Solitary objects on quantum spin rings

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Title: Solitary objects on quantum spin rings
Authors: Shchelokovskyy, Pavlo
Thesis advisor: Prof. Dr. Klaus Bärwinkel
apl. Prof. Dr. Heinz-Jürgen Schmidt
apl. Prof. Dr. Jürgen Schnack
Thesis referee: apl. Prof. Dr. Klaus Betzler
Abstract: We investigate whether quantum spin rings with nearest-neighbor Heisenberg or Ising exchange interactions can host solitary states. Using complete diagonalization techniques the system is described without classical or semiclassical approximation. In this case definitions used in connection with classical solitons are not applicable, one needs to redefine what solitary objects on a quantum spin system with translational symmetry ought to be. Thus, we start our contribution by defining which quantum states possess solitary character. In addition we discuss useful observables in order to visualize solitary quantum states. Then we demonstrate for various quantum spin rings that solitary quantum states indeed exist, and that they are moving around the spin ring without changing their shape in the course of time.
URL: https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2004121610
Subject Keywords: Molecular magnets; Heisenberg model; Spin rings; Solitons
Issue Date: 16-Dec-2004
Type of publication: Dissertation oder Habilitation [doctoralThesis]
Appears in Collections:FB04 - E-Dissertationen

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