Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Bethe Ansatz"”.
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Modelo de Lieb-Liniger
… no limite termodinâmico usando o método de Bethe-Ansatz. Também se estuda algumas implicações experimentais atuais oriundas da solução deste modelo.
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Dynamical correlations of S=1/2 quantum spin chains
… analytical techniques such as bosonization and Bethe ansatz, the standard approach fails in the calculation of some time-dependent correlation functions. I present a study of the longitudinal dynamical structure factor for the XXZ model in the critical regime. I show that an approximation for …
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Studies of Integrable One-Dimensional Quantum Systems
In this thesis, I use the Bethe Ansatz (BA) to study various one-dimensional models. I first go through some background on the BA (both the coordinate and algebraic forms). I start the study by using the BA to compare bound state occurrences between the 2-particle XXZ, Bose–Hubbard, and Fermi– …
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The Transition Probability of the Inhomogeneous q-TAZRP
… while in [K-L] they are identical. We use the Bethe ansatz to derive an integral formula for the transition probability for the n-particle system, which reduces to the formula in [K-L] if all the conductance parameters are identically 1. Our result is comparable to the result obtained by …
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Anomalous quantum dynamics in scarred and integrable systems
… the central spin-1 XX model by constructing its Bethe ansatz eigenstates and an extensive set of conserved charges. These charges prevent the central spin from thermalizing in quantum quenches. Secondly, using an irreducible tensor operator basis, we describe an approach to construct exhaustive …
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Método atômico para o modelo de Anderson em presença de um campo magnético externo.
… compared with those obtained by means of the Bethe ansatz (BA) for the Kondo model. In the Kondo regime the agreement between the BA and the AM is good, however in the boundary between the Kondo and the mixed valence regime the results differ because the charge fluctuations in the Anderson …
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Low Energy Excitations of 1D Fermi Gases
… side, confirming expectations from exact Bethe ansatz solutions for the homogeneous gas at zero temperature, in which weakly bound fermion pairs are predicted. The result presented here provides insight into physics in one dimension, an important realm that is well known to host many …
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Lie algebraic structures in integrable models, affine Toda field theory
… the first part. By means of the thermodyna mic Bethe ansatz the central charges of the ultraviolet conformal field theories are calculated and in case of affine Toda theories also the first order term in the scaling function is analytically obtained. For the colour valued S-matrices the …
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cell motility and machine learning
… and it shows excellent agreement with the Bethe-Ansatz exact solution. Furthermore, we also calculate the loop correlation function using the wave function obtained.
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Entanglement entropy in quantum many particle systems and their simulation via ansatz states
… are approximated within a certain class of ansatz states. These ansatz states are designed in a way that the number of degrees of freedom are prevented from growing exponentially. With the DMRG method, ground states of interacting one-dimensional systems can often be determined with very …
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Analiza splątania układów kwantowych dla ścisłych rozwiązań podstawienia Bethego
… możemy otrzymać poprzez tzw. podstawienie Bethego. Formalne podobieństwo (w sensie struktury multiliniowej) do komputerów kwantowych powoduje iż magnetyk ten staje się niezwykle ciekawym obiektem z punktu widzenia kwantowego przetwarzania informacji. W niniejszej rozprawie podano dwa …
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Exact Results on Extended Hubbard Models on One-Dimensional Chains
This PhD thesis is concerned with the investigation of Extended Hubbard Models on one-dimensional lattices (chains); the approach used to such investigation is that of determining exact results. The extended Hubbard models are models of correlated electrons on lattices; they are the extensions of a …
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Escadas de spin integráveis
… são exatamente solúveis através do método do ansatz de Bethe e as equações do ansatz de Bethe, os autovalores de energia e o gap de spin são derivados e propriedades físicas interessantes são discutidas. Inicialmente apresentamos um modelo de escada de spin integrável que possui um parâmetro …