Squeezed states are quantum states of a harmonic oscillator in which the variance of two conjugate variables each oscillate out of phase. Ultrafast optical excitation of crystals can create squeezed phonon states, where the variance of the atomic displacements oscillates due to a sudden change in the interatomic bonding strength. With femtosecond x-ray diffraction we measure squeezing oscillati...

Systems of nonlocally coupled oscillators can exhibit complex spatiotemporal patterns, called chimera states, which consist of coexisting domains of spatially coherent (synchronized) and incoherent dynamics. We report on a novel form of these states, found in a widely used model of a limit-cycle oscillator if one goes beyond the limit of weak coupling typical for phase oscillators. Then patches...

We study oscillator chains of the form phi; (k) = omega(k) +K[Gamma( phi(k-1) - phi(k) )+Gamma( phi(k+1) - phi(k) )], where phi(k) epsilon[0,2pi) is the phase of oscillator k. In the thermodynamic limit where the number of oscillators goes to infinity, for suitable choices of Gamma(x), we prove that there is a critical coupling strength K(c), above which a stable frequency-entrained state exist...

We report the detection of 11 Rydberg bands of CO in FUSE spectra of the sight line toward HD203374A. Eight of these electronic bands are seen in the interstellar medium for the first time. Our simultaneous fit of five non-Rydberg A−X bands together with the strongest Rydberg band of CO, C−X (0−0), yields a 4-component cloud structure toward the stellar target. With this model we synthesize the...

Numerous factors interact to affect a participant's ability to encode and recall information. One example of this interaction is known as the category-order effect (COE; Brooks and Watkins, 1990). The present study models earlier work performed by the authors (Schoenherr & Thompson, 2008) with an oscillator-based model of memory (Brown et al., 2000). The OSCillator-based Associative Recall (OSC...

Spatially direct and indirect Stark ladder optical transitions and their electric field induced evolution have been investigated in a GaAs/AlAs (LZ = 6.4 nm/LB = 0.9 nm) superlattice by low temperature photocurrent spectroscopy. When the ground and first excited electron Stark ladder states resonate between the nearest neighbor wells, it is found that oscillator strengths of the direct (n = 0) ...

Level attraction can appear in driven systems where instead of repulsion two modes coalesce a region separated by exceptional points. This behavior was proposed for optomechanical and optomagnonic systems, recently observed dissipative cavity magnon-polaritons. We demonstrate that such regime exists spin-orbit torque system magnetic oscillator is resonantly coupled to an electron reservoir. An ...

The reflectance of highly reduced SrTiO32x has been studied in samples where the carrier concentration—or oxygen-vacancy density — varies from about 10 to 10 cm. Several phonon modes are strongly influenced by oxygen-vacancy density. Oxygen reduction induces a mid-infrared band whose oscillator strength scales with carrier density. In highly reduced samples, a weakly localized plasmon mode deve...