Possible Signatures of Chiral Anomaly in the Magnetoresistance of a Quasi‐2‐Dimensional Electron Gas at the Interface of LaVO3 and KTaO3. (11th June 2022)

• Record Type: Journal Article
• Authors: Silotia, Harsha; Kumari, Anamika; Gupta, Anshu; De, Joydip; Pal, Santanu Kumar; Tomar, Ruchi; Chakraverty, Suvankar
• Is Part Of: Advanced Electronic Materials. Volume 8:Number 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-11
• Subjects: axial relaxation time -- chiral anomaly -- negative longitudinal magnetoresistance -- topological planar Hall effect; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202200195
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: In a Dirac semimetal, charges flow between two Weyl nodes when electric and magnetic fields ( E || B ) are parallel to each other manifesting interesting physical properties such as negative longitudinal magnetoresistance (NLMR), planar Hall effect (PHE). A co‐existence of weak antilocalization (WAL) is observed with large NLMR and an unusual Hall resistance with ( B || E ) configuration, at the conducting interface of LaVO3 (LVO) and KTaO3 (KTO). The full‐width half maxima of the depth of the conducting channel at the interface is estimated to be around 10 nm by using spectroscopy techniques of photoluminescence and time‐correlated single‐photon counting: suggesting a quasi‐2‐dimensional nature of the conducting electrons. The PHE exhibits oscillatory behavior as a function of the angle between E and B . Very similar temperature dependence of NLMR and PHE suggest a strong correlation among them. Abstract : The authors report the possible signatures of the "Adler–Bell–Jackiw anomaly" and the possible existence of (quasi) 2‐dimensional (≈10 nm thick) Weyl fermions at the conducting interface of LaVO3 (LVO)‐KTaO3 (KTO), by using magneto‐transport and optical spectroscopic measurements. Negative longitudinal magnetoresistance (NLMR), as well as finite transverse magnetoresistance, have emerged as possible signatures of the chiral anomaly in (B||E) configuration.