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We develop a simple and unbiased numerical method to obtain the uniformsusceptibility of quantum many body systems. When a Hamiltonian is spatiallydeformed by multiplying it with a sine square function that smoothly decreasesfrom the system center toward the edges, the size-scaling law of the excitationenergy is drastically transformed to a rapidly converging one. Then, the localmagnetization at the system center becomes nearly size independent; the oneobtained for the deformed Hamiltonian of a system length as small as L=10provides the value obtained for the original uniform Hamiltonian of L=100. Thisallows us to evaluate a bulk magnetic susceptibility by using the magnetizationat the center by existing numerical solvers without any approximation,parameter tuning, or the size-scaling analysis. We demonstrate that thesusceptibilities of the spin-1/2 antiferromagnetic Heisenberg chain and squarelattice obtained by our scheme at L=10 agree within 10 to (-3) with exactanalytical and numerical solutions for L=infinite down to temperature of 0.1times the coupling constant. We apply this method to the spin-1/2 kagomelattice Heisenberg antiferromagnet which is of prime interest in the search ofspin liquids.

physical review. b./physical review. b

Magnetic susceptibility of quantum spin systems calculated by sine  square deformation: one-dimensional, square lattice, and kagome lattice  Heisenberg antiferromagnets