Browsing by Author "RAMIREZ, R"
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- ItemBAND-STRUCTURE OF ONE-DIMENSIONAL RANDOM ALLOYS(1975) ROSSLER, J; RAMIREZ, R
- ItemCORRELATION-EFFECTS IN THE ROTATIONALLY INVARIANT ASYMMETRIC ANDERSON MODEL(1984) MARTINEZ, G; RAMIREZ, R
- ItemDRIVEN PARTICLE IN AN INFINITE SQUARE-WELL - REPRESENTATION AND BREAKDOWN OF THE INVARIANT TORI IN A MULTIPLE-RESONANCE CASE(AMERICAN PHYSICAL SOC, 1995) FUKA, MZ; MCIVER, JK; BECKER, W; ORSZAG, M; RAMIREZ, R
- ItemEXACT SOLUTION OF THE DICKE-MODEL FOR THE INTERACTION OF ONE ATOM WITH THE ELECTROMAGNETIC-FIELD(1981) RAMIREZ, R; ORSZAG, M
- ItemGENERATION OF HIGHLY SQUEEZED STATES IN A 2-PHOTON MICROMASER(1992) ORSZAG, M; RAMIREZ, R; RETAMAL, JC; ROA, LWe consider a lossless two-photon micromaser with atomic polarization. We find that for particular values of the atomic flight time, the field evolves to a pure state which can be made of a superposition of even-photon-number states or odd-number states. These states approach to a perfectly squeezed state as the upper limit of the "trap" increases.
- ItemGENERATION OF PURE STATES IN A 2-PHOTON MICROMASER - EFFECTS OF FINITE DETUNING AND CAVITY LOSSES(1993) ORSZAG, M; ROA, L; RAMIREZ, RIn this paper, we study the generation of pure states in a two-photon micromaser with finite detuning of the intermediate atomic level. This study was done via the temporal evolution of the discrete master equation. We show that it is possible to generate the ideal squeezed vacuum for a broad range of detunings in a lossless cavity and away from the trapping condition. We also-consider the effect of cavity losses.
- ItemHIGH CORRELATION REGIME OF THE HUBBARD-MODEL(1988) LAGOS, M; KIWI, M; RAMIREZ, R
- ItemINTERFACE AMORPHIZATION - A MOLECULAR-DYNAMICS APPROACH(1994) GONCALVES, S; RAMIREZ, R; KIWI, MA two-dimensional molecular dynamics model is introduced order to obtain a better understanding of interface amorphization. We start from a monodisperse system of particles arranged on a perfect two-dimensional triangular lattice, which is divided into two separate regions. In one of these regions the particle size is uniformly reduced, while in the other it is enlarged, preserving the total system 'volume'. Using a whole wealth of diagnostic tools, and visualizations of the particle distributions, a clear distinction between the bulk and the interface disordering transition emerges. Several interesting phenomena, such as the formation of defects, hysteresis of the transition, single-layer displacement and grain boundary development in the vicinity of the interface, show up in our simulations.
- ItemNUMERICAL-ANALYSIS OF DICKE-MODEL FOR ONE ATOM(1982) ROESSLER, J; ORSZAG, M; RAMIREZ, R
- ItemON SIT WITH CHIRPING AND LOSSES(1981) WONG, O; ORSZAG, M; RAMIREZ, R
- ItemON THE THEORY OF TEMPER EMBRITTLEMENT(1986) KIWI, M; MARTINEZ, G; RAMIREZ, R
- ItemQUANTUM FEATURES OF A FREE-ELECTRON LASER(1986) ORSZAG, M; RAMIREZ, R
- ItemSQUEEZING AND BIFURCATION IN THE PHASE PROBABILITY-DISTRIBUTION IN A 2-PHOTON MICROMASER(1991) ORSZAG, M; ROA, L; RAMIREZ, RWe derive a master equation for the two-photon micromaser with atomic coherence. We find that the presence of the atomic coherence modifies the threshold condition in the two-photon micromaser, and also produces squeezing and bifurcation in the phase probability distribution. The maximum squeezing is of 36% and it happens below threshold.