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Published on: July 24, 2015
Odd-parity currents induced by dynamic deformations in graphene-like systems
Kai Zhang1,2, Erhu Zhang1, Huawei Chen1
1School of Science, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Abstract:
Reduced (3 + 1)-dimensional Dirac systems with inter-pseudo-spin and inter-valley scattering are employed to investigate current responses to (chiral) gauge fields in graphene-like systems. From (chiral) current-(chiral) current correlation functions, we derive the current responses. Except for electric currents induced by external gauge fields, we find the inter-valley scattering can break the topological nature of odd-parity currents. Given the proper conditions, this property can help us realize valley-polarized electric currents. Through the dynamic deformations generating the chiral gauge fields, we find the vortex-like currents while their profiles can be tuned by superposition of some deformations. In particular, we find a more manageable approach to realize the topological electric current by choosing a linear dynamic deformation.
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