The electronic band structure in polarized GaInN/GaN heterostructures is studied in photoluminescence excitation spectroscopy. Within multiple quantum well samples optimized for homogeneity, sets of narrow excitation maxima with full width at half maximum values of 10 and 25 meV (T'12 K! are identified and attributed to interband transitions involving excited quantized states of the quantum wel...

We investigate the excitation of a collection of cold atoms to Rydberg states. By a direct numerical solution of Schrödinger’s equation, we are able to compute various interesting properties of the many-body wavefunction. The high polarizability of Rydberg atoms allows them to support large dipole moments which in turn can interact with each other over long ranges. If the interaction energy bet...

Determination and analysis of vibration behavior of structures for at least first few natural frequencies and mode shapes needs several sensors to be connected at different non node points and exciting the structure at one point. Other method for determination of first few mode shapes is to excite several points of the structure at once and sensing the response from one point.  Both methods nee...

Ground and excited state dipoles and polarizabilities of the chromophores N-methyl-6-oxyquinolinium betaine (MQ) and coumarin 153 (C153) in solution have been evaluated using time-dependent density functional theory (TD-DFT). A method for determining the atomic polarizabilities has been developed; the molecular dipole has been decomposed into atomic charge transfer and polarizability terms, and...

The ideal excitation pattern produced by the B1a sub-pulse has uniform intensity and an in-plane phase variation θ(x,y) = –πΔf(x,y) TR. To produce such a pattern it is necessary to use either multiple transmit coils as proposed in [1], a 3D RF pulse as done here, or a combination of the two. In this work a slice-selective tip-down pulse (B1a) with 2D in-plane phase variation was designed using ...

Advances in the design and miniaturization of the lasers and electronics required for Time Correlated Single Photon Counting (TCSPC) measurement of fluorescence lifetime have simplified the use of the time domain method. We have assembled a compact portable system that is capable of measuring lifetimes down to ~200 ps (with deconvolution) and that can operate at a range of excitation and emissi...

Submitted for the MAR07 Meeting of The American Physical Society Doping variation of orbitally-induced anisotropy in electronic structure of the perovskite-type vanadium oxides JUN FUJIOKA, SHIGEKI MIYASAKA, Dept. of Appl. Phys., Univ. of Tokyo, YOSHINORI TOKURA, Dept. of Appl. Phys., Univ. of Tokyo, ERATO-SSS, AIST-CERC — Recently, the perovskite-type vanadium oxide LaVO3 has been attracting m...

Textile electromyography (EMG) electrodes embedded in clothing allow muscle excitation to be recorded in previously inaccessible settings; however, their ability to accurately and reliably measure EMG during dynamic tasks remains largely unexplored. To quantify the validity and reliability of textile electrodes, 16 recreationally active males completed two identical testing sessions, within whi...