Existence and Stability of Standing Waves for the Inhomogeneous Schrödinger Equations with Mixed Fractional Laplacians

In this paper, we consider the existence and orbital stability of standing waves for the inhomogeneous Schrödinger equations with mixed fractional Laplacians i ∂ t ψ− ( −Δ ) s 1 ψ− ( −Δ ) s 2 ψ+ | x | −γ | ψ | 2σ ψ=0, ( t,x )∈[ 0,T )× ℝ N , where N≥2 , 0 s 2 s 1 1 , and 0γ2 s 1 . In the L 2 -subcritical case, i.e., 0σ 2 s 1 −γ N , we establish the existence and orbital stability of standing waves. Our approach is based on the concentration-compactness principle in the fractional Sobolev spaces H s 1 for s 1 ∈( 0,1 ) .