Tuning the quantum oscillations of surface Dirac electrons in the topological insulator Bi${}_2$Te${}_2$Se by liquid gating

Jun Xiong, Yuehaw Khoo, Shuang Jia +2

In Bi${}_2$Te${}_2$Se, the period of quantum oscillations arising from surface Dirac fermions can be increased 6-fold using ionic liquid gating. At large gate voltages, the Fermi energ…