Quantum spin dynamics

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Angle Dependent Magnetoresistance of the Layered Organic Superconductor \kappa-(ET)2Cu(NCS)2: Simulation and Experiment

(2003)

Authors:

PA Goddard, SJ Blundell, J Singleton, RD McDonald, A Ardavan, A Narduzzo, JA Schlueter, AM Kini, T Sasaki
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Intrinsic electronic transport properties of organic field-effect transitors based on single crystalline tetramethyltetraselenafulvalene

Applied Physics Letters AIP Publishing 83:23 (2003) 4782-4784

Authors:

M-S Nam, A Ardavan, RJ Cava, PM Chaikin
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Intrinsic electronic transport properties of organic field-effect transitors based on single crystalline tetramethyltetraselenafulvalene

Applied Physics Letters 83:23 (2003) 4782-4784

Authors:

MS Nam, A Ardavan, RJ Cava, PM Chaikin

Abstract:

The electronic transport properties of organic field-effect transistors (OFET), constructed on the highly anisotropic semiconductor, tetramethyltetraselenafulvalene (TMTSF), were discussed. The results show that transport properties are largely dominated by small polaron formation. An intrinsic hopping mechanism was found to govern the electronic transport in TMTSF OFETs. A maximum mobility of 0.2 cm 2/V s at room temperature was reported.
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A new quantum fluid at high magnetic fields in the marginal charge-density-wave system $\alpha$-(BEDT-TTF)$_2M$Hg(SCN)$_4$ (where $M=$~K and Rb)

(2003)

Authors:

N Harrison, J Singleton, A Bangura, A Ardavan, PA Goddard, RD McDonald, LK Montgomery
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Frequency spectrum of focused broadband pulses of electromagnetic radiation generated by polarization currents with superluminally rotating distribution patterns.

J Opt Soc Am A Opt Image Sci Vis 20:11 (2003) 2137-2155

Authors:

Houshang Ardavan, Arzhang Ardavan, John Singleton

Abstract:

We investigate the spectral features of the emission from a superluminal polarization current whose distribution pattern rotates (with an angular frequency omega) and oscillates (with a frequency omega > omega differing from an integral multiple of omega) at the same time. This type of polarization current is found in recent practical machines designed to investigate superluminal emission. Although all of the processes involved are linear, we find that the broadband emission contains frequencies that are higher than omega by a factor of the order of (omega/omega)2. This generation of frequencies not required for the creation of the source stems from mathematically rigorous consequences of the familiar classical expression for the retarded potential. The results suggest practical applications for superluminal polarization currents as broadband radio-frequency and infrared sources.
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