Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal.

ABSTRACT: Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (-) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, J_chiral = J(+) - J(-), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of J_chiral has not been demonstrated yet. Here, we report real-space imaging and control of J_chiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of J_chiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent J_chiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent J_chiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.

SUBMITTER: Park BC 

PROVIDER: S-EPMC9699670 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature