scholarly journals Proposal for fast optical control of spin dynamics in a quantum wire

2010 ◽  
Vol 82 (23) ◽  
Author(s):  
Z.-G. Zhu ◽  
C.-L. Jia ◽  
J. Berakdar
Keyword(s):  
Quantum Wire ◽  
Spin Dynamics ◽  
Optical Control

scholarly journals Optical control of the spin of a magnetic atom in a semiconductor quantum dot

Nanophotonics ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 75-89 ◽  
Author(s):  
L. Besombes ◽  
H. Boukari ◽  
C. Le Gall ◽  
A. Brunetti ◽  
C.L. Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fine Structure ◽  
Solid State ◽  
Laser Field ◽  
Coherent Control ◽  
Spin Dynamics ◽  
Optical Control ◽  
Zero Magnetic Field ◽  
Magnetic Atom ◽  
Resonant Laser

Abstract:The control of single spins in solids is a key but challenging step for any spin-based solid-state quantumcomputing device. Thanks to their expected long coherence time, localized spins on magnetic atoms in a semiconductor host could be an interesting media to store quantum information in the solid state. Optical probing and control of the spin of individual or pairs of Manganese (Mn) atoms (S = 5/2) have been obtained in II-VI and IIIV semiconductor quantum dots during the last years. In this paper, we review recently developed optical control experiments of the spin of an individual Mn atoms in II-VI semiconductor self-assembled or strain-free quantum dots (QDs).We first show that the fine structure of the Mn atom and especially a strained induced magnetic anisotropy is the main parameter controlling the spin memory of the magnetic atom at zero magnetic field. We then demonstrate that the energy of any spin state of a Mn atom or pairs of Mn atom can be independently tuned by using the optical Stark effect induced by a resonant laser field. The strong coupling with the resonant laser field modifies the Mn fine structure and consequently its dynamics.We then describe the spin dynamics of a Mn atom under this strong resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that the Mn spin population can be trapped in the state which is resonantly excited. This effect is modeled considering the coherent spin dynamics of the coupled electronic and nuclear spin of the Mn atom optically dressed by a resonant laser field. Finally, we discuss the spin dynamics of a Mn atom in strain-free QDs and show that these structures should permit a fast optical coherent control of an individual Mn spin.

Nonthermal optical control of magnetism and ultrafast laser-induced spin dynamics in solids

2007 ◽  
Vol 19 (4) ◽  
pp. 043201 ◽  
Author(s):  
Alexey V Kimel ◽  
Andrei Kirilyuk ◽  
Fredrik Hansteen ◽  
Roman V Pisarev ◽  
Theo Rasing
Keyword(s):  
Spin Dynamics ◽  
Ultrafast Laser ◽  
Optical Control

Optical control of electron spin dynamics in self-assembled (In,Ga)As/GaAs quantum dots

2006 ◽  
Vol 243 (14) ◽  
pp. 3719-3724 ◽  
Author(s):  
A. Greilich ◽  
R. Oulton ◽  
E. A. Zhukov ◽  
I. A. Yugova ◽  
D. R. Yakovlev ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Spin Dynamics ◽  
Optical Control ◽  
Self Assembled ◽  
Electron Spin Dynamics

Ultrafast optical control of orbital and spin dynamics in a solid-state defect

Science ◽  
2014 ◽  
Vol 345 (6202) ◽  
pp. 1333-1337 ◽  
Author(s):  
L. C. Bassett ◽  
F. J. Heremans ◽  
D. J. Christle ◽  
C. G. Yale ◽  
G. Burkard ◽  
...  
Keyword(s):  
Solid State ◽  
Spin Dynamics ◽  
Optical Control ◽  
Ultrafast Optical

Strain measurement in In0.2Ga0.8As/GaAs quantum wires by convergent beam electron diffraction

1995 ◽  
Vol 53 ◽  
pp. 444-445
Author(s):  
S. Hillyard ◽  
Y.-P. Chen ◽  
J.D. Reed ◽  
W.J. Schaff ◽  
L.F. Eastman ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Semiconductor Lasers ◽  
Quantum Wire ◽  
Quantum Wires ◽  
Convergent Beam Electron Diffraction ◽  
Zero Order ◽  
Beam Electron ◽  
Local Lattice ◽  
Device Applications ◽  
Convergent Beam

The positions of high-order Laue zone (HOLZ) lines in the zero order disc of convergent beam electron diffraction (CBED) patterns are extremely sensitive to local lattice parameters. With proper care, these can be measured to a level of one part in 104 in nanometer sized areas. Recent upgrades to the Cornell UHV STEM have made energy filtered CBED possible with a slow scan CCD, and this technique has been applied to the measurement of strain in In0.2Ga0.8 As wires.Semiconductor quantum wire structures have attracted much interest for potential device applications. For example, semiconductor lasers with quantum wires should exhibit an improvement in performance over quantum well counterparts. Strained quantum wires are expected to have even better performance. However, not much is known about the true behavior of strain in actual structures, a parameter critical to their performance.

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