Results 51 to 60 of about 4,461,222 (241)
Stability of Ferromagnetism in Hubbard models with degenerate single-particle ground states [PDF]
J. Phys. A: Math. Gen. 32 (1999) 8411-8418, 1999 A Hubbard model with a N_d-fold degenerate single-particle ground state has ferromagnetic ground states if the number of electrons is less or equal to N_d. It is shown rigorously that the local stability of ferromagnetism in such a model implies global stability: The model has only ferromagnetic ground states, if there are no single spin-flip ground ...
arxiv +1 more source
Ground state energies of antiferromagnetic lattices [PDF]
, 1980 Approximate values for the ground-state energy of one- and two-dimensional antiferromagnetic systems are determined with ceils of an even number of spins.
Broek, P.M. van den +2 more
core +4 more sources
Stable Quasicrystalline Ground States [PDF]
Journal of Statistical Physics, 1997 14 pages, Latex, 10 figures available upon request, completely revised ...
openaire +4 more sources
Remote SensingGlobal navigation satellite system (GNSS) array antenna receivers are widely used to suppress wideband interference in navigation countermeasures. However, existing array antenna receivers all adopt a digital array structure and digital beamforming ...
Zhenxing Xu +9 more
doaj +1 more source
Quantum critical point of spin-boson model and infrared catastrophe in bosonic bath [PDF]
J. Chem. Phys. 138, 174117 (2013), 2013 An analytic ground state is proposed for the unbiased spin-boson Hamiltonian, which is non-Gaussian and beyond the Silbey-Harris ground state with lower ground state energy. The infrared catastrophe in Ohmic and sub-Ohmic bosonic bath plays an important role in determining the degeneracy of the ground state.
arxiv +1 more source
Electronic ground state of Ni2+ [PDF]
The Journal of Chemical Physics, 2016 The Φ9/24 ground state of the Ni2+ diatomic molecular cation is determined experimentally from temperature and magnetic-field-dependent x-ray magnetic circular dichroism spectroscopy in a cryogenic ion trap, where an electronic and rotational temperature of 7.4±0.2 K was reached by buffer gas cooling of the molecular ion.
V. Zamudio-Bayer +7 more
openaire +4 more sources
Multiple Positive Solutions to a Kirchhoff Type Problem Involving a Critical Nonlinearity in ℝ3
Advanced Nonlinear Studies, 2017 In this paper, we investigate a class of Kirchhoff type problems in ℝ3{\mathbb{R}^{3}} involving a critical nonlinearity, namely,
Zhong Xiao-Jing, Tang Chun-Lei
doaj +1 more source
On the existence of ground states of an equation of Schrödinger–Poisson–Slater type
Comptes Rendus. Mathématique, 2021 We study the existence of ground states of a Schrödinger–Poisson–Slater type equation with pure power nonlinearity. By carrying out the constrained minimization on a special manifold, which is a combination of the Pohozaev manifold and Nehari manifold ...
Lei, Chunyu, Lei, Yutian
doaj +1 more source
Advances in Nonlinear Analysis, 2018 In even space dimensions, the initial value problems for some high-order focusing semilinear evolution equations with exponential nonlinearities are considered.
Saanouni Tarek
doaj +1 more source