Numerical Study for the Ground State of Multi-Orbital Hubbard Models
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概要
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Ground state properties of mtrlti-orbital Htubbard models atre investigarted by the atrxiliary fieldqtuantuun lVIonte Carlo naethod. A lVIonte Carlo techniqtne generalized to the natrlti-orbital systemsis introduced and exarnined in detail. The algorithz'rr cozatains non-trivial cases where the negativesign problem does not exist. We investigate one-dinaension?tl systems with dotrbly degenerateorbitals by this new techniqtre. Properties of' the Mott insttlating state are quantitatively clarifiedas the strongly correlated insttlator, where the charge gap arnplittrde is nutmch larger than the spingap. The insulator-naetal transitions driven by the chemical potential shows a universality classwith the correlation length exponent v : 172, which is consistent with the scaling argtrtaaents,Increasing level split between two orbitals drives crossover f'rorn the lVIott insttlator with highspin state to the band insulator with low spin staxte, xvhere the spin gap anaplittude increases andbecomes closer to the charge gap. Experiznental relevance of otrr restrlts especially to Haldanematerials is discussed.
- 社団法人日本物理学会の論文
- 1998-09-15
著者
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Motome Yukitoshi
Department Of Applied Physics University Of Tokyo
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Motome Yukitoshi
Department Of Physics Tokyo Institute Of Technology
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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