Scaling laws for nonlinear electromagnetic responses of Dirac fermion

Article

关键词: TOPOLOGICAL INSULATOR;    GRAPHENE;    POLARIZATION;   

DOI  :  10.1103/PhysRevB.93.125125

来源: SCIE

【 摘 要 】

We theoretically propose that the Dirac fermion in two dimensions shows the giant nonlinear responses to electromagnetic fields in the terahertz region. A scaling form is obtained for the current and magnetization as functions of the normalized electromagnetic fields E/E-omega and B/B-omega, where the characteristic electric (magnetic) field E-omega (B-omega) depends on the frequency omega as (h) over bar omega(2)/ev(F) ((h) over bar omega(2)/ev(F)(2)), and is typically of the order of 80 V/cm (8 mT) in the terahertz region. Applications of the present theory to graphene and surface state of a topological insulator are discussed.

【 授权许可】

Free