In this dissertation, we consider the following Schrödinger equations of fractional-type:
((-Δ)^s + b(x)x⋅∇ + q(x))u = 0 in ℝ^n,
((-∇⋅A∇)^s + q(x))u = 0 in ℝ^n.
We want to study a Landis-type conjecture for the equations above, that is, any nontrivial solution must not decay faster than a certain exponential rate. Landis-type conjecture also can be regarded as the unique continuation property (UCP) from the infinity. The Landis-type conjecture is well-studied for the case when s=1. The main ingredient is the Carleman-type inequality. However, when 0