Results 71 to 80 of about 428,741 (193)

Spin and thermal conductivity in a classical disordered spin chain [PDF]

Physical Review B, 2015
5 pages, 5 ...
Jenčič, Boštjan, Prelovšek, Peter
openaire   +2 more sources

Dipolar Spin Correlations in Classical Pyrochlore Magnets [PDF]

Physical Review Letters, 2004
4 pages ...
Isakov, S. V., Gregor, K., Moessner, R., Sondhi, S. L.   +3 more
openaire   +4 more sources

Effective action and semiclassical limit of spin foam models

, 2011
We define an effective action for spin foam models of quantum gravity by adapting the background field method from quantum field theory. We show that the Regge action is the leading term in the semi-classical expansion of the spin foam effective action ...
A Miković, Abbot L, Baez J C, Barrett J W, Barrett J W, Barrett J W Dowdall R J Fairbairn W J Hellmann F Pereira R, Bianchi E, Fairbairn W Meusburger C, Freidel L, M Vojinović, Magliaro E, Makela J, Miković A, Miković A, Miković A, Miković A Vojinović M, Miković A Vojinović M   +16 more
core   +1 more source

Classical aspects of quantum spin chains

Physical Review Letters, 1989
We suggest a new variational approach for quantum spin chains, based on the stochastic behavior of the quantization axes, which describes a chain in terms of a classical and a quantum contribution to the free energy. For an easy-plane ferromagnetic chain with the external field in the plane it reveals that the nonlinear excitations are predominantly ...
Lemmens, L. F., Kopinga, K., De Jonge, W.J.M.   +2 more
openaire   +2 more sources

Quantum Dynamics in Classical Spin Baths

, 2013
A formalism for studying the dynamics of quantum systems embedded in classical spin baths is introduced. The theory is based on generalized antisymmetric brackets and predicts the presence of open-path off-diagonal geometric phases in the evolution of ...
Sergi, Alessandro
core   +1 more source

Nonlinear semi-classical 3D quantum spin

Journal of Physics Communications, 2019
In an effort to provide an alternative method to represent a quantum spin, a precise 3D nonlinear dynamics method is used. A two-sided torque function is created to mimic the unique behavior of the quantum spin. A full 3D representation of the magnetic field of a Stern-Gerlach device was used as in the original experiment.
J J Heiner, J D Bodyfelt, D R Thayer
openaire   +2 more sources

Quantum-to-classical crossover in the spin glass dynamics of cavity QED simulators

Physical Review Research
By solving the quench dynamics of a frustrated many-body spin-boson problem, we investigate the role of spin size on the dynamical formation of spin-glass order. In particular, we observe that quantum and classical spin glasses exhibit markedly different
Hossein Hosseinabadi, Darrick E. Chang, Jamir Marino   +2 more
doaj   +1 more source

The fuzzy 4-hyperboloid Hn4 and higher-spin in Yang–Mills matrix models

Nuclear Physics B, 2019
We consider the SO(4,1)-covariant fuzzy hyperboloid Hn4 as a solution of Yang–Mills matrix models, and study the resulting higher-spin gauge theory. The degrees of freedom can be identified with functions on classical H4 taking values in a higher-spin ...
Marcus Sperling, Harold C. Steinacker
doaj   +1 more source

Quantum Nature of Edge Magnetism in Graphene

, 2014
It is argued that the subtle crossover from decoherence-dominated classical magnetism to fluctuation-dominated quantum magnetism is experimentally accessible in graphene nanoribbons.
Golor, Michael, Schmidt, Manuel J., Wessel, Stefan   +2 more
core   +1 more source

Grassmann techniques applied to classical spin systems

Condensed Matter Physics, 2009
We review problems involving the use of Grassmann techniques in the field of classical spin systems in two dimensions. These techniques are useful to perform exact correspondences between classical spin Hamiltonians and field-theory fermionic actions ...
M. Clusel, J.-Y. Fortin
doaj   +1 more source