منابع مشابه
Vortices in Quantum Spin Systems
We examine spin vortices in ferromagnetic quantum Heisenberg models with planar anisotropy on two–dimensional lattices. The symmetry properties and the time evolution of vortices built up from spin–coherent states are studied in detail. Although these states show a dispersion typical for wave packets, important features of classical vortices are conserved. Moreover, the results on symmetry prop...
متن کاملDecoherence in quantum spin systems
Computer simulations of decoherence in quantum spin systems require the solution of the time-dependent Schrödinger equation for interacting quantum spin systems over extended periods of time. We use exact diagonalization, the Chebyshev polynomial technique, four Suzuki-formula algorithms, and the short-iterative-Lanczos method to solve a simple model for decoherence of a quantum spin system by ...
متن کاملQuantum Spin Systems
The theory of quantum spin systems is concerned with properties of quantum systems with an infinite number of degrees of freedom that each have a finite-dimensional state space. Occasionaly, one is specifically interested in finite systems. In the most common examples one has an ndimensional Hilbert space associated with each site of a d-dimensional lattice. A model is normally defined by descr...
متن کاملQuantum vortices in optical lattices
A vortex in a superfluid gas inside an optical lattice can behave as a massive particle moving in a periodic potential and exhibiting quantum properties. In this Letter we discuss these properties and show that the excitation of vortex motions in a two-dimensional lattice can lead to striking measurable changes in its dynamic response. It would be possible by means of Bragg spectroscopy to carr...
متن کاملElementary excitations in gapped quantum spin systems.
For quantum lattice systems with local interactions, the Lieb-Robinson bound serves as an alternative for the strict causality of relativistic systems and allows the proof of many interesting results, in particular, when the energy spectrum exhibits an energy gap. In this Letter, we show that for translation invariant systems, simultaneous eigenstates of energy and momentum with an eigenvalue t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal B
سال: 1999
ISSN: 1434-6028
DOI: 10.1007/s100510050762