Surface states of the Topological Insulator Bi$_{1-x}$ Sb$_x$ ORAL Abstract The alloy Bi$_{1-x}$Sb$_x$ is a narrow gap semiconductor for $.07 *NSF grants DMR-0605066 March 14, 2008, 7:24 AM – March 14, 2008, 7:36 AM Authors Jeffrey Teo University of Pennsylvania Liang Fu University of Pennsylvania Charles Kane University of Pennsylvania