4033

3810

كارشناسي ارشد

فيريك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1386

[ده]، 74، [II] ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

1396/03/02

كتابنامه

فيزيك

فيزيك

ID3810

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractWe consider a Resonating Valence Bond RVB state as a variational estimate for the ground state ofS 1 2 antiferromagnetic Heisenberg model in two dimensional square and honeycomb lattices WeUse Quantum Monte Carlo QMC simulation technique based on Metropolis algorithm and calculateenergy and spin spin correlation functions also we derive staggered magnetization and we showthere is still some magnetic order left in these lattices We show that the quantum uctuations onhoneycomb lattice are much stronger than on square lattice Our results are in good agreement withother methods such as spin wave calculation series expansion and exact diagonalization calculation In addition we calculate the low lying energy for triplet excitations in square and honeycomb latticesand we nd that the excitation spectrum is linear and gapless near k 0 on both lattices

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