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Theory of electric polarization induced by inhomogeneity in crystals
Di Xiao, Junren Shi, Dennis P. Clougherty +1
We develop a general theory of electric polarization induced by inhomogeneity in crystals. We show that contributions to polarization can be classified in powers of the gradient of…
Wave-packet view of the Dirac electron
Chih-Piao Chuu, Ming-Che Chang, Qian Niu
By viewing the electron as a wavepacket in the positive energy spectrum of the Dirac equation, we are able to achieve a much clearer understanding of its behavior under weak electr…
Theory of Electromotive Force Induced by Domain Wall Motion
Shengyuan A. Yang, Di Xiao, Qian Niu
We formulate a theory on the dynamics of conduction electrons in the presence of moving magnetic textures in ferromagnetic materials. We show that the variation of local magnetizat…
Valley Dependent Optoelectronics from Inversion Symmetry Breaking
Wang Yao, Di Xiao, Qian Niu
Inversion symmetry breaking allows contrasted circular dichroism in different k-space regions, which takes the extreme form of optical selection rules for interband transitions at…
Optical Control of Topological Quantum Transport in Semiconductors
Wang Yao, A. H. MacDonald, Qian Niu
Intense coherent laser radiation red-detuned from absorption edge can reactively activate sizable Hall type charge and spin transport in n-doped paramagnetic semiconductors as a co…