Unusual Magnetotransport from two dimensional Dirac Fermions in Pd$_{3}$Bi$_{2}$Se$_{2}$

Shama; Dinesh Kumar; Goutam Sheet; Yogesh Singh

doi:10.1016/j.physe.2022.115457

paper

Unusual Magnetotransport from two dimensional Dirac Fermions in Pd $_{3}$ Bi $_{2}$ Se $_{2}$

arXiv:2204.04402 · doi:10.1016/j.physe.2022.115457

Abstract

Pd $_{3}$ Bi $_{2}$ Se $_{2}$ has been proposed to be topologically non-trivial in nature. However, evidence of its non-trivial behavior is still unexplored. We report the growth and magneto-transport study of Pd $_{3}$ Bi $_{2}$ Se $_{2}$ thin films, revealing for the first time the contribution of two-dimensional (2D) topological surface states. We observe exceptional non-saturated linear magnetoresistance which results from Dirac fermions inhabiting the lowest Landau level in the quantum limit. The transverse magnetoresistance changes from a semi-classical weak-field $B^{2}$ dependence to a high-field $B$ dependence at a critical field $B^{⋆}$ . It is found that $B^{⋆} \propto T^{2}$ , which is expected from the Landau level splitting of a linear energy dispersion. In addition, the magnetoconductivity shows signatures of 2D weak anti-localization (WAL). These novel magnetotransport signatures evince the presence of 2D Dirac fermions in Pd $_{3}$ Bi $_{2}$ Se $_{2}$ thin films.

arXiv comment8 pages, 6 figures

Unusual Magnetotransport from two dimensional Dirac Fermions in Pd3​Bi2​Se2​

Abstract

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Unusual Magnetotransport from two dimensional Dirac Fermions in Pd $_{3}$ Bi $_{2}$ Se $_{2}$