Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Spinsystem"'
Autor:
Keim, Frederik
In this thesis a method for deriving effective models for one-dimensional spin systems is introduced. It is based on matrix product state (MPS) and exploits translation invariance to efficiently work in the thermodynamic limit. It is tested on two an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18d9797cf1480b0a6306c28dec7c7ece
Autor:
Powalski, Michael
In this thesis the elementary excitations of the spin-1=2 Heisenberg antiferromagnet on the square lattice are studied. This fundamental model is a paradigmatic example for long range ordered quantum phases and the spontaneous breaking of a continuou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ec522cd4598f4940225c420090cc96b
Autor:
Fauseweh, Benedikt
In this thesis we investigate dynamical correlations of spin systems at finite temperature. Especially we focus on the anomalous decoherence effects found previously in experiments of several quantum magnets. We develop and apply a diagrammatic pertu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acd913ccc434d8172157fa55d5924ea9
Autor:
Ciaramella, Gabriele
An efficient and accurate computational framework for solving control problems governed by quantum spin systems is presented. Spin systems are extremely important in modern quantum technologies such as nuclear magnetic resonance spectroscopy, quantum
Autor:
Ciaramella, Gabriele
An efficient and accurate computational framework for solving control problems governed by quantum spin systems is presented. Spin systems are extremely important in modern quantum technologies such as nuclear magnetic resonance spectroscopy, quantum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______713::c2bb00af9c22c87278b637895d315567
https://opus.bibliothek.uni-wuerzburg.de/files/11838/PhD_Thesis_Ciaramella_Gabriele.pdf
https://opus.bibliothek.uni-wuerzburg.de/files/11838/PhD_Thesis_Ciaramella_Gabriele.pdf
Autor:
Fischer, Tim
In sufficiently dimerized quantum antiferromagnets the elementary excitations are given by gapped spin S = 1 triplon quasiparticles. Although these triplons are protected by a gap at low energies they may decay spontaneously at higher energies where
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc07dcd5a78a7c764117ffd266162dec
Autor:
Thomale, Ronny
Zugl.: Karlsruhe, Univ., Diss., 2008
Externí odkaz:
http://d-nb.info/992564492/04
Autor:
Brünger, Christian
Der erste Teil der Arbeit widmet sich der Untersuchung des Bilayer-Heisenberg-Modells und des zweidimensionalen Kondo-Necklace-Modells. Beide Modelle weisen einen Quantenphasenübergang zwischen einer geordneten und einer ungeordneten Phase auf. In d
Autor:
Brünger, Christian
Der erste Teil der Arbeit widmet sich der Untersuchung des Bilayer-Heisenberg-Modells und des zweidimensionalen Kondo-Necklace-Modells. Beide Modelle weisen einen Quantenphasenübergang zwischen einer geordneten und einer ungeordneten Phase auf. In d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______713::60cbc469b8b349485551869ab87a6b9c
https://opus.bibliothek.uni-wuerzburg.de/files/2265/BruengerDiss.pdf
https://opus.bibliothek.uni-wuerzburg.de/files/2265/BruengerDiss.pdf
Autor:
Kaul, Enrique Eduardo
In this dissertation we reported our experimental investigation of the magnetic properties of nine low-dimensional vanadium compounds. Two of these materials are completely new (Pb2V5O12 and Pb2VO(PO4)2) and were found during our search for new low-d
Externí odkaz:
https://tud.qucosa.de/id/qucosa%3A23572
https://tud.qucosa.de/api/qucosa%3A23572/attachment/ATT-0/
https://tud.qucosa.de/api/qucosa%3A23572/attachment/ATT-0/