Superconductivity in a narrow-band system with intersite electron pairing in two dimensions. II. Effects of nearest-neighbor exchange and correlated hopping

1989 ◽  
Vol 39 (16) ◽  
pp. 11653-11662 ◽  
Author(s):  
R. Micnas ◽  
J. Ranninger ◽  
S. Robaszkiewicz
Keyword(s):  
Nearest Neighbor ◽  
Narrow Band ◽  
Band System ◽  
Two Dimensions ◽  
Electron Pairing

Superconductivity in a narrow-band system with intersite electron pairing in two dimensions: A mean-field study

1988 ◽  
Vol 37 (16) ◽  
pp. 9410-9422 ◽  
Author(s):  
R. Micnas ◽  
J. Ranninger ◽  
S. Robaszkiewicz ◽  
S. Tabor
Keyword(s):  
Field Study ◽  
Narrow Band ◽  
Band System ◽  
Mean Field ◽  
Two Dimensions ◽  
Electron Pairing

THE EXACT SOLUTION OF SOME LATTICE STATISTICS MODELS WITH FOUR STATES PER SITE

1964 ◽  
Vol 42 (8) ◽  
pp. 1564-1572 ◽  
Author(s):  
D. D. Betts
Keyword(s):  
Partition Function ◽  
Nearest Neighbor ◽  
Quaternary Alloy ◽  
Interesting Property ◽  
Two Dimensions ◽  
Lattice Statistics ◽  
Critical Temperatures ◽  
Different Types ◽  
Interacting Systems ◽  
Statistical Mechanical

Statistical mechanical ensembles of interacting systems localized at the sites of a regular lattice and each having four possible states are considered. A set of lattice functions is introduced which permits a considerable simplification of the partition function for general nearest-neighbor interactions. The particular case of the Potts four-state ferromagnet model is solved exactly in two dimensions. The order–disorder problem for a certain quaternary alloy model is also solved exactly on a square net. The quaternary alloy model has the interesting property that it has two critical temperatures and exhibits two different types of long-range order. The partition function for the spin-3/2 Ising model on a square net is expressed in terms of graphs without odd vertices, but has not been solved exactly.

scholarly journals VLA-Phoenix Observations of a Narrow-Band Decimetric Burst

1990 ◽  
Vol 142 ◽  
pp. 525-526
Author(s):  
Robert F. Willson ◽  
Arnold O. Benz
Keyword(s):  
Spectral Properties ◽  
Narrow Band ◽  
Two Dimensions ◽  
High Time Resolution ◽  
Large Array ◽  
Digital Radio ◽  
Very Large Array ◽  
Circularly Polarized ◽  
The Phoenix ◽  
Positive Frequency

We discuss observations of a highly-circularly polarized multiply-impulsive microwave burst detected by the Very Large Array and the Phoenix Digital Radio Spectrometer. The VLA was used to resolve the burst in two dimensions, while PHOENIX provided high time resolution information about its spectral properties. During part of the burst, positive frequency drifts were detected, suggesting inwardly propagating beams of electrons emitting Type III-like radiation.

MONTE CARLO STUDIES OF A NEW MODEL DRIVEN DIFFUSIVE SYSTEM WITH REPULSIVE INTERACTIONS

1992 ◽  
Vol 06 (26) ◽  
pp. 1673-1679
Author(s):  
K.K. MON
Keyword(s):  
Monte Carlo ◽  
Lattice Gas ◽  
Nearest Neighbor ◽  
Two Dimensions ◽  
Model Driven ◽  
New Class ◽  
Driven Lattice Gas ◽  
Driven Diffusive System ◽  
Monte Carlo Studies ◽  
Repulsive Interactions

We propose a new class of driven lattice gas with repulsive nearest-neighbor interactions. Particles are allowed to jump to empty next-nearest-neighbor (nnn) sites in addition to the standard nearest-neighbor moves. In contrast to previous model with repulsive interactions, the external driving field (E) acts only along the nnn directions and does not destroy ground state sublattice ordering. Extensive Monte Carlo simulations in two dimensions for small E are consistent with a line of continuous transitions with Ising exponents. First-order transitions are also found for larger E.

Heterodyne Digital Control of a High-Frequency Micromechanical Oscillator

2005 ◽  
Vol 128 (3) ◽  
pp. 577-583 ◽  
Author(s):  
Thomas E. Kriewall ◽  
Joseph L. Garbini ◽  
John A. Sidles ◽  
Jonathan P. Jacky
Keyword(s):  
High Frequency ◽  
Digital Control ◽  
Narrow Band ◽  
Band System ◽  
Digital Signal ◽  
Computational Effort ◽  
Pass Band ◽  
Magnetic Resonance Force Microscopy ◽  
Force Microscopy ◽  
Lock In

In this paper we present heterodyne control as a technique for digital feedback control of a high-frequency, narrowband micromechanical oscillator. In this technique, isolated and synchronized hardware downconversion and upconversion components are used in conjunction with digital signal processing (DSP) to control the oscillator. Heterodyne control offers reduced computational effort for the digital control of high-frequency, narrow band system, the reduction of noise outside the pass-band, and the generation of lock-in amplifier signals. We present heterodyne control with design criteria in the context of magnetic resonance force microscopy (MRFM) cantilever control. Finally, we present experimental results of heterodyne control applied to an emulated radio-frequency microcantilever system.

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