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131.
132.
We establish that correlation functions of classical lattice spin models can be represented by series expansions in terms
of self-avoiding random walks. Using this, we get new upper bounds of critical temperatures of the O(N) symmetric classical Heisenberg models.
Received: 21 March 1996 / Accepted: 26 July 1996 相似文献
133.
134.
Miki Yumoto Takahiro Tamura Taketomo Sato Hideki Hasegawa 《Superlattices and Microstructures》2003,34(3-6):485
In view of applications to hexagonal binary decision diagram (BDD) LSIs, a first attempt is made to form quantum BDD node switches on selectively grown (SG) embedded quantum wires (QWRs) by molecular beam epitaxy (MBE). SG branch switches controlled by a Schottky wrap gate (WPG) were successfully fabricated by MBE growth and subsequent device processing. Gate control characteristics were studied by gate-dependent Shubnikov–de-Haas measurements, and the behavior was found to be similar to that of devices fabricated on wires by etching. The switch exhibited clear conductance quantization at low temperature, and temperature dependence of the voltage slope of conductance jump was clarified. A Y-branch BDD node device using two SG branch switches was successfully fabricated, and realized clear path switching characteristics. 相似文献
135.
Ultrashort-pulse fiber ring lasers 总被引:4,自引:0,他引:4
L.E. Nelson D.J. Jones K. Tamura H.A. Haus E.P. Ippen 《Applied physics. B, Lasers and optics》1997,65(2):277-294
Received: 18 February 1997/Revised version: 22 April 1997 相似文献
136.
Hideo Tamura 《Annales Henri Poincare》2007,8(6):1071-1114
The fact that vector potentials have a direct significance to quantum particles moving in magnetic fields is known as the
Aharonov–Bohm effect (A–B effect). We study this quantum effect through the semiclassical analysis on total cross sections
in the magnetic scattering by two solenoidal (point-like) fields with total flux vanishing in two dimensions. We derive the
asymptotic formula with first three terms. The system with two parallel fields seems to be important in practical aspects
as well as in theoretical aspects, because it may be thought of a toroidal solenoid with zero cross section in three dimensions
under the idealization that the two fields connect at infinity in their direction. The corresponding classical mechanical
system has the trajectory oscillating between two centers of fields. The special emphasis is placed on analyzing how the trapping
effect from classical mechanics is related to the A–B quantum effect in the semiclassical asymptotic formula.
Submitted: September 3, 2006. Accepted: January 10, 2007. 相似文献
137.
This paper deals with a probabilistic formulation of the wave scattering from a periodic random surface. When a plane wave is incident on a random surface described by a periodic stationary stochastic process, it is shown by a group-theoretic consideration that the scattered wave may have a stochastic Floquet form, i.e. a product of a periodic stationary random function and an exponential phase factor. Such a periodic stationary random function is then written by a harmonic series representation similar to a Fourier series, where Fourier coefficients are mutually correlated stationary processes instead of constants. The mutually correlated stationary processes are represented by Wiener - Hermite functional series with unknown coefficient functions called Wiener kernels. In case of a slightly rough surface and TE wave incidence, low-order Wiener kernels are determined from the boundary condition. Several statistical properties of the scattering are calculated and illustrated in figures. 相似文献
138.
We study the possibility of testing local realistic theory (LRT) based on the Bell inequality for the correlations in the decay modes of entangled K or B-mesons. It is shown that such a test is possible for a restricted class of LRT, despite the passive nature of decay events and/or the non-unitary treatment of the correlations which invalidate the test for general LRT. Unfortunately, the present setup of the KEKB (Belle) experiment, where the coherence of entangled B-mesons has been confirmed recently, does not admit such a test due to the indeterminacy in the separate decay times of the entangled pairs. 相似文献
139.
140.