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22 papers
Chiral magnetic effect in the absence of Weyl node
Ming-Che Chang, Min-Fong Yang
The nodal points in a Weyl semimetal are generally considered as the causes of the chiral anomaly and the chiral magnetic effect (CME). Employing a linear-response analysis of a tw…
Chiral magnetic effect in two-band lattice model of Weyl semimetal
Ming-Che Chang, Min-Fong Yang
Employing a two-band model of Weyl semimetal, the existence of the chiral magnetic effect (CME) is established within the linear-response theory. The crucial role played by the lim…
Persistent currents in a graphene ring with armchair edges
Bor-Luen Huang, Ming-Che Chang, Chung-Yu Mou
A graphene nano-ribbon with armchair edges is known to have no edge state. However, if the nano-ribbon is in the quantum spin Hall (QSH) state, then there must be helical edge stat…
Density of states of a graphene in the presence of strong point defects
Bor-Luen Huang, Ming-Che Chang, Chung-Yu Mou
The density of states near zero energy in a graphene due to strong point defects with random positions are computed. Instead of focusing on density of states directly, we analyze e…
Semiclassical dynamics and transport of the Dirac spin
Chih-Piao Chuu, Ming-Che Chang, Qian Niu
A semiclassical theory of spin dynamics and transport is formulated using the Dirac electron model. This is done by constructing a wavepacket from the positive-energy electron band…
Berry Phase Effects on Electronic Properties
Di Xiao, Ming-Che Chang, Qian Niu
Ever since its discovery, the Berry phase has permeated through all branches of physics. Over the last three decades, it was gradually realized that the Berry phase of the electron…