Browsing by Subject "Physics"
Now showing items 1-20 of 550
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1/f noise in the half-metallic oxides CrO2, Fe3O4, and La2/3Sr1/3MnO3
(American Physical Society, 1999)The excess low-frequency (1/f) electrical noise of three representative half-metallic oxides, CrO2, Fe3O4, and La2/3Sr1/3MnO3, has been studied as a function of the temperature (5?300 K) and a magnetic field (up to 12 T). ... -
2D foams above the jamming transition: Deformation matters
(2017)Jammed soft matter systems are often modelled as dense packings of overlapping soft spheres, thus ignoring particle deformation. For 2D (and 3D) soft disks packings, close to the critical packing fraction ϕc, this results ... -
6 x 6 Effective Mass Hamiltonian for Heterostructures grown on (11N)-oriented substrates
(American Physical Society, 2003)The 6?6 effective mass Hamiltonian for semiconductor heterostructures grown on (11N)-oriented substrates is derived and is compared with the 4?4 model. The hole subbands of InGaAs/InP single quantum wells grown on ... -
Ab initio calculation of the biasdependent transport properties of Mn12 molecules
(2009)The bias-dependent transport properties of a device constructed by sandwiching a Mn 12 single molecule magnet between gold electrodes are investigated within an ab initio framework combining the nonequilibrium Green?s ... -
Ab initio electron theory for magnetism in Fe: Pressure dependence of spin-wave energies, exchange parameters, and Curie temperature
(American Physical Society, 2003)The spin-wave spectra for bcc Fe at various lattice constants are calculated by the ab initio density functional electron theory for various lattice constants, and the exchange parameters of a Heisenberg model are determined ... -
Ab initio treatment of noncollinear spin systems within the atomic-sphere approximation and beyond
(American Physical Society, 2000)The properties of noncollinear magnets are often calculated within the framework of density-functional theory in local-spin-density approximation with the additional use of the atomic-sphere approximation for the spin ... -
Absorption and photoluminescence study of CdS quantum dots: the role of host matrix and nanocrystal size and density
(Materials Research Society, 1999) -
Adhesion interaction between atomically defined tip and sample
(American Physical Society, 1998)We have measured forces between an atomically defined W(111) tip and an Au(111) sample in ultrahigh vacuum at 150 K. The W tips are manipulated and characterized on an atomic scale both before and after sample approach by ... -
[Alii] in the ultraviolet spectrum of the symbiotic star RR Telescopii
(Blackwell, 1999)An inspection of a GHRS/HST spectrum of the symbiotic star RR Telescopii reveals the presence of the [Alii] 3s^2 ^1S - 3s3p ^3P_2 line at a vacuum wavelength of 2661.06+/-0.08?, 8.89+/-0.08? away from the Alii] 3s^2 ^1S - ... -
All optical timing extraction with frequency division using a twin section laser diode.
(1993)All-optical timing extraction from a coded line signal with division of the extracted clock frequency is demonstrated using a single twin-section self-pulsating laser diode. Either the bit-rate clock or a submultiple ... -
All optical, high contrast absorptive modulation in an asymmetric Fabry-Perot etalon
(American Institute of Physics, 1991)We report a 27:l switching contrast ratio with 2.5 mW of power in an asymmetric Fabry- Perot Ctalon. The modulation is achieved by optical saturation of the excitonic absorption profile of a 95 A GaAs/AlGaAs multiple ... -
All-optical clock distribution with synchronous frequency division and multiplication
(1992)A master optical clock from a mode locked laser is distributed to two slave twin section lasers. One slave laser divides the optical modulation frequency by 2, the other slave laser multiplies the frequency by 2. It is ... -
All-optical synchronization and frequency division of mode-locked pulses
(1992)We report all-optical synchronization and frequency division of mode-locked input signals, using a selfpulsating laser diode. The performance of mode-locked and sinusoidal input signals are compared. Synchronization ... -
All-optical synchronization of self-pulsating laser diodes
(1996)We examine the behavior of self-pulsating laser diodes when injected with periodic optical signals. We experimentally and theoretically investigate the phase difference between the injected optical signal and the ... -
Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films
(Journal of Applied Physics, 2004)Control of interchain separation enables the optical properties of polymer thin films to be altered. We present a thin film preparation technique that increases the free volume fraction in spin coated polymer thin films ... -
Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films
(2004)Control of interchain separation enables the optical properties of polymer thin films to be altered. We present a thin film preparation technique that increases the free volume fraction in spin coated polymer thin films ... -
Amplified spontaneous emission from a microtube cavity with whispering gallery modes
(2007)We present a detailed study of the photonic modes in microtube cavity of ~ 7-8 ?m outer diameter that can act as micron-scale optical cylindrical resonator. We demonstrate a new route to the fabrication of individual ... -
Amplitude coda of classical waves in disordered media
(2002)The propagation of classical waves in the presence of a disordered medium is studied. We consider wave pulses containing a broad range of frequencies in terms of the configurationally averaged Green function of the system. ... -
Analysis of liquid metal foams through X-ray radioscopy and microgravity experiments
(2014)Complex liquid structures such as metallic foams were produced in a furnace that allowed in situ X-ray monitoring of the evolution of the structure and distribution of the liquid in the foam. The experiments were carried ...