  Chirality arises from the asymmetry of matters, where two counterparts are
the mirror image of each other. The interaction between circular-polarization
light and quantum materials is enhanced in chiral space groups due to the
structural chirality. Tellurium (Te) possesses the simplest chiral crystal
structure, with Te atoms covalently bonded into a spiral atomic chain (left- or
right-handed) with a periodicity of three. Here, we investigate the tunable
circular photo-electric responses in 2D Te field-effect transistor with
different chirality, including the longitudinal circular photogalvanic effect
induced by the radial spin texture (electron-spin polarization parallel to the
electron momentum direction) and the circular photovoltaic induced by the
chiral crystal structure (helical Te atomic chains). Our work demonstrates the
controllable manipulation of the chirality degree of freedom in materials.
