Zobrazeno 1 - 10
of 986
pro vyhledávání: '"Hyman, R"'
A deterministic Bohmian mechanics for operators with continuous and discrete spectra is presented. Randomness enters only through initial conditions. Operators with discrete spectra are incorporated into Bohmian mechanics by associating with each ope
Externí odkaz:
http://arxiv.org/abs/quant-ph/0401008
Simple derivations, at a level appropriate for an undergraduate computational physics course, of the most popular methods for finding the minimum of a function of many variables are presented in a unified manner in the context of a general optimizati
Externí odkaz:
http://arxiv.org/abs/physics/0307119
Autor:
Yang, Kun, Hyman, R. A.
Publikováno v:
Phys. Rev. Lett. 84, 2044 (2000).
In a recent Letter (PRL 83, 3297 (1999)), Hida presented numerical results indicating that the Haldane phase of the Heisenberg antiferromagnetic spin-1 chain is stable against bond randomness, for box distributions of the bond strength, even when the
Externí odkaz:
http://arxiv.org/abs/cond-mat/9911170
The thickness evolution of in-plane magnetization reversal in ultrathin films is studied with a theoretical model that takes account of surface roughness typical of epitaxial growth. Guided by N\'{e}el's model, step edge sites of monolayer-height isl
Externí odkaz:
http://arxiv.org/abs/cond-mat/9808311
We present a theoretical study of in-plane magnetization reversal for vicinal ultrathin films using a one-dimensional micromagnetic model with nearest-neighbor exchange, four-fold anisotropy at all sites, and two-fold anisotropy at step edges. A deta
Externí odkaz:
http://arxiv.org/abs/cond-mat/9804009
Autor:
Hyman, R. A., Yang, Kun
Using an asymptotically exact real space renormalization procedure, we find that the Heisenberg antiferromagnetic spin-1 chain undergoes an impurity driven second order phase transition from the Haldane phase to the random singlet phase, as the bond
Externí odkaz:
http://arxiv.org/abs/cond-mat/9608039
Publikováno v:
Phys. Rev. Lett. 76, 839 (1996).
We study the effects of random bonds on spin chains that have an excitation gap in the absence of randomness. The dimerized spin-1/2 chain is our principal example. Using an asymptotically exact real space decimation renormalization group procedure,
Externí odkaz:
http://arxiv.org/abs/cond-mat/9505095
We have performed Monte Carlo simulations to determine current--voltage characteristics of two different vortex glass models in two dimensions. The results confirm the conclusions of earlier studies that there is a transition at $T=0$. In addition we
Externí odkaz:
http://arxiv.org/abs/cond-mat/9409117
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