Kyriakidis, J. and Loss, D.. (1998) Bloch oscillations of magnetic solitons in anisotropic spin1/2 chains. Physical Review B, Vol. 58, H. 9. pp. 55685583.
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Official URL: http://edoc.unibas.ch/dok/A5254761
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Abstract
We study the quantum dynamics of solitonlike domain walls in anisotropic spin1/2 chains in the presence of magnetic fields. In the absence of fields, domain walls form a Bloch band of delocalized quantum states while a static field applied along the easy axis localizes them into Wannier wave packets and causes them to execute Bloch oscillations, i.e., the domain walls oscillate along the chain with a finite Bloch frequency and amplitude. In the presence of the field, the Bloch band, with a continuum of extended states, breaks up into the WannierZeeman laddera discrete set of equally spaced energy levels. We calculate the dynamical structure factor SZZ(q,omega) in the onesoliton sector at finite frequency, wave vector, and temperature, and find sharp peaks at frequencies which are integer multiples of the Bloch frequency. We further calculate the uniform magnetic susceptibility and find that it too exhibits peaks at the Bloch frequency. We identify several candidate materials where these Bloch oscillations should be observable, for example, via neutronscattering measurements. For the particular compound CoCl2.2H(2)O we estimate the Bloch amplitude to be on the order of a few lattice constants, and the Bloch frequency on the order of 100 GHz for magnetic fields in the Tesla range and at temperatures of about 18 K.
Faculties and Departments:  05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss) 

UniBasel Contributors:  Loss, Daniel 
Item Type:  Article, refereed 
Article Subtype:  Research Article 
Publisher:  American Institute of Physics 
ISSN:  01631829 
Note:  Publication type according to Uni Basel Research Database: Journal article 
Identification Number: 

Last Modified:  22 Mar 2012 14:25 
Deposited On:  22 Mar 2012 13:48 
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