Self-Organization in Multimode Microwave Phonon Laser (Phaser): Experimental Observation of Spin-Phonon Cooperative Motions

An unusual nonlinear resonance was experimentally observed in a ruby phonon laser (phaser) operating at 9 GHz with an electromagnetic pumping at 23 GHz. The resonance is manifested by very slow cooperative self-detunings in the microwave spectra of stimulated phonon emission when pumping is modulated at a superlow frequency (less than 10 Hz). During the self-detuning cycle new and new narrow phonon modes are sequentially ``fired'' on one side of the spectrum and approximately the same number of modes are ``extinguished'' on the other side, up to a complete generation breakdown in a certain final portion of the frequency axis. This is usually followed by a short-time refractority, after which the generation is fired again in the opposite (starting) portion of the frequency axis. The entire process of such cooperative spectral motions is repeated with high degree of regularity. The self-detuning period strongly depends on difference between the modulation frequency and the resonance frequency. This period is incommensurable with period of modulation. It increases to very large values (more than 100 s) when pointed difference is less than 0.05 Hz. The revealed phenomenon is a kind of global spin-phonon self- organization. All microwave modes of phonon laser oscillate with the same period, but with different, strongly determined phase shifts - as in optical lasers with antiphase motions.Comment: LaTeX2e file (REVTeX4), 5 pages, 5 Postscript figures. Extended and revised version of journal publication. More convenient terminology is used. Many new bibliographic references are added, including main early theoretical and experimental papers on microwave phonon lasers (in English and in Russian

High cooperativity coupling of electron-spin ensembles to superconducting cavities

Electron spins in solids are promising candidates for quantum memories for superconducting qubits because they can have long coherence times, large collective couplings, and many quantum bits can be encoded into the spin-waves of a single ensemble. We demonstrate the coupling of electron spin ensembles to a superconducting transmission-line resonator at coupling strengths greatly exceeding the cavity decay rate and comparable to spin linewidth. We also use the enhanced coupling afforded by the small cross-section of the transmission line to perform broadband spectroscopy of ruby at millikelvin temperatures at low powers. In addition, we observe hyperfine structure in diamond P1 centers and time domain saturation-relaxation of the spins.Comment: 4pgs, 4 figure

To what extent are the characters in the novel “They shoot the horses, don’t they” influenced by the historical and social context?

This paper focuses on Horace McCoy’s masterpiece They Shoot Horses, Don’t They with regard to the influences of social-economic conditions of the Great Depression period on selected characters. McCoy narrates the story of ordinary people who fell down to the bottom of society in the aftermath of Great Depression; and he creates a masterpiece by narrating the ordinary stories of desperation in an extraordinary storyline, which is of a dance marathon. Robert and Gloria are the main characters examined, their inner talks, dialogues with each other and other competents generate the main line of story and, by this way, socialpsychological mindsets of people who suffered from Great Depression are depicted. In addition to Robert and Gloria couple, Kid, Mattie, Jackie and Mario will also be examined regarding their back stories, present conditions which dragged them into such a desperation and their deformed but still alive hopes and expectations. The existential themes given subtextually enrich the plot as well as it enriches the content of this paper. In this sense, desperation, death, sarcasm and hope could be qualified as the keywords of this paper. In this context, McCoy’s novel gives us a chance to be acquainted with the Great Depression period at a multidimensional level; all characters present us a different and distinctive part of what had been happened. Due to these points, this novel is worthy of study and in this paper the influence of that period on the characters is examined

Incoherent "Slow and Fast Light"

We show experimentally that the effects of "slow and fast light" that are considered to be caused by spectral hole-burning under conditions of coherent population oscillations (CPO) can be universally observed with incoherent light fields on objects with the pure-intensity nonlinearity, when such an interpretation is inapplicable. As a light source, we used an incandescent lamp and as objects for study, a photochromic glass and a thermochromic coating. The response of the objects to intensity modulation of the incident light reproduced in all details the commonly accepted experimental evidences of the "light with a negative group velocity" and "ultraslow light". We come to conclusion that so far there are no experimental works providing evidence for real observation of the "CPO-based slow or fast light".Comment: 10 pages and 8 figure

More Juicy 2010 Oregon Pinot Incoming

Rusty Gaffney gives an overview of Oregon\u27s Pinot Noir in this article from his Prince of Pinot blog, volume 9, issue 15. Oregon has made a number of important contributions to the success of Pinot Noir, including strict labeling standards, sustainability, use of vertical trellising, and emphasis on matching variety to climate

Equation of state and phonon frequency calculations of diamond at high pressures

The pressure-volume relationship and the zone-center optical phonon frequency of cubic diamond at pressures up to 600 GPa have been calculated based on Density Functional Theory within the Local Density Approximation and the Generalized Gradient Approximation. Three different approaches, viz. a pseudopotential method applied in the basis of plane waves, an all-electron method relying on Augmented Plane Waves plus Local Orbitals, and an intermediate approach implemented in the basis of Projector Augmented Waves have been used. All these methods and approximations yield consistent results for the pressure derivative of the bulk modulus and the volume dependence of the mode Grueneisen parameter of diamond. The results are at variance with recent precise measurements up to 140 GPa. Possible implications for the experimental pressure determination based on the ruby luminescence method are discussed.Comment: 10 pages, 6 figure