Propagation of local excitations through strongly correlated quantum chains

Details Propagation of local excitations through strongly correlated quantum chains Propagation of local excitations through strongly correlated quantum chains

2011-09-15

arxiv.org/abs/1109.3392v1

Physica B 407 (2012) 729-734

Physics

Quantum Physics

18 pages, 6 figures

Scientific paper

The propagation of an external transverse magnetic signal acting locally on a 1d chain of spins generates a disturbance which runs through the system. This quantum effect can be interpreted as a classical traveling wave which contains a superposition of a large set of frequencies depending on the size of the chain. Its local amplitude fixes the size of the z-component of the spins at any location in the chain. The average and maximum value of the group velocity are determined and compared with the transmission velocity fixed by the Lieb-Robinson upper bound inequality.

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