Criticality in Quantum Dissipative Systems
Doctoral thesis
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Date
2012Metadata
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- Institutt for fysikk [2771]
Abstract
This thesis consists of five scientific papers in the field of condensed matter physics. In all papers we employ large scale Monte Carlo simulations to investigate quantum critical behavior in systems coupled to an environment. Special attention is paid to possible anisotropies between spatial fluctuations and fluctuations in imaginary time. Implications of the results to the loop current theory of cuprates are discussed.
Has parts
Sperstad, Iver Bakken; Stiansen, Einar B.; Sudbo, Asle. Monte Carlo simulations of dissipative quantum Ising models. Physical Review B. Condensed Matter and Materials Physics. (ISSN 1098-0121). 81(10): 104302, 2010. 10.1103/PhysRevB.81.104302.Stiansen, Einar B.; Sperstad, Iver Bakken; Sudbo, Asle. Criticality of compact and noncompact quantum dissipative Z(4) models in (1+1) dimensions. Physical Review B. Condensed Matter and Materials Physics. (ISSN 1098-0121). 83(11): 115134, 2011. 10.1103/PhysRevB.83.115134.
Sperstad, Iver Bakken; Stiansen, Einar B.; Sudbo, Asle. Quantum criticality in a dissipative (2+1)-dimensional XY model of circulating currents in high-T-c cuprates. Physical Review B. Condensed Matter and Materials Physics. (ISSN 1098-0121). 84(18): 180503, 2011. 10.1103/PhysRevB.84.180503.
Stiansen, Einar B.; Sperstad, Iver Bakken; Sudbo, Asle. Three distinct types of quantum phase transitions in a (2+1)-dimensional array of dissipative Josephson junctions. Physical Review B. Condensed Matter and Materials Physics. (ISSN 1098-0121). 85(22): 224531, 2012. 10.1103/PhysRevB.85.224531.
Sperstad, Iver Bakken; Stiansen, Einar B.; Sudbo, Asle. Quantum criticality in spin chains with non-Ohmic dissipation. Physical Review B. Condensed Matter and Materials Physics. (ISSN 1098-0121). 85(21): 214302, 2012. 10.1103/PhysRevB.85.214302.