49 citations · 159 across the 9 of their papers we have counts for
9 papers
Effective S=1/2 description of the S=1 chain with strong easy plane anisotropy
C. Psaroudaki, J. Herbrych, J. Karadamoglou +3
We present a study of the one-dimensional S=1 antiferromagnetic spin chain with large easy plane anisotropy, with special emphasis on field-induced quantum phase transitions. Tempe…
Field induced phase transitions in the helimagnet Ba2CuGe2O7
J. Chovan, M. Marder, N. Papanicolaou
We present a theoretical study of the two-dimensional spiral antiferromagnet Ba2CuGe2O7 in the presence of an external magnetic field. We employ a suitable nonlinear sigma model to…
Groebli solution for three magnetic vortices
S. Komineas, N. Papanicolaou
The dynamics of N point vortices in a fluid is described by the Helmholtz-Kirchhoff (HK) equations which lead to a completely integrable Hamiltonian system for N=2 or 3 but chaotic…
Geometry and elasticity of strips and flowers
M. Marder, N. Papanicolaou
We solve several problems that involve imposing metrics on surfaces. The problem of a strip with a linear metric gradient is formulated in terms of a Lagrangean similar to those us…
Vortex Rings and Lieb Modes in a Cylindrical Bose-Einstein Condensate
S. Komineas, N. Papanicolaou
We present a calculation of a solitary wave propagating along a cylindrical Bose-Einstein trap, which is found to be a hybrid of a one-dimensional (1D) soliton and a three-dimensio…
Intermediate phase in the spiral antiferromagnet Ba_2CuGe_2O_7
J. Chovan, N. Papanicolaou, S. Komineas
The magnetic compound Ba_2CuGe_2O_7 has recently been shown to be an essentially two-dimensional spiral antiferromagnet that exhibits an incommensurate-to-commensurate phase transi…
Magnon dispersion and thermodynamics in CsNiF_3
J. Karadamoglou, N. Papanicolaou, X. Wang +1
We present an accurate transfer matrix renormalization group calculation of the thermodynamics in a quantum spin-1 planar ferromagnetic chain. We also calculate the field dependenc…
Low-frequency spin dynamics in the orthorombic phase of La_2CuO_4
J. Chovan, N. Papanicolaou
An effective field theory is derived that describes the low-frequency spin dynamics in the low-temperature orthorombic phase of La_2CuO_4. Restricted to a single CuO_2 layer the ef…
Thermodynamics of the spin-flop transition in a quantum XYZ chain
X. Wang, X. Zotos, J. Karadamoglou +1
A special limit of an antiferromagnetic XYZ chain was recently shown to exhibit interesting bulk as well as surface spin-flop transitions at T=0. Here we provide a complete calcula…