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Low energy excitation of surface states of a three-dimensional topologicalinsulator (3DTI) can be described by Dirac fermions. By using a tight-bindingmodel, the transport properties of the surface states in a uniform magneticfield is investigated. It is found that chiral surface states parallel to themagnetic field are responsible to the quantized Hall (QH) conductance$(2n+1)\frac{e^2}{h}$ multiplied by the number of Dirac cones. Due to thetwo-dimension (2D) nature of the surface states, the robustness of the QHconductance against impurity scattering is determined by the oddness andevenness of the Dirac cone number. An experimental setup for transportmeasurement is proposed.

Three-Dimensional Topological Insulator in a Magnetic Field: Chiral Side Surface States and Quantized Hall Conductance