- by Jiewen Min, Xingyuan Ou, Xiong Liu, Yao Tong and Mengshi ZhouThe built-in electric field in heterojunction photocatalysts can advance the separation of photo-generated electrons and holes. The Janus structure also plays a decisive role in adjusting charge transfer. Combining these two factors, a new Janus heterojunction can be constructed, which can further enhance the regulating effect of the built-in electric field on charge transfer. Based on first-principles calculations, we found that Janus heterojunctions, SGaInSe/SInGaTe and TeGaInS/SeInGaTe are highly potential and efficient photocatalysts for water splitting. Compared to traditional heterojunctions, Janus […]
- by Zihan Yang, Shuai Li, Yijie Hao, Yao Zhang, Jiajie Wang, Runxi Gao, Yang Cao, Liying Lang, Hanbin Wang, Li Li and Hao TianA novel fabrication method for liquid crystal (LC) devices in the terahertz (THz) band is proposed, utilizing 3D-printed resin substrates as an alternative to conventional quartz/silicon substrates. By combining established LC device manufacturing processes with vertical electric field modulation, this approach achieves high-efficiency, low-cost, and monolithic integration of THz LC devices. The fabricated phase shifter with a 450 μm-thick LC layer achieved a maximum phase modulation of 99.25° at 0.75 THz. Through indirect experimental testing, it exhibits quarter-wave-plate-like functionality in […]
- by Qin Zeng, Yu Qian, Ye Chen, Binbin Wang and Qinlong RenWith the rapid development of artificial intelligence technology, data centers have become essential for offering computational resources. However, data centers suffer from the challenge of overheating, with a large amount of wasted low-grade thermal energy. In addition, nanofluidic osmotic generators face the drawback of a relatively low power output. Hence, the present work proposes a three-stage coupled energy utilization scheme, leveraging the temperature-sensitive characteristics of nanofluidic osmotic generators via thermal management of a data center. A hybrid water–air cooling strategy […]
- by Diandian Zhang, Nirosh M Eldose, Dinesh Baral, Hryhorii Stanchu, Sudip Acharya, Fernando Maia de Oliveira, Mourad Benamara, Haochen Zhao, Yuping Zeng, Wei Du, Gregory J Salamo and Shui-Qing YuWe report on temperature and power dependent photoluminescence measurements that confirm the dominant direct bandgap nature of the germanium–tin (GeSn) films with about 11.4% Sn content grown on Ge buffered Si(100) substrate using molecular beam epitaxy (MBE). Structural characterizations via x-ray diffraction, secondary-ion mass spectrometry, atomic force microscopy, and transmission electron microscopy also confirm the absence of significant Sn segregation and point to a potential significant difference in relaxation and defect formation in MBE versus chemical vapor deposition growth of […]
- by Platon SolovevSpin wave propagation losses caused by magnetic damping have been studied for an isotropic thin film using phenomenological analysis and micromagnetic simulations. The losses were characterized by the decay length, which was calculated from the dispersion relation where the wave number was treated as a complex variable. A comparison with the exact numerical solution shows that a common approximate expression for the decay length, derived while considering dipolar-dominated waves and low damping typical for ferrimagnets, remains generally accurate even for […]
- by Bin Li, Yanpeng Zhang, Maoshu Yin, Xianglei Shi, Zhejun Guo, Mengmeng Lun, Min Sun, Yafei Zhang, Nantao Hu and Lijie SunWith the increasing demand for materials with superior electronic and thermal properties, there is a growing interest in developing composite nanofibers. Herein, electrospinning-derived carbon nanofibers loaded with Cu nanoparticles (CNF-Cu) for enhanced electronic and thermal diffusivity is demonstrated. Cu nanoparticles, carbon nanotubes (CNTs) and polyacrylonitrile (PAN) were used as raw materials to prepare CNF-Cu nanofibers. CNF-Cu with different Cu contents displayed excellent thermal and electrical conductivity due to the special positive crosslinking behaviors of nanofibers. The appropriate Cu nanoparticles were […]
- by Di Zhang, Minxia Shi, Haifeng Zhang, Jianzhi Yang, Zhihui Hong, Xinyi Yu and Shiqiang ZhengMagnetically shielded rooms (MSR) composed of high-permeability materials provided a near-zero magnetic environment for ultra-weak field measurements, such as biomagnetic cardiography and encephalography. To maximise material performance, a demagnetization current is applied to increase the effective permeability, thereby enhancing the shielding performance of the MSR. However, conventional open-loop demagnetization system is susceptible to disturbances that distort the current waveform and degrade the demagnetization effect. To improve disturbance suppression, this paper proposes a closed-loop demagnetization current control (DCC) strategy that integrates […]
- by Limin Wan, Xinqiang Pan, Xu Wang, Rene Heller, Frans Munnik, Lars Rebohle, Thomas Schumann, Ye Yuan, Yao Shuai, Wenbo Luo, Chuangui Wu, Jun Zhu, Shengqiang Zhou and Wanli ZhangWith the rapid development of LiTaO₃-on-insulator based applications, improving the ion slicing efficiency of single-crystal LiTaO₃ thin films is fundamental. In this work, flash-lamp annealing (FLA) with a pulse duration of 20 ms and energy densities between 10 and 60 J cm−2 was employed as a pre-treatment for hydrogen-ion-implanted single-crystal LiTaO₃. The FLA pretreatment significantly enhanced the blistering area and efficiency during subsequent conventional annealing by reducing the activation energy of the blistering process. Structural analyses using micro-Raman spectroscopy, Rutherford […]
- by Meng-Long Zhang, Xin-Li Sun, Lan-Yue Luo, Yao-Ting Wang, Zi-Ming Zhang, He-Ping Li, Dong-Jun Jiang and Ming-Sheng ZhouA control scheme to enhance the efficiency of the ion extraction process utilizing an externally applied weak magnetic field is proposed. Particle-in-cell simulations and experimental investigations based on an argon glow discharge show that the ion extraction time exhibits a ‘V-shaped’ non-monotonic distribution with the increase of the magnetic induction intensity. Under weaker magnetic fields, electron confinement and the formation of a localized ion density peak in the cathode sheath front constrain the ion extraction flux at the electrodes. In […]
- by Toshihiko Nagase, Hisanori Aikawa, Masatoshi Yoshikawa and Masahiko NakayamaMagnetic tunnel junctions (MTJs) have emerged as fundamental building blocks for advanced magnetic random access memory (MRAM) technology, leveraging the tunnel magnetoresistance (TMR) effect to distinguish the two magnetic states. The TMR effect, which arises at the interface between the two magnetic layers and the tunneling barrier layer, plays a critical role in the cell performance of MRAM. Careful material selection and interface quality control are key technological enablers that influence the TMR ratio and spin-transfer torque switching efficiency, thereby […]
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