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 9 of 9 for “"quantum quench"”.
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Quantum quench dynamics and entanglement
Quantum quench is a non-equilibrium process where the Hamiltonian is suddenly changed during the quantum evolution. The change can be made by spatially local perturbations (local quench) or globally switching to a completely different Hamiltonian (global quench). This thesis investigates the …
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Momentum evolution numerics of an impurity in a quantum quench
… a non-zero thermalised value and a longlived quantum mechanical oscillation around this plateau named “quantum flutter” [Mathy, Zvonarev, Demler, Nat. Phys. 2012]. We discuss revivals in the momentum of the impurity, which have been seen before but not yet thoroughly investigated. Subsequently …
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Aspects of quantum entanglement in critical and topologically ordered systems
Quantum entanglement plays an important role in characterizing the property of many-body systems and quantum field theories. In this thesis, we study the quantum entanglement in (1+1)-dimensional critical systems and (2+1)-dimensional topologically ordered phases. For (1+1)-d critical systems, we …
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The scaling behavior of the entanglement entropy in 2+1 dimensional critical systems
… 2+1 dimensional critical systems, the conformal quantum critical theories, has a universal subleading correction that likewise gives information about the underlying critical system. In addition, I address the issue of whether the dynamical entanglement entropy, the entanglement generated by a …
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Disorder-Free Localization
… memory of initial conditions after a global quantum quench. One of the defining features of the models that we study is the binary nature of the emergent disorder, related to the Z$_{2}$ degrees of freedom. This results in a qualitatively different behaviour in the strong effective disorder …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… lattices. In the first experiment, we study quenches across the Mott-insulator-to-superfluid quantum phase transition in the 3D Bose-Hubbard Model. The quench is accomplished by continuously tuning the ratio of the Hubbard energies. We observe that the degree of excitation is proportional to …
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Quantum simulation beyond periodicity: A theoretical study of the many-body and topological properties of quasiperiodic systems
… and are for instance suspected of hosting novel quantum phases of matter that could evade thermalisation. Solid-state quasicrystalline samples are inherently subject to defects, finite grain size, and constantly subject to atomic vibrations. Together, these effects hamper the observation of truly …
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Many-body localization and tensor networks
… that are frequently used in studying many-body quantum systems. Chapter 3 studies the shift-and-invert matrix product state method for obtaining highly excited states of MBL systems. Chapter 4 studies an efficient full diagonalization method using Wegner unitary gates. Chapter 5 studies the …
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AB-INITIO DYNAMICS IN STRONGLY INTERACTING MANY-BODY SYSTEMS
Understanding strongly interacting quantum many-body systems remains a key problem in modern physics due to the quantum correlations they develop, which result in highly nontrivial macroscopic phenomena which still defy our efforts of a thorough theoretical understanding, like quantum phase …