Top-Squark Study at a Future e+e- Linear Collider

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We discuss a potential of studying the production and the decay of the lightest top squark (t-tilde₁) in the framework of the supersymmetric standard model at a future e+e- collider. In particular, we consider the process t-tilde₁ -> t chi⁰₁ (with chi⁰₁ being the lightest neutralino) followed by t -> bW. It is shown that, by the study of the angular distribution of the bottom quark (as well as the production cross section of the top squark), properties of chi₁⁰ can be extracted. We also discuss that, if chi⁰₁ is gaugino-like, the neutralino mixing parameters (i.e., the so-called mu-parameter and tan beta) may be constrained.