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37 papers · 1 filter
Magnetic properties of doped Heisenberg chains
Holger Frahm, Nikita A. Slavnov
The magnetic susceptibility of systems from a class of integrable models for doped spin- Heisenberg chains is calculated in the limit of vanishing magnetic field. For small conc…
Closed N=2 Strings: Picture-Changing, Hidden Symmetries and SDG Hierarchy
Olaf Lechtenfeld, Alexander D. Popov
We study the action of picture-changing and spectral flow operators on a ground ring of ghost number zero operators in the chiral BRST cohomology of the closed N=2 string and descr…
Probing the statistical properties of Bose-Einstein condensates with light
Z. Idziaszek, K. Rzazewski, M. Lewenstein
A scattering of short, weak, nonresonant laser pulses on a Bose-Einstein condensate is proposed as a tool for studying its statistical properties. We show in particular that the va…
Separability in 2xN composite quantum systems
B. Kraus, J. I. Cirac, S. Karnas +1
We analyze the separability properties of density operators supported on $\C^2\otimes \C^N$ whose partial transposes are positive operators. We show that if the rank of equals…
Ward identities and the vanishing theorem for loop amplitudes of the closed N=2 string
Klaus Junemann, Olaf Lechtenfeld
The existence of a ground ring of ghost number zero operators in the chiral BRST cohomology of the N=2 string is used to derive an infinite set of Ward identities for the closed-st…
Dark Solitons in Bose-Einstein Condensates
S. Burger, K. Bongs, S. Dettmer +5
Dark solitons in cigar shaped Bose-Einstein condensates of Rubidium-87 are created by a phase imprinting method. Coherent and dissipative dynamics of the solitons has been observed…