Article
Chemistry, Physical
Meiyu He, Jiayue Han, Xingwei Han, Jun Gou, Ming Yang, Zhiming Wu, Yadong Jiang, Jun Wang
Summary: In a bilayer enhanced graphene/C-60/ZnPc phototransistor, the thickness-dependent photocurrent polarity can be influenced by type-II band alignment and valid interfaces, resulting in fast response time and high responsivity.
Article
Optics
Jingjing Wang, Tan Tu, Feng Zhang, Fengjiao Shen, Jian Xu, Zhengsong Cao, Xiaoming Gao, Stephane Plus, Weidong Chen
Summary: A near-infrared broadband laser heterodyne radiometer (LHR) with a tunable external-cavity diode laser is developed for atmospheric sensing. The LHR spectra recorded in the spectral region of 6248.5-6256 cm(-1) allow the retrieval of column-averaged dry-air mixing ratio of CO2 in Dunkirk, France. The results are consistent with GOSAT and TCCON data, indicating the high potential of the near-infrared external-cavity LHR for spacecraft and ground-based atmospheric sensing.
Article
Optics
Kevin M. Dorney, Tingting Fan, Quynh L. D. Nguyen, Jennifer L. Ellis, Daniel D. Hickstein, Nathan Brooks, Dmitriy Zusin, Christian Gentry, Carlos Hernandez-Garcia, Henry C. Kapteyn, Margaret M. Murnane
Summary: The study extends the photon energy range of circularly polarized high-harmonics and generates single-helicity HHG spectra using counter-rotating femtosecond laser pulses. Circularly polarized soft x-ray harmonics beyond 170 eV are produced in helium, while dense spectra at high photon energies are generated in an argon medium, consistent with the generation of circularly polarized attosecond pulses. Theoretically, it is shown that circularly polarized HHG photon energies can extend beyond the carbon K edge, broadening the range of accessible molecular and materials systems for dynamic HHG chiral spectro-microscopies.
Article
Optics
Resad Kahvedzic, Stefanie Graefe
Summary: This study analyzes the momentum distribution of photoelectrons emitted by ionization of an atomic target in a strong laser field, revealing that non-dipole corrections lead to a nonzero momentum distribution. Using the saddle-point approximation to compute the integral over ionization times, a negative momentum shift against the radiation pressure force is surprisingly found.
Article
Optics
Yinfu Zhang, Jiapeng Li, Liang Li, Tengfei Huang, Xiaosong Zhu, Pengfei Lan, Peixiang Lu
Summary: The study demonstrates that the injected current in graphene can be effectively enhanced by controlling the orthogonally polarized two-color laser field. The increase in photocurrent is related to the waveform of the laser and quantum interference between the electron trajectories.
Article
Physics, Multidisciplinary
H. Liu, Z. Wang, L. Gao, Y. Huang, H. Tang, X. Zhao, W. Deng
Summary: In this study, a new optofluidic resonating phenomenon was reported, which naturally links optical radiation pressure, total internal reflection, capillary wave, and Rayleigh-Plateau instability. When a transparent liquid jet is radiated by a focused continuous wave laser beam, a highly ordered periodic jet breakup is unexpectedly triggered and maintained. The interaction of the laser beam with the liquid jet results in the periodic transmission of the laser beam and triggers the Rayleigh-Plateau instability.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Kazuyuki Uno, Shohei Watarai, Yasushi Kodama, Kazuyuki Yoneya, Takahisa Jitsuno
Summary: This study investigated the dependence of laser output and discharge voltage on repetition rate and gas pressure by using a longitudinally excited CO2 laser with a large discharge tube. It was found that the laser energy decreased with increasing repetition rate and different gas mixtures had an impact on laser output.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
H. Fujise, M. Uemura, H. Hasegawa, D. Ikeya, A. Matsuda, T. Morishita, L. B. Madsen, F. Jensen, O. Tolstikhin, A. Hishikawa
Summary: The dissociative tunneling ionization of tetrafluoromethane (CF4) in circularly polarized ultrashort intense laser fields has been studied using three-dimensional electron-ion coincidence momentum imaging. It was found that the dissociation occurs efficiently when the laser electric field points from F to C. Additionally, the results also showed a clear dependence on the polarization helicity of the laser fields.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Qing-Hua Ke, Yue-Ming Zhou, Yi-Jie Liao, Jin-Tai Liang, Yong Zhao, Jia Tan, Min Li, Pei-Xiang Lu
Summary: The study investigates the multiphoton ionization of hydrogen atom in two-color circularly polarized laser fields, revealing distinct structures and intensities of sideband peaks under specific conditions, which can be explained by the selection rules of photon-absorption channels.
FRONTIERS OF PHYSICS
(2021)
Article
Optics
A. Mitrofanov, D. A. Sidorov-Biryukov, M. Rozhko, N. Erukhimova, A. A. Voronin, M. M. Nazarov, A. B. Fedotov, A. M. Zheltikov
Summary: Electric-current transients driven by high-peak-power midinfrared laser pulses can provide a source of broadband current, wide-angle microwave-terahertz radiation, with specific polarization properties and radiation patterns, which are important for studying ultrafast laser-plasma interactions.
Article
Materials Science, Multidisciplinary
Ratul Kumar Biswas, Rajani K. Vijayaraghavan, Patrick McNally, Gerard M. O'Connor, Patricia Scully
Summary: The study on the growth kinetics of graphene on Polyimide upon carbon-dioxide laser irradiation shows that optimizing crystal size is essential for achieving maximum electrical conductivity. By using the Arrhenius equation, the research sheds light on the growth kinetics of graphene produced through laser carbonization of polyimide. The peak irradiation temperature for each laser fluence was calculated through a photothermal model solved by Finite Element Analysis in COMSOL software.
Article
Multidisciplinary Sciences
Jia-Wei Wang, Li-Zhen Qiao, Hao-Dong Nie, Hai-Hua Huang, Yi Li, Shuang Yao, Meng Liu, Zhi-Ming Zhang, Zhen-Hui Kang, Tong-Bu Lu
Summary: The study demonstrates the construction of metal-organic layers with ordered structure and molecular tunability using graphene oxide as both template and electron mediator, leading to excellent CO2 photoreduction performance.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Roberto Boyero-Garcia, Ana Garcia-Cabrera, Oscar Zurron-Cifuentes, Carlos Hernandez-Garcia, Luis Plaja
Summary: Recent studies have shown that high-order harmonic generation (HHG) in solid targets exhibits rich electronic dynamics compared to atomic and molecular cases. The imperfect recollisions of electron-hole pairs play a significant role in HHG emission, reflecting the quantum nature of the process. This study demonstrates the signature of imperfect recollisions in monolayer graphene and highlights the contribution of imperfect multiple-order recollisions in the harmonic emission.
Article
Engineering, Multidisciplinary
Ming Liu, JiaNan Wu, HuanYu Cheng
Summary: The technique of carbonization of polyimide by direct laser writing to create laser-induced graphene sensors and devices is flexible and versatile. The effects of laser parameters on the microstructure, thickness, and sheet resistance of LIG were investigated, revealing that LIG is composed of multiple graphene layers and its specific surface area decreases with increasing laser power. The expansibility of LIG is characterized by the ratio of its thickness to the depth of the carbonized PI film.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Hasib Mahbub, Mohammad A. Saed, Mahdi Malmali
Summary: Graphene is a promising material for flexible heaters due to its high thermal conductivity. Laser-induced graphene (LIG), fabricated by laser ablation of polymeric substrates, is a cost-effective and chemical-free method. This study demonstrates the fabrication of patterned LIG-based flexible heaters and their excellent response to RF electromagnetic waves.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Biographical-Item
Physics, Applied
Alexel Kalaboukhov, Oleg V. Snigirev, Andrey L. Pankratov, Dag Winkler, Tord Claeson, Konstantin K. Likharev, Sergey Kubatkin
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Multidisciplinary Sciences
Kai-Qiang Lin, Jonas D. Ziegler, Marina A. Semina, Javid Mamedov, Kenji Watanabe, Takashi Taniguchi, Sebastian Bange, Alexey Chernikov, Mikhail M. Glazov, John M. Lupton
Summary: The authors observed tightly bound, valley-polarized, UV-emissive trions in monolayer transition metal dichalcogenide transistors. These trions have markedly different optical selection rules compared to band-edge trions and their properties can be controlled by an electrical gate, enabling excitonic quantum interference.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Koloman Wagner, Zakhar A. Iakovlev, Jonas D. Ziegler, Marzia Cuccu, Takashi Taniguchi, Kenji Watanabe, Mikhail M. Glazov, Alexey Chernikov
Summary: This study demonstrates the diffusion of excitons in a monolayer semiconductor with a continuously tunable Fermi sea of free charge carriers. The light emission from tightly bound exciton states in electrically gated WSe2 monolayer is detected using microscopy. The measurements reveal a nonmonotonic dependence of the exciton diffusion coefficient on the charge carrier density.
Article
Optics
Hui Ma, Yaojie Zhu, Yonghai Chen, Chongyun Jiang
Summary: In this study, we investigate the optical tuning of Rashba and Dresselhaus spin-orbit coupling (SOC) through monitoring the spin-galvanic effect (SGE) in a GaAs/Al0.3Ga0.7As two dimensional electron gas. The experimental results reveal different tunabilities of Rashba and Dresselhaus-related SGE currents, and the ratio of their coefficients decreases with the power of the control light, indicating the formation of the inverse persistent spin helix state. Phenomenological and microscopic analysis shows that the Rashba SOC exhibits greater optical tunability compared to the Dresselhaus SOC.
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
Materials Science, Multidisciplinary
Z. A. Iakovlev, M. M. Glazov
Summary: The fine structure of attractive Fermi polarons in van der Waals heterostructures based on monolayer TMDs in the presence of elastic strain is studied theoretically. The strain-induced fine structure splitting in neutral excitons is absent in charged excitons (trions). The fine structure splitting of the attractive Fermi polaron is proportional to both the excitonic splitting and the Fermi energy.
Article
Nanoscience & Nanotechnology
Naveen Shetty, Hans He, Richa Mitra, Johanna Huhtasaari, Konstantina Iordanidou, Julia Wiktor, Sergey Kubatkin, Saroj P. Dash, Rositsa Yakimova, Lunjie Zeng, Eva Olsson, Samuel Lara-Avila
Summary: We introduce a reliable and scalable method for fabricating electrical contacts to two-dimensional materials using a tri-layer resist system. This method produces high-quality contacts in devices based on epitaxial graphene on silicon carbide and enables field-effect transistor behavior in transition metal dichalcogenide molybdenum disulfide. The demonstrated fabrication route offers flexibility in contact metallization and is crucial for practical devices and studying emerging materials' electrical properties.
ACS APPLIED NANO MATERIALS
(2023)
Article
Instruments & Instrumentation
Naveen Shetty, Tobias Bergsten, Gunnar Eklund, Samuel Lara Avila, Sergey Kubatkin, Karin Cedergren, Hans He
Summary: In this work, a simple and stable long-term storage technique for epitaxial graphene quantum Hall resistance standards is developed and tested, using readily available materials as the storage environment. The technique shows high stability and can remove barriers for the widespread use of these standards in practical metrology.
Editorial Material
Nanoscience & Nanotechnology
Mikhail M. Glazov
NATURE NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Marina A. Semina, Javid Mamedov, Mikhail M. Glazov
Summary: We theoretically study neutral and charged excitons, also known as trions, in transition metal dichalcogenides monolayers. We focus on the situation where one of the electrons occupies an excited, high-lying, conduction band characterized by a negative effective mass. We develop the theory for high-lying excitons and trions with negative effective mass and investigate the role of non-parabolicity in the formation of bound states. We also propose simple and accurate trial wavefunctions for calculating the binding energies and compare the results with numerical calculations.
OXFORD OPEN MATERIALS SCIENCE
(2023)
Article
Physics, Applied
G. Kourmoulakis, A. Michail, I. Paradisanos, X. Marie, M. M. Glazov, B. Jorissen, L. Covaci, E. Stratakis, K. Papagelis, J. Parthenios, G. Kioseoglou
Summary: In this study, we investigate the impact of biaxial tensile strain on the optical properties of WS2 monolayers using micro-photoluminescence and Raman experiments. Our findings reveal a significant shift in the neutral exciton emission energy, as well as a decrease in circular polarization degree under the applied strain. Through experimental analysis, we separate the effect of strain-induced energy detuning and evaluate the pure effect of biaxial strain. Our analysis suggests that the suppression of circular polarization degree under biaxial strain is influenced by an interplay of energy and polarization relaxation channels, as well as changes in the exciton oscillator strength affecting the long-range exchange interaction.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
M. M. Glazov
Summary: In this study, a model of the coherent exciton spin-valley dynamics in two-dimensional transition-metal dichalcogenides under elastic strain is developed. It is found that strain causes the exciton pseudospin to experience an effective magnetic field, leading to the precession of the pseudospin. The circular polarization of excitons oscillates with time under circularly polarized excitation, and a time-oscillating linear polarization appears. The competition between the strain-induced effective magnetic field and the field caused by the exciton longitudinal-transverse splitting results in different regimes of coherent spin dynamics of two-dimensional excitons.
Article
Materials Science, Multidisciplinary
M. M. Glazov, L. E. Golub
Summary: We develop a theory for the spin and valley Hall effects in two-dimensional systems caused by asymmetricskew-scattering. The results show that the scattering asymmetry only appears in processes where interaction between particles in the initial and intermediate states is present. For degenerate electrons or nondegenerate particles, the spin and valley currents induced by interparticle collisions are suppressed, and their steady-state values are proportional to the squared temperature or density, respectively. The study also demonstrates strong deviations from the conventional picture of interparticle scattering for the skew scattering of two-dimensional degenerate bosons, such as excitons or exciton polaritons.
Article
Physics, Multidisciplinary
M. M. Glazov, E. L. Ivchenko, M. O. Nestoklon
Summary: In this study, a six-band kp model is used to describe the band structure of tellurium and analyze the effect of hydrostatic deformation. The parameterization of the kp Hamiltonian is determined and the band transformation upon gap closing is traced in the kp method. The research shows that, under certain conditions, the gap in the tellurium spectrum does not close when calculated using the DFT method.
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
T. S. Shamirzaev, D. R. Yakovlev, N. E. Kopteva, D. Kudlacik, M. M. Glazov, A. G. Krechetov, A. K. Gutakovskii, M. Bayer
Summary: Charged exciton recombination and spin dynamics in ultrathin InSb and AlSb quantum wells with an AlAs matrix were studied, revealing strong material intermixing and band alignment types. The circular polarization of photoluminescence Pc induced by a magnetic field showed nonmonotonic behavior at high magnetic fields. A kinetic equation model was developed to interpret the experiment and determine trion radiative lifetimes, spin relaxation times, and heavy-hole g factors for the studied structures.
