Odd-parity currents induced by dynamic deformations in graphene-like systems.
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.
School of Science, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. School of Science, Xi'an Technological University, Xi'an 710021, People's Republic of China.
Kai
K
Zhang
Erhu
E
Zhang
Huawei
H
Chen
Shengli
S
Zhang