fix: off-by-one error in InfiniteMPO quasiparticle environments

[dartsushi]

Hello I am Atsushi.
I encountered a space mismatch when taking the expectation value of the infinite MPO that is non-uniform inside the unit cell.

Belows are the function that I used to get the momentum in the y-direction of a cylinder:

function O_shift_unitcell(Ly)
    I = id(ComplexF64, Z2Space(0=>1,1=>1))
    @tensor O[W S; N E] := I[W; N] * I[S; E]
    O_ring = periodic_boundary_conditions(InfiniteMPO([O]), Ly)
    return InfiniteMPO(collect(O_ring))
end

function expectation_value_qp(O,ϕ)
    Oϕ = MPSKit.effective_excitation_hamiltonian(O, ϕ)
    return dot(ϕ,Oϕ)/ dot(ϕ,ϕ)
end

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/environments/qp_envs.jl	77.85% <100.00%> (+77.85%)	⬆️

... and 82 files with indirect coverage changes

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[lkdvos]

Hello Atsushi, nice to meet you!
Thanks for fixing this issue, this is greatly appreciated ❤️