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pro vyhledávání: '"Fledderjohann, Andreas"'
A systematic and compact treatment of arbitrary $su(2)$ invariant spin-$s$ quantum chains with nearest-neighbour interactions is presented. The ground-state is derived in terms of matrix product states (MPS). The fundamental MPS calculations consist
Externí odkaz:
http://arxiv.org/abs/1603.07769
Autor:
Fledderjohann, Andreas.
Wuppertal, University, Habil.-Schr., 2000.
Externí odkaz:
http://www.bib.uni-wuppertal.de/elpub/fb08/habi2001/fledderjohann/h080101.pdf
http://deposit.ddb.de/cgi-bin/dokserv?idn=964224852
http://deposit.ddb.de/cgi-bin/dokserv?idn=964224852
We report on a systematic implementation of su(2) invariance for matrix product states (MPS) with concrete computations cast in a diagrammatic language. As an application we present a variational MPS study of $su(2)$ invariant quantum spin systems. F
Externí odkaz:
http://arxiv.org/abs/1107.5258
Autor:
Fledderjohann, Andreas, Gros, Claudius
Publikováno v:
Europhys. Lett. Vol. 37, p189 (1997)
We study numerically the dimerized Heisenberg model with frustration appropriate for the quasi-1D spin-Peierls compound CuGeO$_3$. We present evidence for a bound state in the dynamical structure factor for any finite dimerization $\delta$ and estima
Externí odkaz:
http://arxiv.org/abs/cond-mat/9612013