scholarly journals Spin-polarized current generation from quantum dots without magnetic fields

2008 ◽  
Vol 78 (3) ◽  
Author(s):  
Jacob J. Krich ◽  
Bertrand I. Halperin
Keyword(s):  
Quantum Dots ◽  
Magnetic Fields ◽  
Current Generation ◽  
Spin Polarized

EXCITON SPIN STATES IN NANOCRYSTAL QUANTUM DOTS REVEALED BY SPIN-POLARIZED RESONANT PHOTOLUMINESCENCE AND RAMAN SPECTROSCOPY

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3769-3774 ◽  
Author(s):  
MADALINA FURIS ◽  
TODD BARRICK ◽  
PATRICK ROBBINS ◽  
SCOTT A. CROOKER ◽  
MELISSA PETRUSKA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Magnetic Fields ◽  
High Field ◽  
Polarized Light ◽  
Zero Magnetic Field ◽  
Spin States ◽  
Circularly Polarized Light ◽  
Spin Polarized ◽  
Nanocrystal Quantum Dots

We performed spin-polarized resonant Raman and resonant photoluminescence excitation spectroscopy (also known as "fluorescence line narrowing") on ZnS -capped CdSe nanocrystal quantum dots in high magnetic fields to 33 Tesla and temperatures down to 1.7K, which allows detailed investigation of the excitonic spin states. In these experiments, spin-polarized electrons and holes are resonantly injected by circularly polarized light into colloidal quantum dots of specific size, using a narrowband tunable dye laser and a fiber-coupled probe that is specially-designed for use in high-field magnets. In addition to the expected broad features associated with excitonic recombination and Raman-like peaks associated with quantized acoustic phonons, the photoluminescence spectra measured at magnetic fields larger than 10 Tesla develop a sharp peak, which moves roughly linearly with applied magnetic field. Further, the energy of this high-field peak varies systematically as a function of nanocrystal size. However, unlike typical electron spin flip transitions, the mode energy extrapolates to a finite value at zero magnetic field, suggesting the existence of an additional size-dependent exchange mechanism.

Correlation effects in quantum dots in magnetic fields

1995 ◽  
Vol 212 (3) ◽  
pp. 224-230 ◽  
Author(s):  
L. Martín-Moreno ◽  
J.J. Palacios ◽  
J.H. Oaknin ◽  
C. Tejedor
Keyword(s):  
Quantum Dots ◽  
Magnetic Fields ◽  
Correlation Effects
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