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Enhanced photogalvanic current in topological insulators via Fermi energy tuning
We achieve the enhancement of the circular photogalvanic effect arising from the photoinjection of spins in topological insulator thin films by tuning the Fermi level $({E}_{\mathrm{F}})$. A series of ${({\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x})}_{2}{\mathrm{Te}}_{3}$ thin films were tailored so that the Fermi energy ranges above 0.34 eV to below 0.29 eV of the Dirac …