  Tellurium (Te) is an elemental semiconductor with a simple chiral crystal
structure. Te in a two-dimensional (2D) form synthesized by solution-based
method shows excellent electrical, optical, and thermal properties. In this
work, the chirality of hydrothermally grown 2D Te is identified and analyzed by
hot sulfuric acid etching and high-angle tilted high-resolution scanning
transmission electron microscopy. The gate-tunable nonlinear electrical
responses, including the nonreciprocal electrical transport in the longitudinal
direction and the nonlinear planar Hall effect in the transverse direction, are
observed in 2D Te under a magnetic field. Moreover, the nonlinear electrical
responses have opposite signs in left- and right-handed 2D Te due to the
opposite spin polarizations ensured by the chiral symmetry. The fundamental
relationship between the spin-orbit coupling and the crystal symmetry in two
enantiomers provides a viable platform for realizing chirality-based electronic
devices by introducing the chirality degree of freedom into electron transport.
