build_exchange_tensors_above()

Pair< Tensor< 4 >, Tensor< 4 > > syten::MPS::build_exchange_tensors_above	(	Basis const &	a,
		Basis const &	b,
		Basis const &	vac,
		std::vector< Pair< Index, Index > > const &	fermions
	)

Given two incoming physical bases (upper indices of MPS or MPO), builds two active site tensors switching them around.

Parameters

a	former first basis, occuring somewhere to the left of b
b	former right basis, occuring somewhere to the right of a
vac	vacuum basis, LHS basis of left active MPO component and RHS basis of right active MPO component
fermions	vector of Fermionic symmetries and labels, a pair <s,l> specifies that a state with the 0-indexed l'th label of the 1-indexed s'th symmetry odd is fermionic.

Returns

a pair of two MPO components, acting on the left and right site from above.

References syten::MPS::Operator::dInt, syten::Basis::dir, syten::Basis::flipped(), syten::genFuse(), syten::genIINode(), syten::genOONode(), syten::genSplit(), syten::Tensor< rank >::getBasis(), syten::Inc, syten::MPS::Operator::lInt, std::make_pair(), std::move(), syten::MPS::Operator::rInt, syten::split(), SYTEN_ASSERT, and syten::MPS::Operator::uInt.

Referenced by build_exchange_mpo_above().

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