Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36427320.
- Also identified by DOI 10.1126/sciadv.abq2479 and PMC identifier 9699670.
- Licence recorded as CC BY-NC.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
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, <b><i>J</i></b><sub>chiral</sub> = <b><i>J</i></b>(+) - <b><i>J</i></b>(-), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of <b><i>J</i></b><sub>chiral</sub> has not been demonstrated yet. Here, we report real-space imaging and control of <b><i>J</i></b><sub>chiral</sub> on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of <b><i>J</i></b><sub>chiral</sub>. In THz electric and external magnetic fields, we visualize a spatial flow of coherent <b><i>J</i></b><sub>chiral</sub> in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent <b><i>J</i></b><sub>chiral</sub> is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.