Ambipolar magneto-optical response of ultralow carrier density topological insulatorsRemoveDipanjan Chaudhuri, Maryam Salehi, Sayak Dasgupta, Mintu Mondal, Jisoo Moon, Deepti Jain, Seongshik Oh, and N. P. ArmitagePhys. Rev. B 103, L081110 (2021)