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5 papers · 2 filters
High quality mechanical and optical properties of commercial silicon nitride membranes
B. M. Zwickl, W. E. Shanks, A. M. Jayich +4
We have measured the optical and mechanical loss of commercial silicon nitride membranes. We find that 50 nm-thick, 1 mm^2 membranes have mechanical Q > 10^6 at 293 K, and Q > 10^7…
Strong dispersive coupling of a high finesse cavity to a micromechanical membrane
J. D. Thompson, B. M. Zwickl, A. M. Jayich +3
Macroscopic mechanical objects and electromagnetic degrees of freedom couple to each other via radiation pressure. Optomechanical systems with sufficiently strong coupling are pred…
Excited state quantum phase transitions in many-body systems
M. A. Caprio, P. Cejnar, F. Iachello
Phenomena analogous to ground state quantum phase transitions have recently been noted to occur among states throughout the excitation spectra of certain many-body models. These ex…
Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses
Dale Li, A. E. Dementyev, Yanqun Dong +2
NMR spin echo measurements of C-13 in C60, Y-89 in Y2O3, and Si-29 in silicon are shown to defy conventional expectations when more that one pi pulse is used. Multiple pi-pulse ech…
Lie fields revisited
Peter Morgan
A class of interacting classical random fields is constructed using deformed *-algebras of creation and annihilation operators. The fields constructed are classical random field ve…