Quantum relaxation and finite-size effects in the XY chain in... transverse field after global quenches
... collected on free-fermion models, such as on the transverse Ising chain, for which several analytical and numerical results have been recently obtained [32–45]. Qualitative features of the relaxation process can be explained with a quasi-particle (QP) picture [13,46]: The quench changes the total en ...
... collected on free-fermion models, such as on the transverse Ising chain, for which several analytical and numerical results have been recently obtained [32–45]. Qualitative features of the relaxation process can be explained with a quasi-particle (QP) picture [13,46]: The quench changes the total en ...
Dynamical Realization of Coherent Structures in Condensed Matter
... Coherence 2006 – Roma - April 21th, 2006 ...
... Coherence 2006 – Roma - April 21th, 2006 ...
Kondo-model for quantum-dots with spin
... building up when lowering temperature [12]. . . . . . . . . . . . . . . 1.2 (Color onlines) Left: Differential conductance, dI/dV , as a function of bias voltage, V , for an InAs-wire based quantum dot at T = 0.3K. The data were taken at magnetic fields perpendicular to the wire. B⊥ = 0 (thick), 0.1 ( ...
... building up when lowering temperature [12]. . . . . . . . . . . . . . . 1.2 (Color onlines) Left: Differential conductance, dI/dV , as a function of bias voltage, V , for an InAs-wire based quantum dot at T = 0.3K. The data were taken at magnetic fields perpendicular to the wire. B⊥ = 0 (thick), 0.1 ( ...
Sinyatkin
... The FCC-ee lattice has been represented by a transfer line multiplied 10 times to average the betatron phase. Then a particle is launched with nx amplitude and at this trajectory calculated the radiation integrals. Zero amplitude particle obviously produced pure dipole integrals which correspond ex ...
... The FCC-ee lattice has been represented by a transfer line multiplied 10 times to average the betatron phase. Then a particle is launched with nx amplitude and at this trajectory calculated the radiation integrals. Zero amplitude particle obviously produced pure dipole integrals which correspond ex ...
Applied Gauge/Gravity Duality from Supergravity to Superconductivity Francesco Aprile
... Organization of the Thesis The sequence of chapters can be divided into three blocks. • The first block contains the introductory chapters. In chapter 1 we illustrate the problem of the high-Tc superconductors making a parallelism between the Fermi Liquid theory, the BCS theory of superconductivity ...
... Organization of the Thesis The sequence of chapters can be divided into three blocks. • The first block contains the introductory chapters. In chapter 1 we illustrate the problem of the high-Tc superconductors making a parallelism between the Fermi Liquid theory, the BCS theory of superconductivity ...
Variational Monte Carlo studies of Atoms - DUO
... The aim of this thesis is to study the binding energy of atoms. Atoms of interest in this work are helium, beryllium, neon, magnesium and silicon. The smallest of all atoms, the hydrogen atom, consists of a nucleus of charge e and one electron with charge −e. The size of this atom is approximately t ...
... The aim of this thesis is to study the binding energy of atoms. Atoms of interest in this work are helium, beryllium, neon, magnesium and silicon. The smallest of all atoms, the hydrogen atom, consists of a nucleus of charge e and one electron with charge −e. The size of this atom is approximately t ...
Low-energy fixed points of random Heisenberg models Y.-C. Lin R. Me´lin
... The dimerized model is then described by the Hamiltonian H⫽H 1 ⫹H dim and has a layered structure, see Fig. 1共b兲. Its phase diagram is shown in Fig. 2共b兲 as a function of the dimerization parameter 0⬍ ␣ ⬍1. For ␣ ⬍ ␣ c ⫽0.686 the ground state has AF LRO, whereas for ␣ ⬎ ␣ c the system is in an order ...
... The dimerized model is then described by the Hamiltonian H⫽H 1 ⫹H dim and has a layered structure, see Fig. 1共b兲. Its phase diagram is shown in Fig. 2共b兲 as a function of the dimerization parameter 0⬍ ␣ ⬍1. For ␣ ⬍ ␣ c ⫽0.686 the ground state has AF LRO, whereas for ␣ ⬎ ␣ c the system is in an order ...
Renormalization
In quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, renormalization is any of a collection of techniques used to treat infinities arising in calculated quantities.Renormalization specifies relationships between parameters in the theory when the parameters describing large distance scales differ from the parameters describing small distances. Physically, the pileup of contributions from an infinity of scales involved in a problem may then result in infinities. When describing space and time as a continuum, certain statistical and quantum mechanical constructions are ill defined. To define them, this continuum limit, the removal of the ""construction scaffolding"" of lattices at various scales, has to be taken carefully, as detailed below.Renormalization was first developed in quantum electrodynamics (QED) to make sense of infinite integrals in perturbation theory. Initially viewed as a suspect provisional procedure even by some of its originators, renormalization eventually was embraced as an important and self-consistent actual mechanism of scale physics in several fields of physics and mathematics. Today, the point of view has shifted: on the basis of the breakthrough renormalization group insights of Kenneth Wilson, the focus is on variation of physical quantities across contiguous scales, while distant scales are related to each other through ""effective"" descriptions. All scales are linked in a broadly systematic way, and the actual physics pertinent to each is extracted with the suitable specific computational techniques appropriate for each.