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We report measurements of the surface Shubnikov de Haas oscillations (SdH) oncrystals of the topological insulator Bi$_2$Te$_2$Se. In crystals with largebulk resistivity ($\sim$4 $\Omega$cm at 4 K), we observe $\sim$15 surface SdHoscillations (to the $n$ = 1 Landau Level) in magnetic fields $B$ up to 45Tesla. Extrapolating to the limit $1/B\to 0$, we confirm the $\frac12$-shiftexpected from a Dirac spectrum. The results are consistent with a very smallsurface Lande $g$-factor.

High-Field Shubnikov-de Haas Oscillations in the Topological Insulator Bi$_2$Te$_2$Se