Article
Engineering, Electrical & Electronic
Nikita Yu Gordeev, Mikhail Maximov, Alexey S. Payusov, Artem A. Serin, Yuri M. Shernyakov, Sergey A. Mintairov, Nikolay A. Kalyuzhnyy, Alexey M. Nadtochiy, Alexey E. Zhukov
Summary: The study investigates the material gain properties of mixed-dimensional quantum heterostructures known as quantum well-dots (QWDs), with InGaAs QWDs showing promising potential for applications in lasers and optical devices. The results demonstrate specific gain characteristics of InGaAs QWDs, making them suitable for use in lasers, superluminescence diodes, and optical amplifiers.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Valeria Sheina, Guillaume Lang, Vasily Stolyarov, Vyacheslav Marchenkov, Sergey Naumov, Alexandra Perevalova, Jean-Christophe Girard, Guillemin Rodary, Christophe David, Leonnel Romuald Sop, Debora Pierucci, Abdelkarim Ouerghi, Jean-Louis Cantin, Brigitte Leridon, Mahdi Ghorbani-Asl, Arkady V. Krasheninnikov, Herve Aubin
Summary: The authors investigated Br-doped 2H-MoTe2 semiconductor using electron spin resonance and scanning tunneling spectroscopy. They found that the dopant orbitals hybridize to the Q-valleys of the conduction band, resulting in long-lived spin states. Doping 2D materials is an effective way to engineer properties of interest such as catalysis and quantum bits.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Manh-Huong Phan, M. Tuan Trinh, Tatiana Eggers, Vijaysankar Kalappattil, Ken-ichi Uchida, Lilia M. Woods, Mauricio Terrones
Summary: This paper discusses the characteristics of 2D van der Waals magnetic semiconductors and their research in combination with light and the spin Seebeck effect, aiming to explore a new strategy for optical control of SSE and drive the development of spin-caloritronics research.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Yoji Kunihashi, Yasushi Shinohara, Sho Hasegawa, Hiroyuki Nishinaka, Masahiro Yoshimoto, Katsuya Oguri, Hideki Gotoh, Makoto Kohda, Junsaku Nitta, Haruki Sanada
Summary: The incorporation of heavy atoms into semiconductor heterostructures can enhance the spin-orbit interaction of carriers moving in two-dimensional channels. In this study, we investigated the strength of spin-orbit interaction in a GaAsBi channel. Our findings showed the existence of Rashba-type spin-orbit effective magnetic fields experienced by the photo-injected spins diffusing in the GaAsBi layer.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Konstantin A. Ivanov, Alexey M. Nadtochiy, Natalia V. Kryzhanovskaya, Sergey A. Mintairov, Nikolay A. Kalyuzhnyy, Ivan A. Melnichenko, Mikhail V. Maximov, Alexey E. Zhukov
Summary: The paper investigates the dynamic properties of InGaAs quantum well-dots (QWD) embedded in a GaAs matrix using time-resolved photoluminescence (TRPL) at temperatures ranging from 10 to 300 K. The experimental results confirm the theoretical calculations based on a two-level system model, indicating no need to consider the residual 2D quantum well. The absence of nonradiative recombination suggests a high-quality structure. Microscopic properties of the electron and hole states in QWDs are obtained for the first time, including a radiative lifetime of 700 ps and barriers of 50 and 150 meV for electrons and holes, respectively. The carrier capture time is found to be in the range of 10-30 ps.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Jingtao Liu, Hang Li, Xiaohui Liu, Ying Wang, Yingnan Guo, Shufang Wang, Guangsheng Fu, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo, Baolai Liang
Summary: This study investigates carrier injection hybrid structures, where carriers are injected from an adjacent quantum well into a layer of surface quantum dots. The hybrid structures show enhanced photoluminescence intensity compared to reference surface quantum dots. The best carrier injection efficiency is achieved with a 2.5 nm spacer, demonstrating strong coupling between the quantum well and the surface quantum dots. However, the carrier injection is less efficient than expected due to resonant carrier tunneling and significant carrier loss through nonradiative recombination.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Xiangliu Chen, Yao Xiao, Yang Cheng, Zhicheng Zhang, Yudan Gou, Jun Wang
Summary: The stability of InGaAs/GaAs MQW structure grown by low-temperature metal-organic chemical vapor deposition was studied, and it was found that both MQW grown with triethylgallium and trimethylgallium exhibited a blue-shift after annealing. The MQW grown with triethylgallium showed better thermal stability. Furthermore, a vertical external cavity surface emitting laser was fabricated based on the MQW grown with triethylgallium.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
Mikhail V. Maximov, Nikita Yu. Gordeev, Yuri M. Shernyakov, Grigoriy O. Kornyshov, Artem A. Beckman, Alexey S. Payusov, Sergey A. Mintairov, Nikolay A. Kalyuzhnyy, Marina M. Kulagina, Alexey E. Zhukov
Summary: The applicability of InGaAs/GaAs quantum well-dots (QWDs) for active regions of broadband superluminescent diodes (SLDs) emitting in the 950-1150 nm spectral range was studied. It was found that SLDs with an active region based on seven chirped QWD layers could achieve emission spectra centered at 1030 nm with a full-width at half-maximum of 80 nm.
Article
Chemistry, Physical
V. N. Mantsevich, D. S. Smirnov
Summary: We propose a mechanism for current-induced spin polarization in semiconductor heterostructures based on the complex structure of the valence band. By coupling a quantum dot and quantum wire with heavy holes, an exponentially small bias can create 100% spin polarization in the quantum dot, in contrast to traditional mechanisms based on linear momentum spin-orbit coupling. This effect is related to the formation of chiral quasi bound states and the spin-dependent tunneling of holes.
NANOSCALE HORIZONS
(2022)
Article
Physics, Applied
Ayuki Arikawa, Yasuhito Saito, Koichi Nakanishi, Shota Sato, Kyohei Sugaya, Nobuhide Yokota, Makoto Kohda, Ken Morita
Summary: In this study, room-temperature spin relaxation rates in narrow-gap quantum wells were determined using microscopic and macroscopic Kerr rotation measurements. The results showed that even in asymmetric quantum wells with large spin-orbit parameters, the spin relaxation rate resulting from the Elliot-Yafet mechanism was approximately double the average spin relaxation rate resulting from the D'yakonov-Perel mechanism. Furthermore, the anisotropy of spin relaxation time due to the D'yakonov-Perel mechanism was significantly weakened in systems where the Elliot-Yafet mechanism dominated spin relaxation.
APPLIED PHYSICS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Yuta Suzuki, Yuma Kitagawa, Shin-ichiro Tezuka, Hiroshi Akera
Summary: In this paper, we propose a method to generate a spin current using the locally generated antiparallel current-induced spin polarization (CISP) in a system with inversion symmetry. By selectively contacting a sublattice with an electrode, the local CISP can be extracted. The results show that when the Fermi energy is high enough, the magnitude of the spin current, which is proportional to the antiparallel CISP, increases with the interwell tunnel coupling and can reach twice the value of a decoupled quantum well with broken inversion symmetry.
Article
Physics, Applied
Oksana Chubenko, Siddharth Karkare, Dimitre A. Dimitrov, Jai Kwan Bae, Luca Cultrera, Ivan Bazarov, Andrei Afanasev
Summary: The anticorrelation between quantum efficiency (QE) and electron spin polarization (ESP) in p-doped GaAs is studied using a Monte Carlo approach, showing that the behavior can be explained by bulk relaxation mechanisms and the time electrons spend in the material.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Quantum Science & Technology
N. Coste, M. Gundin, D. A. Fioretto, S. E. Thomas, C. Millet, E. Mehdi, N. Somaschi, M. Morassi, M. Pont, A. Lemaitre, N. Belabas, O. Krebs, L. Lanco, P. Senellart
Summary: Spins in semiconductor quantum dots (QDs) are promising local quantum memories for generating polarization-encoded photonic cluster states. By utilizing acoustic phonon-assisted excitation, the polarization selective optical transitions can be fully exploited to initialize and measure single spin states. Through monitoring the spin Larmor precession during the radiative emission process of an excited state or in the QD ground state, we achieve a spin state detection fidelity of 94.7 +/- 0.2% and a hole spin coherence time of 25 +/- 5 ns, demonstrating the potential of this scheme and system for generating linear cluster states with a dozen of photons.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
P. S. Alekseev, M. O. Nestoklon
Summary: In this study, it was found that the charge density of 2D electrons can significantly affect the Dresselhaus interaction in symmetric quantum wells. By internal electric field renormalization, this effect may play an important role in quantitative studies of spin-dependent phenomena in quantum wells.
Article
Physics, Multidisciplinary
Sangita R. Panda, Manoranjan Pradhan, Trinath Sahu, Ajit Kumar Panda
Summary: This study investigates the effect of asymmetric doping concentrations on the electron mobility in GaAs/InGaAs-based single and double quantum well pseudomorphic high electron mobility transistor structures. The results show that different doping concentrations lead to asymmetric distributions of subband wave functions, which in turn influence the subband mobility. It is found that increasing the doping concentration of one layer in a single quantum well structure enhances the mobility nonlinearly. In double quantum well structures, the distribution of subband wave functions changes depending on the relative doping concentrations, resulting in a nonlinear variation of the mobility.
Article
Chemistry, Multidisciplinary
Erik Kirstein, Evgeny A. . Zhukov, Dmitri R. . Yakovlev, Nataliia E. Kopteva, Carolin Harkort, Dennis Kudlacik, Oleh Hordiichuk, Maksym V. Kovalenko, Manfred Bayer
Summary: This research investigates the coherent spin dynamics of Ruddlesden-Popper (PEA)2PbI4 perovskites through picosecond pump-probe Kerr rotation experiments in an external magnetic field. The study identifies the Larmor spin precession of resident electrons with a spin dephasing time of 190 ps, as well as a long longitudinal spin relaxation time of 25 μs in weak magnetic fields. A significant anisotropy of the electron g-factor is also found, with in-plane value of +2.45 and out-of-plane value of +2.05. Furthermore, the exciton out-of-plane g-factor is measured to be +1.6 using magneto-reflectivity. This work contributes to the understanding of the spin-dependent properties and spin dynamics of two-dimensional perovskites.
Article
Physics, Applied
Carolin Lueders, Jano Gil-Lopez, Markus Allgaier, Benjamin Brecht, Marc Assmann, Christine Silberhorn, Manfred Bayer
Summary: Streak cameras are commonly used devices with picosecond time resolution to measure pulsed emission, but they are not efficient in detecting infrared and telecom signals. In this study, we present a frequency conversion technique based on sum-frequency generation, which allows the detection of infrared signals in the visible range using a streak camera while preserving their temporal properties. The functionality of our device is demonstrated by converting the emission from a quantum dot laser.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Junliang Wang, Hermann Edlbauer, Aymeric Richard, Shunsuke Ota, Wanki Park, Jeongmin Shim, Arne Ludwig, Andreas D. Wieck, Heung-Sun Sim, Matias Urdampilleta, Tristan Meunier, Tetsuo Kodera, Nobu-Hisa Kaneko, Hermann Sellier, Xavier Waintal, Shintaro Takada, Christopher Bauerle
Summary: This research reports the observation of single-photon partitioning during the synchronous shuttling process of a pair of single electrons through a surface acoustic wave, demonstrating the repulsion predominantly caused by Coulomb interaction. This experiment marks an important milestone in realizing controlled-phase gates for in-flight quantum manipulations.
NATURE NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Natasha Tomm, Sahand Mahmoodian, Nadia O. Antoniadis, Ruediger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Alisa Javadi, Richard J. Warburton
Summary: The interaction between photons and a single two-level atom is a fundamental concept in quantum physics, revealing nonlinearity and the emergence of photon bound states. The observation of a photon-number-dependent time delay in the scattering off a single artificial atom confirms the existence of stimulated emission and demonstrates the dependence of scattering dynamics on the number of photons involved in the light-matter interaction.
Article
Chemistry, Multidisciplinary
Carolin Harkort, Dennis Kudlacik, Natalia E. E. Kopteva, Dmitri R. R. Yakovlev, Marek Karzel, Erik Kirstein, Oleh Hordiichuk, Maksym V. V. Kovalenko, Manfred Bayer
Summary: This article discusses the optical properties and spin phenomena of Ruddlesden-Popper type (PEA)(2)PbI4 perovskites. The Zeeman splitting of electrons and holes in a magnetic field was measured using spin-flip Raman scattering. The electron and hole g factors were evaluated, their anisotropies were measured, and the dynamic nuclear spin polarization induced by spin-polarized holes was detected.
Article
Multidisciplinary Sciences
E. Kirstein, N. E. Kopteva, D. R. Yakovlev, E. A. Zhukov, E. V. Kolobkova, M. S. Kuznetsova, V. V. Belykh, I. A. Yugova, M. M. Glazov, M. Bayer, A. Greilich
Summary: The spin dynamics and interaction of confined electrons or holes in perovskite nanocrystals are investigated using time resolved optical spectroscopy. Spin mode locking effect and nuclear focusing are observed in CsPb(Cl0.56Br0.44)(3) lead halide perovskite nanocrystals embedded in a glass matrix. The measured spin coherence time and spin dephasing time are 13 ns and a nanosecond respectively, and the developed theoretical model agrees well with the experimental data.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov, D. Kudlacik, S. V. Nekrasov, Yu G. Kusrayev, D. R. Yakovlev, M. Bayer
Summary: This study investigated exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots with indirect band gap and type-I band alignment. The anisotropic exchange interaction in these quantum dots was found to be negligible, enabling the formation of spin-polarized bright excitons under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons were controlled by the hyperfine interaction between the electron and nuclear spins. A kinetic model was developed to quantitatively describe the experimental data, taking into account the population dynamics of the bright and dark exciton states as well as the spin dynamics.
Article
Quantum Science & Technology
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, David Niegemann, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Baeuerle, Matias Urdampilleta, Tristan Meunier
Summary: We propose a protocol to achieve complete spin state readout of a two-electron system in a double quantum dot probed by an electrometer. This is done through repetitive single-shot measurements using Pauli spin blockade and our ability to tune the detuning and interdot tunnel coupling on fast timescales. By performing three distinct manipulations and measurements, we can determine if the spins are in the S, T0, T+, or T- state. This work addresses an important challenge of reducing the overhead for spin readout in scaling up spin-qubit platforms.
Article
Physics, Applied
H. Mannel, J. Kerski, P. Lochner, M. Zoellner, A. D. Wieck, A. Ludwig, A. Lorke, M. Geller
Summary: In this study, the electron spin and trion dynamics in a single self-assembled quantum dot were investigated using time-resolved resonance fluorescence. It was found that the combination of Auger recombination and electron tunneling can flip the electron spin, which limits the spin lifetime.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Olga O. Smirnova, Ina V. Kalitukha, Anna V. Rodina, Grigorii S. Dimitriev, Victor F. Sapega, Olga S. Ken, Vladimir L. Korenev, Nikolai V. Kozyrev, Sergey V. Nekrasov, Yuri G. Kusrayev, Dmitri R. Yakovlev, Benoit Dubertret, Manfred Bayer
Summary: This study investigates the optical alignment and orientation of excitons in colloidal nanoplatelets and evaluates their properties through theoretical analysis and experimental data.
Article
Chemistry, Multidisciplinary
Sergey R. Meliakov, Evgeny A. Zhukov, Evgeniya V. Kulebyakina, Vasilii V. Belykh, Dmitri R. Yakovlev
Summary: Coherent spin dynamics of charge carriers in CsPbBr3 perovskite nanocrystals were investigated using time-resolved pump-probe Faraday rotation and differential transmission techniques in a temperature range of 4-300 K and magnetic fields up to 500 mT. Electron spin Larmor precession was observed throughout the temperature range, and hole spin precession was also observed at temperatures below 50 K. The temperature dependence of spin-related parameters, such as Lande g-factor and spin dephasing time, were measured and analyzed. Photocharging of the nanocrystals with either electrons or holes was found to depend on the sample cooling regime, and the type of charge carrier could be identified through carrier spin Larmor precession.
Article
Energy & Fuels
Gerrit Karl Mertin, Dominik Wycisk, Ernst Richter, Marc Oldenburger, Markus Hans Hofmann, Till Hauke Luetje, Manuel Manz, Henry Luu, Andreas Dirk Wieck, Kai Peter Birke
Summary: This study analyzed and compared the voltage and entropy of two lithium-ion battery cells with silicon-graphite blended anodes and a graphite only cell. The results showed that both voltage and entropy had significant hysteresis based on the charge/discharge history and increased with the proportion of silicon. However, the impact of silicon on the cell's entropy behavior was marginal, indicating that the behavior was influenced mainly by the graphite. Furthermore, the entropy hysteresis of the anode disappeared when plotted against its half cell potential, suggesting a difference between the measured entropy at a cell level and the effective entropy of the electrode during operation.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
V. O. Kozlov, N. S. Kuznetsov, A. N. Kamenskii, A. Greilich, I. I. Ryzhov, G. G. Kozlov, V. S. Zapasskii
Summary: Spin noise spectroscopy is a magnetic resonance technique that detects spin precession by analyzing fluctuations in magnetization. The Faraday-rotation (FR) noise spectrum at Larmor frequency is used for detection. The conventional laws of spin noise detection, which state that the FR noise should only be detectable in the Voigt geometry, may be changed in crystals with anisotropic paramagnetic centers, allowing the FR noise to be detected in the Faraday geometry. Experimental studies on CaF2 crystals with tetragonal Nd3+ ions confirm these findings.
