try fix

Author: GiggleLiu

src/algorithms/timestep/tdvp.jl

@@ -148,7 +148,7 @@ function timestep!(ψ::AbstractFiniteMPS, H, t::Number, dt::Number, alg::TDVP2,
         ψ.AC[i + 1] = (complex(nc), _transpose_front(nar))
 
         if i != (length(ψ) - 1)
-            ψ.AC[i + 1] = integrate(∂∂AC(i + 1, ψ, H, envs), ψ.AC[i + 1], t, -dt / 2,
+            ψ.AC[i + 1] = integrate(∂∂AC(i + 1, ψ, H, envs), ψ.AC[i + 1], t + dt / 2, -dt / 2,
                                     alg.integrator)
         end
     end
@@ -164,7 +164,7 @@ function timestep!(ψ::AbstractFiniteMPS, H, t::Number, dt::Number, alg::TDVP2,
         ψ.AC[i] = (complex(nc), _transpose_front(nar))
 
         if i != 2
-            ψ.AC[i - 1] = integrate(∂∂AC(i - 1, ψ, H, envs), ψ.AC[i - 1], t + dt / 2,
+            ψ.AC[i - 1] = integrate(∂∂AC(i - 1, ψ, H, envs), ψ.AC[i - 1], t + dt,
                                     -dt / 2, alg.integrator)
         end
     end