Access to long-term optical memories using photon echoes retrieved from semiconductor spins

Langer, L.; Poltavtsev, S. V.; Yugova, I. A.; Salewski, M.; Yakovlev, D. R.; Karczewski, G.; Wójtowicz, T.; Акимов, И. А.; Bayer, М.

doi:10.1038/nphoton.2014.219

Cited by 81 publications

(43 citation statements)

References 35 publications

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“…Theoretical analysis of the obtained dependencies for excitons (1)(2)(3)(4)(5) and of the similar theoretical dependencies for trions (6-10) described in Ref. [1] allows us to propose the polarization protocols of optical excitation to separate experimentally the contributions of the exciton and the trion PE signals. For example, in HHH configuration, the exciton signal has an oscillating character, while the trion signal has a decaying character without any oscillations.…”

Section: Resultsmentioning

confidence: 72%

“…Recently it has been found that using the photon echo (PE) technique, one can transfer an information contained in the optical field into a spin system where it is decoupled from the optical field and may persist for a long time [1].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical results complemented by the results for trions from Ref. [1] are compared with the experimental data. …”

Section: Introductionmentioning

confidence: 99%

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Studies of photon echo from exciton ensemble in (In,Ga)As quantum dots

Babenko¹,

Yugova²,

Poltavtsev

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. Photon echo from trions and excitons in (In,Ga)As/GaAs quantum dots has been studied theoretically and experimentally. Theoretical analysis allowed us to distinguish photon echo signals from excitons and trions measured in the same range of wavelength using different polarization configurations of laser excitation. The theoretical predictions are in good agreement with the experimental data. IntroductionPhoton echo from trions and excitons in (In,Ga)As/GaAs quantum dots has been studied theoretically and experimentally. Theoretical analysis allowed us to distinguish photon echo signals from excitons and trions measured in the same range of wavelength using different polarization configurations of laser excitation. The theoretical predictions are in good agreement with the experimental data.The interaction between material excitations (excitons and trions) in semiconductor nanostructures and light can be very effective due to high oscillator strength of the excitations. Recently it has been found that using the photon echo (PE) technique, one can transfer an information contained in the optical field into a spin system where it is decoupled from the optical field and may persist for a long time [1].Semiconductor quantum dots (QDs) are considered to be promising for storing an information about the optical excitation since spin relaxation of electrons and holes in these nanostructures is characterized by significantly long times [2]. The inhomogeneity of the QD ensemble and spectral overlap of the exciton and trion transitions hamper investigations and analysis of these structures. In the present work we describe the theoretical model developed for the photon echo signal from exciton ensemble in (In,Ga)As/GaAs QDs. Theoretical results complemented by the results for trions from Ref.[1] are compared with the experimental data.

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Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Studies of photon echo from exciton ensemble in (In,Ga)As quantum dots

Babenko¹,

Yugova²,

Poltavtsev

et al. 2018

J. Phys.: Conf. Ser.

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“…Akimov and his coauthors [2,3] is the following (apart from the fact that the colleagues observed a nanosecond PE at helium temperature, and not a femtosecond PE, like us, and at room temperature). In their works, the Larmor precession under the action of a transverse magnetic field was used to switch over the back of the object on which the PE was formed.…”

Section: Introductionmentioning

confidence: 71%

Magneto-optical properties of the photon echo: status of research and prospects of application

et al. 2017

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Abstract. The results of the study of the polarization properties of the stimulated photon echo (SPE) excited at room temperature on free excitons and exciton states localized on surface defects of textured thin films are reported. The results of observation and investigation of the effect of the non-Faraday rotation of a femtosecond SPE in a textured thin film are presented. The physical processes occurring under the Faraday effect and the effect of the non-Faraday rotation of the photon echo (PE) polarization plane are compared.When the PE is formed in the presence of a longitudinal homogeneous magnetic field, the effect of the non-Faraday rotation of the PE polarization plane takes place. This effect differs fundamentally from the Faraday effect in the physics of the occurring processes and the magnitude of the rotation angle, which is three times bigger in exponent part than the Faraday rotation at the same values of the intensity of the longitudinally applied uniform magnetic field. The angle of the non-Faraday rotation of the PE polarization plane depends on the g factor of the quantum transition of the resonant medium, on the magnitude of the applied magnetic field H and on the time intervals separating the exciting pulses. The PE is formed during the optical transient process when the exciting laser radiation is applied to a resonant medium. The difference between these effects is as follows.When the quantum system is excited by pulses with a duration much shorter than the relaxation times of the resonant medium equally polarized pseudoelectric dipoles are produced on all particles. The process of dephasing (phasing) of these dipoles occurs at different phase velocities for the upper (dextrorotatory) and lower (left-handed) components of the hyperfine structure of the excited level, which is split due to the Zeeman effect. The upper component increases, while the lower component decreases the phase velocity of the precession of the dipole. The resulting phase velocity difference, which leads to the rotation of the polarization plane of the echo signal, increases with increasing magnetic field strength and the time of dephasing (phasing) of the dipoles, given by the value of the time intervals * Corresponding author: Popov@volgatech.net

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“…We note that the metal layer at the top of the TP microcavity can be used to control the charge state of QDs electrically [13]. Therefore, such structures are appealing for investigations of long-lived photon echoes from charged QDs where the decay rate is governed by the spin relaxation of the resident electrons [34].…”

Section: −1mentioning

confidence: 99%