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numerical simulations of strongly correlated electron and spin systems
numerical simulations of strongly correlated electron and spin systems

... First of all, I would like to thank my advisor Professor Christopher Henley for his excellent guidance and support during my Ph.D. His dedication and commitment to scientific research are exemplary and have influenced me greatly. His vast breadth of knowledge, tremendous physical insights and unique ...
FrustrationVSFactorization - School of Mathematical Sciences
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... a few simple subcases (Ising, XY,...) and now a wider class of models with nearest-neighbor interactions (see JE) • Difficult to be determined even numerically, especially for high-dimensional lattices (2D, 3D, ...) • Rich phenomenology: different magnetic orderings, critical points and quantum phas ...
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... Golterman and Y. Shamir, Phys. Rev. D 68, 074501 (2003), V. Weinberg, E.-M. Ilgenfritz, et.al, PoS { LAT2005}, 171 (2005), hep-lat 0705.0018, I. Horvath, N. Isgur, J. McCune, and H. B. Thacker, Phys. Rev. D65, 014502 (2002), J. Greensite, S. Olejnik et.al., Phys. Rev. D71, 114507 (2005). V. G. Borny ...
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Seminar Quantum Field Theory - Institut für Theoretische Physik III
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... freedom, which can also be used to define pseudospins12,13. A natural and important question is whether such new types of pseudospins can be employed to generate SMC. In optical lattices filled with ultracold atoms, s- and p-orbital bands are separated by a large energy gap and can be defined as two ps ...
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Quantum Biological Switch Based on Superradiance Transitions
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The Coulomb-interaction-induced breaking of the Aufbau principle

... micrometres that can confine charge carriers (conduction band electrons and/or valence band holes) in all three directions. This kind of confinement leads to energy quantization and gives a discrete spectrum of energy levels. This is an analog of discrete spectrum of natural atoms and thus quantum d ...
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Ising model

The Ising model (/ˈaɪsɪŋ/; German: [ˈiːzɪŋ]), named after the physicist Ernst Ising, is a mathematical model of ferromagnetism in statistical mechanics. The model consists of discrete variables that represent magnetic dipole moments of atomic spins that can be in one of two states (+1 or −1). The spins are arranged in a graph, usually a lattice, allowing each spin to interact with its neighbors. The model allows the identification of phase transitions, as a simplified model of reality. The two-dimensional square-lattice Ising model is one of the simplest statistical models to show a phase transition.The Ising model was invented by the physicist Wilhelm Lenz (1920), who gave it as a problem to his student Ernst Ising. The one-dimensional Ising model has no phase transition and was solved by Ising (1925) himself in his 1924 thesis. The two-dimensional square lattice Ising model is much harder, and was given an analytic description much later, by Lars Onsager (1944). It is usually solved by a transfer-matrix method, although there exist different approaches, more related to quantum field theory.In dimensions greater than four, the phase transition of the Ising model is described by mean field theory.
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