ultrafast Dynamics of Dirac Semimetals; Changhua Bao Book 2023 Tsinghua University Press 2023 Li

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https://doi.org/10.1007/978-1-349-19025-6Three-dimensional (3D) Dirac semimetals [., .] are characterized by Dirac fermions with linear dispersion near the point-like Dirac nodes in the 3D momentum space, which can be viewed as 3D analogues of two-dimensional (2D) Dirac fermions in graphene.

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,Chiral Symmetry Breaking in Kekulé-Ordered Graphene,Chirality . is a fundamental property for relativistic massless Dirac fermions, which is defined by the projection of spin . onto momentum ., namely, ..

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,Coexistence of Flat Band and Kekulé Order,In solids, a flat band with a high density of states (DOS) near the Fermi energy . can enhance many-body interactions such as electron-phonon (el-ph) interaction and electron-electron correlation, thereby increasing instabilities toward exotic ordered states.