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題名 Strong disorder renormalization group study of S=1/2 Heisenberg antiferromagnet layers and bilayers with bond randomness, site dilution and dimer dilution
作者 林瑜琤
Lin, Yu-Cheng ; Robert Juhasz; Ferenc Igloi
貢獻者 應物所
日期 2006-07
上傳時間 1-May-2014 17:50:32 (UTC+8)
摘要 Using a numerical implementation of a strong-disorder renormalization group, we study the low-energy, long-distance properties of layers and bilayers of S=1/2 Heisenberg antiferromagnets with different types of disorder: bond randomness, site dilution, and dimer dilution. Generally the systems exhibit an ordered and a disordered phase separated by a phase boundary on which the static critical exponents appear to be independent of bond randomness in the strong-disorder regime, while the dynamical exponent is a continuous function of the bond disorder strength. The low-energy fixed points of the off-critical phases are affected by the actual form of the disorder, and the disorder-induced dynamical exponent depends on the disorder strength. As the strength of the bond disorder is increased, there is a set of crossovers in the properties of the low-energy singularities. For weak disorder quantum fluctuations play the dominant role. For intermediate disorder nonlocalized disorder fluctuations are relevant, which become localized for even stronger bond disorder. We also present some quantum Monte Carlo simulation results to support the strong-disorder renormalization approach.
關聯 Physical Review B, 74(2), 024427(1-12)
資料類型 article
dc.contributor 應物所en_US
dc.creator (作者) 林瑜琤zh_TW
dc.creator (作者) Lin, Yu-Cheng ; Robert Juhasz; Ferenc Igloien_US
dc.date (日期) 2006-07en_US
dc.date.accessioned 1-May-2014 17:50:32 (UTC+8)-
dc.date.available 1-May-2014 17:50:32 (UTC+8)-
dc.date.issued (上傳時間) 1-May-2014 17:50:32 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/65807-
dc.description.abstract (摘要) Using a numerical implementation of a strong-disorder renormalization group, we study the low-energy, long-distance properties of layers and bilayers of S=1/2 Heisenberg antiferromagnets with different types of disorder: bond randomness, site dilution, and dimer dilution. Generally the systems exhibit an ordered and a disordered phase separated by a phase boundary on which the static critical exponents appear to be independent of bond randomness in the strong-disorder regime, while the dynamical exponent is a continuous function of the bond disorder strength. The low-energy fixed points of the off-critical phases are affected by the actual form of the disorder, and the disorder-induced dynamical exponent depends on the disorder strength. As the strength of the bond disorder is increased, there is a set of crossovers in the properties of the low-energy singularities. For weak disorder quantum fluctuations play the dominant role. For intermediate disorder nonlocalized disorder fluctuations are relevant, which become localized for even stronger bond disorder. We also present some quantum Monte Carlo simulation results to support the strong-disorder renormalization approach.en_US
dc.format.extent 825995 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) Physical Review B, 74(2), 024427(1-12)en_US
dc.title (題名) Strong disorder renormalization group study of S=1/2 Heisenberg antiferromagnet layers and bilayers with bond randomness, site dilution and dimer dilutionen_US
dc.type (資料類型) articleen