Optical tailoring of electron spin coherence in quantum dots |
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| Authors: | Alex Greilich Dmitri R Yakovlev Manfred Bayer |
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| Institution: | 1. Departamento de Física, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile;2. Departamento de Física, Universidad Técnica Federico Santa María, Vicuña Mackenna 3939, Santiago, Chile;1. Servicio de Apoyo a la Investigación Tecnológica, Universidad Politécnica de Cartagena, 30202 Cartagena, Murcia, Spain;2. UCAM Universidad Católica San Antonio, Departamento de Ciencias Politécnicas, Campus de los Jerónimos, s/n, Guadalupe 30107, Murcia, Spain;3. Departamento de Ingeniería Minera, Geológica y Cartográfica, Universidad Politécnica de Cartagena, 30203 Cartagena, Murcia, Spain;4. Departamento de Geología, Universidad Autónoma de Barcelona, 08193, Bellaterra, Cerdanyola del Vallès, Barcelona, Spain;5. Instituto Geológico y Minero de España, Ríos Rosas, 23, 28003 Madrid, Spain;1. Laser Physics Department, Science College for Women, Babylon University, Hilla, Iraq;2. Physics Department, Science College, Al-Mustansiriyah University, Baghdad, Iraq;3. Nassiriya Nanotechnology Research Laboratory (NNRL), Science College, Thi-Qar University, Nassiriya, Iraq |
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| Abstract: | We address the precession of an ensemble of electron spins, each confined in a (In, Ga)As/GaAs self-assembled quantum dot. The quantum dot inhomogeneity is directly reflected in the precession of the optically oriented electron spins about an external magnetic field, which is subject to fast dephasing on a nanoseconds time scale. Proper periodic laser excitation allows synchronization of the electron spin precessions with the excitation cycle. The experimental conditions can be tailored such that eventually all (about a million) electron spins that are excited by the laser precess with a single frequency. In this regime the ensemble can be exploited during the single electron spin coherence times being in the microseconds range. |
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