68,519 research outputs found
Family of exactly solvable models with an ultimative quantum paramagnetic ground state
We present a family of two-dimensional frustrated quantum magnets solely
based on pure nearest-neighbor Heisenberg interactions which can be solved
quasi-exactly. All lattices are constructed in terms of frustrated quantum
cages containing a chiral degree of freedom protected by frustration. The
ground states of these models are dubbed ultimate quantum paramagnets and
exhibit an extensive entropy at zero temperature. We discuss the unusual and
extensively degenerate excitations in such phases. Implications for
thermodynamic properties as well as for decoherence free quantum computation
are discussed
Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors
Based on a two-dimensional model of coupled two-leg spin ladders, we derive a
unified picture of recent neutron scattering data of stripe-ordered
La_(15/8)Ba_(1/8)CuO_4, namely of the low-energy magnons around the
superstructure satellites and of the triplon excitations at higher energies.
The resonance peak at the antiferromagnetic wave vector Q_AF in the
stripe-ordered phase corresponds to a saddle point in the dispersion of the
magnetic excitations. Quantitative agreement with the neutron data is obtained
for J= 130-160 meV and J_cyc/J = 0.2-0.25.Comment: 4 pages, 4 figures included updated version taking new data into
account; factor in spectral weight corrected; Figs. 2 and 4 change
Model estimation and identification of manual controller objectives in complex tracking tasks
A methodology is presented for estimating the parameters in an optimal control structural model of the manual controller from experimental data on complex, multiinput/multioutput tracking tasks. Special attention is devoted to estimating the appropriate objective function for the task, as this is considered key in understanding the objectives and strategy of the manual controller. The technique is applied to data from single input/single output as well as multi input/multi outpuut experiments, and results discussed
Effective models for gapped phases of strongly correlated quantum lattice models
We present a robust scheme to derive effective models non-perturbatively for
quantum lattice models when at least one degree of freedom is gapped. A
combination of graph theory and the method of continuous unitary
transformations (gCUTs) is shown to efficiently capture all zero-temperature
fluctuations in a controlled spatial range. The gCUT can be used either for
effective quasi-particle descriptions or for effective low-energy descriptions
in case of infinitely degenerate subspaces. We illustrate the method for 1d and
2d lattice models yielding convincing results in the thermodynamic limit. We
find that the recently discovered spin liquid in the Hubbard model on the
honeycomb lattice lies outside the perturbative strong-coupling regime. Various
extensions and perspectives of the gCUT are discussed.Comment: 6 pages, 5 figures, extended discussion on J2/J1 for the honeycomb
Hubbard model and on the properties of different generators for the
continuous unitary transformatio
- …