scholarly journals Optical emission of GaN/AlN quantum-wires – the role of charge transfer from a nanowire template

Nanoscale ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 5591-5598 ◽  
Author(s):  
Jan Müßener ◽  
Ludwig A. Th. Greif ◽  
Stefan Kalinowski ◽  
Gordon Callsen ◽  
Pascal Hille ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Wires ◽  
Optical Emission ◽  
One Dimensional ◽  
Carrier Transfer

One-dimensional GaN quantum-wires grown on nanowire templates exhibit bright and sharp luminescence due to carrier transfer from the nanowire cores.

scholarly journals Internal shocks from variable outflows in classical novae

2019 ◽  
Vol 491 (3) ◽  
pp. 4232-4246 ◽  
Author(s):  
Elad Steinberg ◽  
Brian D Metzger
Keyword(s):  
Gamma Ray ◽  
Optical Emission ◽  
Spectral Lines ◽  
One Dimensional ◽  
Classical Novae ◽  
Internal Shock ◽  
Forward Shock ◽  
The Common ◽  
Hydrodynamical Simulations

ABSTRACT We present one-dimensional hydrodynamical simulations including radiative losses, of internal shocks in the outflows from classical novae, to explore the role of shocks in powering multiwavelength emission from radio to gamma-ray wavelengths. Observations support a picture in which the initial phases of some novae generate a slow, equatorially focused outflow (directly from the outer Lagrange point, or from a circumbinary disc), which then transitions to, or is overtaken by, a faster more isotropic outflow from the white dwarf which collides and shocks the slower flow, powering gamma-ray and optical emission through reprocessing by the ejecta. However, the common occurrence of multiple peaks in nova light curves suggests that the outflow’s acceleration need not be monotonic, but instead can involve successive transitions between ‘fast’ and ‘slow’ modes. Such a time-fluctuating outflow velocity naturally can reproduce several observed properties of nova, such as correlated gamma-ray and optical flares, expansion of the photosphere coincident with (though lagging slightly) the peak flare luminosity, and complex time evolution of spectral lines (including accelerating, decelerating, and merging velocity components). While the shocks are still deeply embedded during the gamma-ray emission, the onset of ∼keV X-ray and ∼10 GHz radio synchrotron emission is typically delayed until the forward shock of the outermost monolithic shell (created by merger of multiple internal shock-generated shells) reaches a sufficiently low column through the dense external medium generated by the earliest phase of the outburst.

Optical emission of a one-dimensional electron gas in semiconductor V-shaped quantum wires

1998 ◽  
Vol 58 (16) ◽  
pp. 10705-10708
Author(s):  
H. P. van der Meulen ◽  
J. Rubio ◽  
I. Azcona ◽  
J. M. Calleja ◽  
T. C. Rojas ◽  
...  
Keyword(s):  
Quantum Wires ◽  
Electron Gas ◽  
Optical Emission ◽  
Dimensional Electron ◽  
One Dimensional ◽  
Dimensional Electron Gas

Dynamic adjustment of emission from both singlets and triplets: the role of excited state conformation relaxation and charge transfer in phenothiazine derivates

2021 ◽  
Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Dynamic Adjustment ◽  
Twisted Intramolecular Charge Transfer

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.

Adiabatic large polarons in anisotropic molecular crystals

2011 ◽  
Vol 35 (1) ◽  
pp. 15-27
Author(s):  
Zoran Ivić ◽  
Željko Pržulj
Keyword(s):  
Energy Transfer ◽  
Effective Mass ◽  
Molecular Crystals ◽  
Single Chain ◽  
Proper Understanding ◽  
One Dimensional ◽  
Interchain Coupling ◽  
Large Polaron ◽  
The One

Adiabatic large polarons in anisotropic molecular crystals We study the large polaron whose motion is confined to a single chain in a system composed of the collection of parallel molecular chains embedded in threedimensional lattice. It is found that the interchain coupling has a significant impact on the large polaron characteristics. In particular, its radius is quite larger while its effective mass is considerably lighter than that estimated within the one-dimensional models. We believe that our findings should be taken into account for the proper understanding of the possible role of large polarons in the charge and energy transfer in quasi-one-dimensional substances.

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