genSU2Parity()

Tensor< 4 > syten::MPS::Lat::genSU2Parity	(	Basis const &	mpo_basis,
		Basis const &	site_basis,
		Index const	symmetry,
		Index const	label
	)

Generates a parity tensor \( p \) with only SU(2) symmetry, with diagonal entries 1 for states with even fermion number and -1 for states with odd fermion number.

Parameters

mpo_basis	right (and, if flipped, left) MPO basis
site_basis	upper (and, if flipped, lower) MPO basis
symmetry	number (1-indexed) of the particle number symmetry
label	label index (0-indexed) within the symmetry

References syten::MPS::genMPOId(), syten::Tensor< rank >::reduce(), and syten::MPS::Operator::uIdx.

Referenced by syten::MPS::Lat::SU2Fermion::genFermiHubbardSU2().

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