scholarly journals Quantum-mechanical spin states and Zeeman-level diagrams of the positively charged exciton

2003 ◽  
Vol 68 (3) ◽  
Author(s):  
M. Hayne ◽  
T. Vanhoucke ◽  
V. V. Moshchalkov
Keyword(s):  
Quantum Mechanical ◽  
Spin States ◽  
Charged Exciton ◽  
Zeeman Level ◽  
Positively Charged

Polarization Spectroscopy of Charged Single Self-Assembled Quantum Dots

2003 ◽  
Vol 789 ◽  
Author(s):  
Morgan E. Ware ◽  
Allan Bracker ◽  
Daniel Gammon ◽  
David Gershoni
Keyword(s):  
Quantum Dots ◽  
Circular Polarization ◽  
Schottky Diode ◽  
Heavy Hole ◽  
Photoluminescence Spectra ◽  
Polarization Spectroscopy ◽  
Charged Exciton ◽  
Self Assembled ◽  
Positively Charged

ABSTRACTWe have demonstrated single dot spectroscopy of InAs/GaAs self-assembled quantum dots embedded in a bias controlled Schottky diode. The photoluminescence spectra exhibit discrete lines depending on bias, which we attribute to the recombination of positively charged, neutral, and negatively charged confined excitons. With excitation directly into the dot, large circular polarization memory is exhibited by the two charged exciton (trion) lines. This indicates long spin lifetimes for both the electron and the heavy hole in the quantum dots.

N2 positively charged defects in diamond. A quantum mechanical investigation of the structural, electronic, EPR and vibrational properties

2020 ◽  
Vol 8 (15) ◽  
pp. 5239-5247 ◽  
Author(s):  
Giulio Di Palma ◽  
Francesco Silvio Gentile ◽  
Valentina Lacivita ◽  
William C. Mackrodt ◽  
Mauro Causà ◽  
...  
Keyword(s):  
Ab Initio ◽  
Quantum Mechanical ◽  
Vibrational Properties ◽  
Quantum Mechanical Calculations ◽  
Mechanical Investigation ◽  
Crystal Code ◽  
Charged Defects ◽  
Positively Charged ◽  
Vibrational Characterization

Structural, EPR and vibrational characterization of the N2, N+2 and N++2 defects in diamond from ab initio quantum-mechanical calculations with the CRYSTAL code.

POLARIZED PHOTOLUMINESCENCE OF EXCITONS IN n-, p- AND UNDOPED InAs/GaAs QUANTUM DOTS

2007 ◽  
Vol 06 (05) ◽  
pp. 319-322
Author(s):  
J. FÜRST ◽  
H. PASCHER ◽  
V. A. SHALYGIN ◽  
L. E. VOROBJEV ◽  
D. A. FIRSOV ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Continuous Wave ◽  
Polarized Light ◽  
Exciting Light ◽  
Circularly Polarized Light ◽  
Doped Quantum Dots ◽  
Charged Exciton ◽  
Different Shapes ◽  
Light Depolarization ◽  
Positively Charged

Polarized photoluminescence from InAs / GaAs self-assembled quantum dots has been investigated under continuous wave excitation by circularly polarized light. Depolarization of the photoluminescence in a magnetic field perpendicular to the wavevector of the exciting light (Hanle effect) was studied. For n-doped, undoped and p-doped quantum dots the observed Hanle curves exhibit qualitatively different shapes: single-, bi-, and tri-Lorentzian, respectively. In the two latter cases the complicated shape of the Hanle curve is attributed to the different processes of radiative recombination which take place simultaneously. Recombination of uncharged excitons and recombination of positively charged exciton complexes are considered. Corresponding spin lifetimes are determined.

A Quantum Mechanical Investigation of Positively Charged Defects In SiO2 Thin Film Devices

1996 ◽  
Vol 446 ◽  
Author(s):  
Antonio M. Ferreira ◽  
Shashi P. Kama ◽  
Charles P. Brothers ◽  
Robert D. Pugh ◽  
Babu B. K. Singaraju ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Mechanical ◽  
Hartree Fock ◽  
Sio2 Thin Film ◽  
Mechanical Investigation ◽  
Moller Plesset ◽  
The Stability ◽  
Charged Defects ◽  
Positively Charged ◽  
Thin Film Devices

AbstractAb initio Hartree-Fock and second-order Möller-Plesset theory calculations have been performed to investigate the stability of triply-coordinated 0+ centers in the Si-O-Si network of amorphous SiO2. The calculations reveal that the H+ ion binds with a bridging O center to form a very stable (De > 6 eV) trivalent O complex. Capture of an electron by the positively charged protonated complex, however, is predicted to immediately lead to the dissociation of the O-H bond. A relatively weaker, but stable bond is also formed between the bridging O atom and a +SiH3 ion.

Decay dynamics of the positively charged exciton in a single charge tunable self-assembled quantum dot

2006 ◽  
Vol 89 (4) ◽  
pp. 043107 ◽  
Author(s):  
P. A. Dalgarno ◽  
J. McFarlane ◽  
B. D. Gerardot ◽  
R. J. Warburton ◽  
K. Karrai ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Single Charge ◽  
Charged Exciton ◽  
Self Assembled ◽  
Positively Charged

Deposition of Functionalised Gold Nanoparticles by the Layer-by-Layer Electrostatic Technique

2003 ◽  
Vol 789 ◽  
Author(s):  
S. Paul ◽  
M. Palumbo ◽  
M. C. Petty ◽  
N. Cant ◽  
S. D. Evans
Keyword(s):  
Gold Nanoparticles ◽  
Silicon Substrate ◽  
Coulomb Blockade ◽  
Quantum Mechanical ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Solid Substrates ◽  
Oppositely Charged ◽  
Positively Charged

ABSTRACTIntensive research is currently underway to exploit the intriguing optical and electronic behaviour of nano-sized particles. The basis of the unique properties of these particles is the smallness of their size; dimensions on the nanometre scale can result in interesting quantum mechanical phenomena, such as Coulomb blockade. There are currently a number of ways by which the nanoparticles can be deposited onto solid substrates. Here, we report on the use of the layer-by-layer electrostatic method, which has shown much promise in the context of deposition of thin films of certain organic materials. In this technique, layers of oppositely charged materials are generated by dipping an appropriate substrate into solutions of polyelectrolytes. For example, the polybases poly(ethyleneimine) (PEI), when adsorbed on a substrate, produce a positively charged surface. We have deposited carboxylic acid (-COOH) derivatised gold nanoparticles onto a PEI-coated silicon substrate and an amine funtionalised silicon substrate. The distribution of the gold nanoparticles was compared using atomic force microscopy.

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