%0 Book Section %1 statphys23_0271 %A Cabra, D.C. %A Gazza, C.J. %A Dobry, A.O. %A Vekua, T. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K dimensional effects excitations fractional lattice low magnetism magnetization plateaus quantum statphys23 systems topic-8 %T Excitations with fractional spin less than 1/2 in frustrated magnetoelastic chains %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=271 %X We study the magnetic excitations on top of the plateaux states recently discovered in spin-Peierls systems in a magnetic field. We show by means of extensive density matrix renormalization group (DMRG) computations and an analytic approach that one single spin-flip on top of M=1-2/N (N=3,4,...) plateau decays into N elementary excitations each carrying a fraction 1/N of the spin. This fractionalization goes beyond the well-known decay of one magnon into two spinons taking place on top of the M=0 plateau. Concentrating on the 1/3 plateau (N=3) we unravel the microscopic structure of the domain walls which carry fractional spin-1/3, both from theory and numerics. These excitations are shown to be noninteracting and should be observable in X-ray and nuclear magnetic resonance experiments.

@incollection{statphys23_0271, abstract = {We study the magnetic excitations on top of the plateaux states recently discovered in spin-Peierls systems in a magnetic field. We show by means of extensive density matrix renormalization group (DMRG) computations and an analytic approach that one single spin-flip on top of M=1-2/N (N=3,4,...) plateau decays into N elementary excitations each carrying a fraction 1/N of the spin. This fractionalization goes beyond the well-known decay of one magnon into two spinons taking place on top of the M=0 plateau. Concentrating on the 1/3 plateau (N=3) we unravel the microscopic structure of the domain walls which carry fractional spin-1/3, both from theory and numerics. These excitations are shown to be noninteracting and should be observable in X-ray and nuclear magnetic resonance experiments.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Cabra, D.C. and Gazza, C.J. and Dobry, A.O. and Vekua, T.}, biburl = {https://www.bibsonomy.org/bibtex/263669e3a2eea473a214b6cf9a46f9f3d/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {847091611ec3829d2229e5d46f810ed2}, intrahash = {63669e3a2eea473a214b6cf9a46f9f3d}, keywords = {dimensional effects excitations fractional lattice low magnetism magnetization plateaus quantum statphys23 systems topic-8}, month = {9-13 July}, timestamp = {2007-06-20T10:16:15.000+0200}, title = {Excitations with fractional spin less than 1/2 in frustrated magnetoelastic chains}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=271}, year = 2007 }