Article
Nanoscience & Nanotechnology
Jyoti Biswas, Luca Cultrera, Wei Liu, Erdong Wang, John Skaritka, Kim Kisslinger, S. D. Hawkins, S. R. Lee, J. F. Klem
Summary: Photocathodes based on GaAs and other III-V semiconductors are capable of producing highly spin-polarized electron beams. A GaAs/GaAsP superlattice photocathode with a Distributed Bragg Reflector (DBR) underneath was fabricated to increase the quantum efficiency (QE). The configuration of a Fabry-Perot cavity between the DBR and GaAs surface enhances the absorption of incident light, resulting in a higher QE. These photocathode structures achieved record quantum efficiencies exceeding 15% and electron spin polarization of about 75% when illuminated with near-bandgap photon energies.
Article
Chemistry, Physical
Myles A. Steiner, Ryan M. France, Jeronimo Buencuerpo, John F. Geisz, Michael P. Nielsen, Andreas Pusch, Waldo J. Olavarria, Michelle Young, Nicholas J. Ekins-Daukes
Summary: High-efficiency solar cells are crucial for various applications, with lower energy bandgaps achieved through the use of multiple quantum wells. Incorporating strain-balanced GaAsP/GaInAs QWs into solar cells has led to increased efficiency.
ADVANCED ENERGY MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Pramita Nath, Abhijit Biswas
Summary: This paper investigates the photovoltaic performance enhancement of a p-GaAsP/i-GaAs/n-GaAsP solar cell by varying the thickness of the intrinsic layer, molar contents of As in the GaAsP alloy, and the choice of cap layer materials. The optimized solar cell features a 60 nm thick intrinsic layer, 90% molar content of As in GaAsP alloy, and Al0.8Ga0.2As as the cap layer, achieving a short circuit current density of 26.50 mA/cm(2), open circuit voltage of 1.085 V, fill-factor of 0.89, and power conversion efficiency of 25.60% under AMI.5G solar spectrum.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2023)
Article
Materials Science, Multidisciplinary
J. Y. Kim, M. Samiepour, E. Jackson, J. Ryu, D. Iizasa, T. Saito, M. Kohda, J. Nitta, H. E. Beere, D. A. Ritchie, A. Hirohata
Summary: In this work, the fabrication of a Fe/n-GaAs spin injection device and the experimental setup for optical gating of the nonlocal spin transport signal were demonstrated. The results showed more uniform current distribution at the Fe/n-GaAs injector interface at bias voltages higher than the Schottky barrier height. Successful spin injection into n-GaAs was confirmed through three- and four-terminal Hanle measurements, with strong interfacial spin dephasing at high magnetic fields. Using a time-resolved pump-probe Kerr rotation setup, a modulation of the nonlocal signal (0.4 +/- 0.3)% depending on the light helicity was observed in Fe/n-GaAs lateral spin injection devices at 30 K.
Article
Physics, Condensed Matter
Lu-Lu Chang, Qing-Ping Wu, Ruo-Long Zhang, Yu-Zeng Li, Mei-Rong Liu, Xian-Bo Xiao, Zheng-Fang Liu
Summary: The study demonstrates that the spin- and valley-dependent energy gap in ferromagnetic silicene superlattice can be well tuned via off-resonant circularly polarized light, leading to fully spin and valley-polarization. Moreover, adjusting the energy of the light field can abruptly reverse valley polarization from 100% to -100%.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Optics
Steven Ruder, Tom Earles, Christian Galstad, Michael Klaus, Don Olson, Luke J. Mawst
Summary: This study compares three types of GaAsP metamorphic buffer layers for virtual substrates in red laser diode heterostructures. The results show that using tensile-strained quantum wells on standard GaAs substrates and compressively strained quantum wells on metamorphic superlattices achieve TM-polarized and TE-polarized emission, respectively.
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
Nanoscience & Nanotechnology
Qiuhui Li, Shibo Fang, Shiqi Liu, Lin Xu, Linqiang Xu, Chen Yang, Jie Yang, Bowen Shi, Jiachen Ma, Jinbo Yang, Ruge Quhe, Jing Lu
Summary: This study investigates the performance of hydrogenated monolayer GaAs in field-effect transistors (FETs) and finds its potential application in high-performance and low-power settings. Specifically, p-type devices with 2% uniaxial compressive strain and unstrained n-type devices exhibit symmetrical performance in high-performance applications, making ultrathin GaAs suitable for complementary MOS integrated circuits.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Xiao Lin Zeng, Yu Liu, Yang Zhang, Jing Wu, Shen Bo Zhu, Yong Hai Chen
Summary: Electrically generated spin accumulation due to the spin Hall effect of Pt/GaAs is detected by circular polarized photoconductivity (CPPC). The observed degree of circular polarization strongly suggests that Pt and GaAs have the same spin accumulation length in the Pt/GaAs heterostructure.
Article
Nanoscience & Nanotechnology
Kian Hua Tan, Wan Khai Loke, Satrio Wicaksono, Soon Fatt Yoon
Summary: In this study, the growth of an InAs0.32Sb0.68 layer on GaAs substrates was achieved by accommodating lattice mismatch strain, reducing threading dislocation density, and providing a novel approach for the growth of InAs0.32Sb0.68 material on widely available GaAs substrates.
Article
Engineering, Electrical & Electronic
Cheng Feng, Jian Liu, Yijun Zhang, Yunsheng Qian, Jing Zhao
Summary: Two kinds of complex structures for GaAs based photocathodes are proposed to enhance their photoemission capabilities. Experimental and simulated calculations are conducted to compare the optical properties of the two structures. The results show significant differences in photoelectric performance between the two photocathodes, with complex effects of different parameters on optical properties and a significant influence of the emission layer on absorptivity values.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Green & Sustainable Science & Technology
Shubham Chamola, Shahab Ahmad
Summary: Photorechargeable Li-ion batteries (Li-PRBs) have been investigated as potential energy devices for remote IoT or electronic devices due to their lightweight and low-cost advantages. This study demonstrates the use of conversion type active material α-Fe2O3 for efficient and stable operation of Li-PRBs. α-Fe2O3 nanorods blended with conducting additives showed simultaneous solar energy harvesting and efficient Li-ion storage. Li-PRBs using α-Fe2O3 exhibited a photoconversion and storage efficiency of approximately 1.988% when illuminated with a blue LED.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Svetlana Polivtseva, Joseph Olanrewaju Adegite, Julia Kois, Damir Mamedov, Smagul Zh. Karazhanov, Jelena Maricheva, Olga Volobujeva
Summary: A novel approach using SbCl3/glycerol-based thermochemical treatment has been proposed to control anisotropy in Sb2Se3, providing a simple and scalable alternative to physical selenium post-processing. This method successfully addresses the severe problem of anisotropy and results in high-quality compact thin films with favorable morphology, stoichiometric composition, and crystallographic orientation for improved device performance.
Article
Engineering, Electrical & Electronic
Xiaohua Yu, Zude Jin, Guirong Shao
Summary: In this study, a high-temperature cleaning experiment was conducted, and it was found that 5-phase transformation reactions occurred during the process. Energy and electronic structure of 10 adsorbed surface models were researched using first-principles calculation method. The results showed that Gibbs free energy and adsorption energy favored the phase transformations, and analysis was done on changes in bonding, electron distribution, and charge distribution during the phase transitions.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Ming-Yang Feng, Shuang Zhou, Yi-Fang Zhang, Ya-Ping Wang, Chun-Yan Fu, Jian-Wen Li, Yuan-Lang Wan, Zhi-Jia Zhang, Yong Jiang, An-Qiang Pan
Summary: The interfacial characteristics of the Li metal anode are crucial for its overall performance. Researchers have found that modifying the carbon cloth framework using ferromagnetic metal/LiF heterogeneous films can greatly enhance the electrochemical performance. The improved performance is attributed to the spin-polarized interface contributed by the Co/LiF heterostructure.
Article
Physics, Applied
Shunya Matsuba, Keigo Kawase, Atsushi Miyamoto, Shigemi Sasaki, Masaki Fujimoto, Taro Konomi, Naoto Yamamoto, Masahito Hosaka, Masahiro Katoh
APPLIED PHYSICS LETTERS
(2018)
Article
Physics, Nuclear
Naoto Yamamoto, Takeshi Takahashi, Shogo Sakanaka
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2018)
Article
Physics, Applied
Xiuguang Jin, Burak Ozdol, Masahiro Yamamoto, Atsushi Mano, Naoto Yamamoto, Yoshikazu Takeda
APPLIED PHYSICS LETTERS
(2014)
Article
Physics, Applied
Xiuguang Jin, Alexandre A. C. Cotta, Gong Chen, Alpha T. N. Diaye, Andreas K. Schmid, Naoto Yamamoto
JOURNAL OF APPLIED PHYSICS
(2014)
Article
Physics, Multidisciplinary
E. Roussel, C. Evain, M. Le Parquier, C. Szwaj, S. Bielawski, M. Hosaka, N. Yamamoto, Y. Takashima, M. Shimada, M. Adachi, H. Zen, S. Kimura, M. Katoh
NEW JOURNAL OF PHYSICS
(2014)
Article
Instruments & Instrumentation
N. Yamamoto, H. Zen, M. Hosaka, T. Konomi, M. Adachi, K. Hayashi, J. Yamazaki, Y. Takashima, M. Katoh
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2014)
Article
Physics, Multidisciplinary
E. Roussel, C. Evain, C. Szwaj, S. Bielawski, J. Raasch, P. Thoma, A. Scheuring, M. Hofherr, K. Ilin, S. Wuensch, M. Siegel, M. Hosaka, N. Yamamoto, Y. Takashima, H. Zen, T. Konomi, M. Adachi, S. Kimura, M. Katoh
PHYSICAL REVIEW LETTERS
(2014)
Article
Physics, Nuclear
M. Hosaka, N. Yamamoto, Y. Takashima, C. Szwaj, M. Le Parquier, C. Evain, S. Bielawski, M. Adachi, H. Zen, T. Tanikawa, S. Kimura, M. Katoh, M. Shimada, T. Takahashi
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
(2013)
Article
Instruments & Instrumentation
Y. Taira, H. Toyokawa, R. Kuroda, N. Yamamoto, M. Adachi, S. Tanaka, M. Katoh
REVIEW OF SCIENTIFIC INSTRUMENTS
(2013)
Article
Multidisciplinary Sciences
M. Katoh, M. Fujimoto, N. S. Mirian, T. Konomi, Y. Taira, T. Kaneyasu, M. Hosaka, N. Yamamoto, A. Mochihashi, Y. Takashima, K. Kuroda, A. Miyamoto, K. Miyamoto, S. Sasaki
SCIENTIFIC REPORTS
(2017)
Article
Physics, Multidisciplinary
Yosuke Honda, Miho Shimada, Alexander Aryshev, Ryukou Kato, Tsukasa Miyajima, Takashi Obina, Ryota Takai, Takashi Uchiyama, Naoto Yamamoto
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Nuclear
Yosuke Honda, Miho Shimada, Alexander Aryshev, Ryukou Kato, Tsukasa Miyajima, Takashi Obina, Ryota Takai, Takashi Uchiyama, Naoto Yamamoto
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2019)
Article
Instruments & Instrumentation
Shin-ichi Kimura, Taishi Kawabata, Hiroki Matsumoto, Yu Ohta, Ayuki Yoshizumi, Yuto Yoshida, Takumi Yamashita, Hiroshi Watanabe, Yoshiyuki Ohtsubo, Naoto Yamamoto, Xiuguang Jin
Summary: This study has developed spin-resolved resonant electron energy-loss spectroscopy with high energy resolution using a GaAs/GaAsP photocathode, allowing for element- and spin-selective observations. The methodology is expected to provide novel information about elementary excitations through resonant inelastic x-ray scattering and resonant photoelectron spectroscopy.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Physics, Nuclear
Takaaki Yamaguchi, Shogo Sakanaka, Naoto Yamamoto, Daichi Naito, Takeshi Takahashi
Summary: The static Robinson instability and associated coherent synchrotron frequencies were investigated at the Photon Factory (PF) 2.5-GeV storage ring at KEK. Experimental observations showed consistent results with theoretical predictions based on the uniformly filled point-bunch model, but discrepancies were found when additional coherent-frequency measurements were taken. An unexpected sharp peak at approximately 5.2 kHz was observed under conditions close to the Robinson limit, along with deviations in both the frequency and damping rate of the coherent oscillation. These findings emphasize the need for further experimental and theoretical studies on the static Robinson instability.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2023)
