IMSc Webinar
Chiral planar Hall effect in Weyl semimetals
Debabrata Sinha
Indian Institute of Technology, Kharagpur
Google Meet joining info
Video call link: meet.google.com/gty-aktu-kje
Or dial: (US) +1 413-853-2387 PIN: 393 846 784#
The planar Hall effect (PHE), the appearance of an in-plane transverse voltage in the presence of co-planar electric (E) and magnetic (B) fields, occurs in Weyl semimetals (WSMs) as one of the fundamental manifestations of chiral anomaly represented by a E.B term. We demonstrate here that PHE can survive in an inhomogeneous Weyl semimetal (IWSM) even in the absence of the aforesaid anomaly. Using a semiclassical Boltzmann transport theory, we show that PHE could also appear in an IWSM due to the strain-induced chiral gauge potential, which couples to the Weyl fermions of opposite chirality with opposite sign. Our study shows a resultant phase shift in the current associated with opposite chirality Weyl nodes, which, remarkably, leads to a finite chirality-dependent planar Hall effect (CPHE) in the IWSMs. Interestingly, we show that a small tilt in the Weyl node can generate a pure CPHE even in the absence of an applied magnetic field. The CPHE finds an important implication in `chiralitytronics'. We also discuss the experimental feasibility of these novel effects of strain in type-I IWSMs.
Ref: Phys. Rev. B 102, 121105 (R) 2020
Done