Ultrafast optical rotations of electron spins in quantum dots (2009)
Greilich, A., Economou, Sophia E., Spatzek, S., Yakovlev, D. R., Reuter, D., Wieck, A. D., ...
Coherent manipulation of quantum bits (qubits) on time scales much shorter than the coherence time is a key prerequisite for quantum information processing. Electron spins in quantum dots (QDs) are...
Spin noise of electrons and holes in self-assembled quantum dots (2009)
Crooker, S. A., Brandt, J., Sandfort, C., Greilich, A., Yakovlev, D. R., Reuter, D., ...
We measure the frequency spectra of random spin fluctuations, or "spin noise", in ensembles of (In,Ga)As/GaAs quantum dots (QDs) at low temperatures. We employ a spin noise spectrometer based on a...
Long-lived spin memory in Mn-doped GaAs: Time resolved study (2009)
Akimov, I. A., Dzhioev, R. I., Korenev, V. L., Kusrayev, Yu. G., Zhukov, E. A., Yakovlev, D. R., ...
We study the electron spin dynamics in p-type GaAs doped with magnetic Mn acceptors by means of time-resolved pump-probe and photoluminescence techniques. Measurements in transverse magnetic fields...
Long-term Dynamics of the Electron-nuclear Spin System of a Semiconductor Quantum Dot (2009)
Merkulov, I. A., Alvarez, G., Yakovlev, D. R., Schulthess, T. C.
A quasi-classical theoretical description of polarization and relaxation of nuclear spins in a quantum dot with one resident electron is developed for arbitrary mechanisms of electron spin...
Kaminski, B., Lafrentz, M., Pisarev, R. V., Yakovlev, D. R., Pavlov, V. V., Lukoshkin, V. A., ...
Spectroscopy of the centrosymmetric magnetic semiconductors EuTe and EuSe reveals spin-induced optical second harmonic generation (SHG) in the band gap vicinity at 2.1-2.4eV. The magnetic field and...
Kurtze, H., Yakovlev, D. R., Reuter, D., Wieck, A. D., Bayer, M.
The population dynamics of bright and dark excitons confined in (In,Ga)As/GaAs quantum dots have been studied as function of magnetic field by two-color pump-probe spectroscopy at cryogenic...
Spin currents in diluted magnetic semiconductors (extended version) (2008)
Ganichev, S. D., Tarasenko, S. A., Bel'kov, V. V., Olbrich, P., Eder, W., Yakovlev, D. R., ...
Spin currents resulting in the zero-bias spin separation have been observed in unbiased diluted magnetic semiconductor structures (Cd,Mn)Te/(Cd,Mg)Te. The pure spin current generated due to the...
Collective single mode precession of electron spins in a quantum dot ensemble (2008)
Greilich, A., Spatzek, S., Yugova, I. A., Akimov, I. A., Yakovlev, D. R., Efros, Al. L., ...
We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. This regime is...
Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells (2008)
Astakhov, G. V., Glazov, M. M., Yakovlev, D. R., Zhukov, E. A., Ossau, W., Molenkamp, L. W., ...
Experimental and theoretical studies of all-optical spin pump and probe of resident electrons in CdTe/(Cd,Mg)Te semiconductor quantum wells are reported. A two-color Hanle-MOKE technique (based on...
Auer, T., Oulton, R., Bauschulte, A., Yakovlev, D. R., Bayer, M., Verbin, S. Yu., ...
We present an investigation of the electron-nuclear spin system of negatively doped (In,Ga)As quantum dots (QDs) in millitesla transverse and longitudinal magnetic fields, with the aim of determining...
Temperature induced spin coherence dissipation in quantum dots (2008)
Hernandez, F. G. G., Greilich, A., Brito, F., Wiemann, M., Yakovlev, D. R., Reuter, D., ...
The temperature dependence of electron spin coherence in singly negatively charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday rotation. The decoherence time T2 is constant on a...
Effect of annealing on the hyperfine interaction in InAs/GaAs quantum dots (2007)
Petrov, M. Yu., Ignatiev, I. V., Poltavtsev, S. V., Greilich, A., Bauschulte, A., Yakovlev, D. R., ...
The hyperfine interaction of an electron with nuclei in the annealed self-assembled InAs/GaAs quantum dots is theoretically analyzed. For this purpose, the annealing process, and energy structure of...
Zhukov, E. A., Yakovlev, D. R., Bayer, M., Glazov, M. M., Ivchenko, E. L., Karczewski, G., ...
The mechanisms for generation of long-lived spin coherence in a two-dimensional electron gas (2DEG) have been studied experimentally by means of a picosecond pump-probe Kerr rotation technique....
Berstermann, T., Auer, T., Kurtze, H., Schwab, M., Yakovlev, D. R., Bayer, M., ...
The ground state carrier dynamics in self-assembled (In,Ga)As/GaAs quantum dots has been studied using time-resolved photoluminescence and transmission. By varying the dot design with respect to...
Spin coherence of holes in GaAs/AlGaAs quantum wells (2007)
Syperek, M., Yakovlev, D. R., Greilich, A., Misiewicz, J., Bayer, M., Reuter, D., ...
The carrier spin coherence in a p-doped GaAs/(Al,Ga)As quantum well with a diluted hole gas has been studied by picosecond pump-probe Kerr rotation with an in-plane magnetic field. For resonant...
Robust manipulation of electron spin coherence in an ensemble of singly charged quantum dots (2007)
Greilich, A., Wiemann, M., Hernandez, F. G. G., Yakovlev, D. R., Yugova, I. A., Shabaev, A., ...
Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin coherence time. The...
Acoustic solitons in semiconductor nanostructures (2007)
Akimov, A V, Scherbakov, A V, Dijkhuis, J I, Berstermann, T, Yakovlev, D R, ...
The present lecture gives the review of recent studies where acoustic solitons strongly influence the electron states in a semiconductor nanostructure. The amplitude of soliton pulses is so high that...
Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells (2006)
Yugova, I. A., Greilich, A., Yakovlev, D. R., Kiselev, A. A., Bayer, M., Petrov, V. V., ...
The Zeeman splitting and the underlying value of the g-factor for conduction band electrons in GaAs/Al_xGa_{1-x}As quantum wells have been measured by spin-beat spectroscopy based on a time-resolved...
Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots (2006)
Greilich, A., Oulton, R., Zhukov, E. A., Yugova, I. A., Yakovlev, D. R., Bayer, M., ...
Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from...
Akimov, A. V., Scherbakov, A. V., Yakovlev, D. R., Merkulov, I. A., Bayer, M., Waag, A., ...
The magnetization kinetics in (Zn,Mn)Se/(Zn,Be)Se quantum wells has been studied on a ps-time scale after pulsed laser excitation. The magnetization induced by an external magnetic field is reduced...
Kneip, M. K., Yakovlev, D. R., Bayer, M., Slobodskyy, T., Schmidt, G., Molenkamp, L. W.
We show that the magnetization dynamics in diluted magnetic semiconductors can be controlled separately from the static magnetization by means of an electric field. The spin-lattice relaxation (SLR)...
Tailored quantum dots for entangled photon pair creation (2006)
Greilich, A., Schwab, M., Berstermann, T., Auer, T., Oulton, R., Yakovlev, D. R., ...
We compare the asymmetry-induced exchange splitting delta_1 of the bright-exciton ground-state doublet in self-assembled (In,Ga)As/GaAs quantum dots, determined by Faraday rotation, with its...
Kneip, M. K., Yakovlev, D. R., Bayer, M., Karczewski, G., Wojtowicz, T., Kossut, J.
The technological concept of "digital alloying" offered by molecular-beam epitaxy is demonstrated to be a very effective tool for tailoring static and dynamic magnetic properties of diluted magnetic...
Keller, D., Yakovlev, D. R., Astakhov, G. V., Ossau, W., Crooker, S. A., Slobodskyy, T., ...
The optical properties of two-dimensional electron gases in ZnSe/(Zn,Be)Se and ZnSe/(Zn,Be,Mg)Se modulation-doped quantum wells with electron densities up to 1.4x10^{12} cm^{-2} were studied by...
Kneip, M. K., Yakovlev, D. R., Bayer, M., Maksimov, A. A., Tartakovskii, I. I., Keller, D., ...
The dynamics of spin-lattice relaxation of the Mn-ions in (Zn,Mn)Se-based diluted-magnetic-semiconductor quantum wells is studied by time-resolved photoluminescence. The spin-lattice relaxation time...
Greilich, A., Oulton, R., Verbin, S. Yu., Cherbunin, R. V., Auer, T., Yakovlev, D. R., ...
A key to achieving ultra-long electron spin memory in quantum dots (QDs) at 0~$T$ is the polarization of the nuclei, such that the electron spin is stabilized along the nuclear magnetic field. We...
Astakhov, G. V., Yakovlev, D. R., Rudenkov, V. V., Christianen, P. C. M., Barrick, T., Crooker, S. A., ...
The ground state of negatively charged excitons (trions) in high magnetic fields is shown to be a dark triplet state, confirming long-standing theoretical predictions. Photoluminescence (PL),...
Simple Estimation of X- Trion Binding Energy in Semiconductor Quantum Wells (2005)
Sergeev, R. A., Suris, R. A., Astakhov, G. V., Ossau, W., Yakovlev, D. R.
A simple illustrative wave function with only three variational parameters is suggested to calculate the binding energy of negatively charged excitons (X-) as a function of quantum well width. The...
Electron cyclotron mass in undoped CdTe/CdMnTe quantum wells (2005)
Dremin, A. A., Yakovlev, D. R., Sirenko, A. A., Gubarev, S. I., Shabelsky, O. P., Waag, A., ...
Optically detected cyclotron resonance of two-dimensional electrons has been studied in nominally undoped CdTe/(Cd,Mn)Te quantum wells. The enhancement of carrier quantum confinement results in an...
Fine structure in the excitonic emission of InAs/GaAs quantum dot molecules (2005)
Ortner, G., Yugova, I., Larionov, A., Kurtze, H., Yakovlev, D. R., ...
Spin control in heteromagnetic nanostructures (2004)
Scherbakov, A. V., Akimov, A. V., Yakovlev, D. R., Ossau, W., Hansen, L., Waag, A., ...
The rapidly expanding research in Spintronics, the electronics utilizing the electron spin instead of its charge, is driven by the very interesting potential applications. The actual task is to...
Platonov, A. V., Kochereshko, V. P., Ivchenko, E. L., Yakovlev, D. R., Ivanov, S. V.
Photoluminescence spectra of type-II ZnSe/BeTe superlattices were studied. A linear polarised photoluminescence has been found in the spectral range of spatially indirect exciton transitions. This...
Ivchenko, E. L., Kochereshko, V. P., Plantonov, A. V., Yakovlev, D. R., Keim, M.
We report on a strong enhancement of the Pockels effect in direct-gap type-II ZnSe/BeTe heterostructures. The effect has been found experimentally and analyzed theoretically. In quantum well...
Magnetic Field-Induced Type-I Type-II Transition in (ZuMu)Se/(ZaBe)Se Spin Superlattices (2002)
Koenig, B., Zehnder, U., Yakovlev, D. R., Ossau, W., Gerhard, T.
We have performed a magnetooptical study on spin superlattice structures fabricated on the basis of (ZnMn)Se/(ZnBe)Se. The band alignment of a Zn(0.91)Mn(0.09)Se/ Zn(0.972)Be(0.028)Se superlattice...
Magneto-Reflectivity Studies of ZnSe/ZnMgSSe QWs with Low Density 2DEG (2002)
Astakhov, G. A., Yakovlev, D. R., Kochereshko, V. P., Mikhailov, G. V., Ossau, W.
Magneto-reflectivity has been studied in modulation doped ZnSe/ZnMgSSe quantum well structures with low and moderate carrier concentrations. Negatively charged exciton (trion) lines were observed in...
Charged Excitons in ZnSe-Based QWs (2002)
Yakovlev, D. R., Astakhov, G. V., Kochereshko, V. P., Keller, A., Ossau, W.
We report on magneto-optical studies of ZnSe/(Zn,Mg)(S,Se) and ZnSe/(Zn,Be,Mg)Se quantum wells with n type and p type modulation doping. Negatively and positively charged excitons related to the...
Platonov, A. V., Kochereshko, V. P., Ivchenko, E. L., Yakovlev, D. R., Reuscher, G.
Electroluminescence (EL) spectra are studied in the type-II ZnSe/BeTe light emitting diode (LED) based on a single heterojunctions. The light emitted from the surface exhibits a strong in-plane...
Spectroscopy of Negatively Charged Excitons Interacting With 2DEG in CdTe/(Cd,Mg)Te QWs (2002)
Astakhov, G. V., Kochereshko, V. P., Yakovlev, D. R., Suris, R. A., Ossau, W.
We report on experimental observation of a combined exciton-electron processes in which an incident photon creates a trion (negatively charged exciton-electron complex) and promotes an inter-Landau...
Reflectivity Studies of Trion (X-) and Exciton (X) States in ZnSe/(Zn,Mg)(S,Se) QWs (2002)
Astakhov, G. A., Kochereshko, V. P., Yakovlev, D. R., Suris, R. A., Ossau, W.
The oscillator strength of negatively charged exciton (trion) in ZnSe/(Zn,Mg)(S,Se) quantum-well structures with n-type modulation doping is studied by reflection spectroscopy as a function of...
Gurevich, A. S., Kochereshko, V. P., Platonov, A. V., Yakovlev, D. R., Ossau, W.
Reflectivity and ellipsometry methods were applied to study optical properties of type-II ZnSe/BeTe superlattices. Natural in-plane optical anisotropy of the refractive and absorption indices has...
Binding energy of charged excitons in ZnSe-based quantum wells (2002)
Astakhov, G. V., Yakovlev, D. R., Kochereshko, V. P., Ossau, W., Faschinger, W., Puls, J., ...
Optical Method for Determination of Carrier Density in Modulation Doped Quantum Wells (2001)
Astakhov, G. V., Kochereshko, V. P., Yakovlev, D. R., Ossau, W., Nurnberger, J., Faschinger, W., ...
An optical method is suggested to determine the concentration of two-dimensional electrons in modulation-doped quantum wells at low and moderate electron densities between 10^{9} and 2x10^{11}...
Binding Energy of Charged Excitons in ZnSe-based Quantum Wells (2001)
Astakhov, G. V., Yakovlev, D. R., Kochereshko, V. P., Ossau, W., Puls, J., Henneberger, F., ...
Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies...
Nickel, H. A., Yeo, T., Meining, C. J., Yakovlev, D. R., Furis, M., Dzyubenko, A. B., ...
The nature of the correlated electron gas and its response to photo-injected electron-hole pairs in nominally undoped and modulation-doped multiple quantum-well (MQW) structures was studied by...
Astakhov, G. V., Kosobukin, V. A., Kochereshko, V. P., Yakovlev, D. R., Ossau, W., Landwehr, G., ...
An approach is proposed to determine parameters of homogeneous and inhomogeneous broadening for reflection lines of quasi-two-dimensional excitons in semiconductor quantum well structures. A...
II-VI quantum structures with tunable electron g-factor (2000)
Wojtowicz, T., Kutrowski, M., Karczewski, G., Kossut, J., Konig, B., Keller, A., ...
Effect of spin-glass order on magnetic polarons in semimagnetic semiconductors (1997)
Chudnovskiy, A. L., Oppermann, R., Rosenow, B., Yakovlev, D. R., Zehnder, U., Ossau, W.
A theory accounting for the specific features of magnetic polarons (MP) in the presence of spin glass order is presented. We derive and solve selfconsistent equations for i) the polaron...