genRepsU1()

std::vector< Rep > syten::genRepsU1	(	RDef	start,
		Index	number = 0,
		char	phys = 'c',
		Fermionic	ferm = Fermionic::Never
	)

Generate a specific number of unique \( U(1) \) irreps with the specified physical symmetry description.

Parameters

start	label of the first irrep. Suggested value is either \( -S_z\) if it is a spin symmetry or \( 0 \) if it is a charge symmetry.
number	number of irreps to generate. If number is 0 and start is negative, generate irreps [start, start+1, …, -start]. If number is 0 and start is 0 or greater, generate [start, start+1].
phys	physical symmetry description
ferm	fermionic spec for the to-be-generated IREP(s)

Returns

a vector of \( U(1) \) irreps belonging to the specified physical symmetry description

Example\n

• genRepsU1(-2.5, 0, "Sz") → [U(1)_Sz:[-2.5]@1, U(1)_Sz:[-1.5]@1, U(1)_Sz:[-0.5]@1, U(1)_Sz:[0.5]@1, U(1)_Sz:[1.5]@1, U(1)_Sz:[2.5]@1]
• genRepsU1(0, 3, "N") → [U(1)_N:[0]@1, U(1)_N:[1]@1, U(1)_N:[2]@1]

Referenced by syten::MPS::Lat::U1::genBosonLattice(), syten::MPS::Lat::U1::genFermiLattice(), syten::IPEPS::Lat::U1::genFermiSpinless(), syten::IPEPS::Lat::U1::genSpinDisorder(), syten::MPS::Lat::U1::genSpinDisorderLattice(), syten::IPEPS::Lat::U1::genSpinKagomeSquare(), syten::MPS::Lat::GCE::U1::genSpinLattice(), syten::MPS::Lat::U1::genSpinLattice(), and syten::IPEPS::Lat::U1::genSpinLattice().

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