Article
Physics, Multidisciplinary
Ming-jian Shi, Zhen Lei, Ya-yan Xi, Xue-qin Cao, Hui-biao Liu, Yuan-yuan Huang, Xin-long Xu
Summary: In this study, polarized terahertz (THz) wave generation is achieved using a bilayer metamaterial consisting of T-shaped structure and split resonator rings. The ellipticity and orientation angle of the THz polarization ellipse can be modulated by adjusting the twist angle between the layers.
ANNALEN DER PHYSIK
(2023)
Article
Chemistry, Physical
Xinyu Huang, Wen Zhao, Chongyang Zhu, Xianjue Chen, Xu Han, Jie Xing, Lihong Bao, Lei Meng, Norman N. Shi, Peng Gao, Lei Liu, Xingjiang Zhou, Feng Xu, Feng Ding, Yuan Huang
Summary: This work presents a highly efficient fast-cooling method to create wrinkle networks in layered materials, indicating that wrinkles significantly impact the chemical reactivity and the new wrinkle engineering method can tune the physical and chemical properties of multilayer graphene.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Weifeng Zhang, He Hao, Yangjin Lee, Yan Zhao, Lianming Tong, Kwanpyo Kim, Nan Liu
Summary: This study successfully fabricated multilayer Moire superlattices with only one twisted interface and systematically studied their twist-angle dependent optical properties. The results showed that the twisted multilayers exhibited higher photoluminescence intensity and tunable interlayer coupling, indirect bandgap, and degree of circular polarization.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Jinglan Liu, Chunhua Zhu, Zilong Zhang, Qiancheng Ren, Xuewei Zhang, Yang Zhang, Yanhan Jin, Wei Qiu, Hongtao Wang, Junhua Zhao, Pei Zhao
Summary: This study investigates the interfacial shear coupling (ISC) of layered 2D van der Waals (vdW) materials using bilayer graphene (BLG) and isotope-labeled Raman spectroscopy. The results reveal an inverse proportionality between the interfacial shear strength and the sample size, with the ISC undergoing bonding, sliding, and debonding processes under uniaxial tensile strain. Molecular dynamics simulations attribute this inverse proportionality to the stronger interlayer vdW interaction induced by the edge lattices and atoms of BLG. These findings provide fundamental insights into the macroscopic interfacial shear properties of 2D vdW stacks and have potential applications in guiding the design of graphene-based composite materials and flexible 2D electronics.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Lin Yang, Lei Jin, Lena Wysocki, Joerg Schoepf, Daniel Jansen, Brajagopal Das, Lior Kornblum, Paul H. M. Van Loosdrecht, Ionela Lindfors-Vrejoiu
Summary: Magnetic interlayer coupling is crucial for designing multifunctional magnetic multilayers, and the specific characteristics of interlayer coupling in certain materials can be influenced by external factors, especially the presence of non-magnetic spacer layers. In experiments, it was found that increasing the thickness of the LaNiO3 spacer layer may lead to changes in the strength of magnetic coupling.
Article
Chemistry, Physical
Xian Wang, Mingli Yang
Summary: The interaction at the interface of two layers in twist bilayer graphene and its quantum dots varies with twist angle, with charge transfer interaction dominating the variation. This understanding of the interlayer interaction nature can lead to new approaches of optoelectronic modulation of graphene-based materials.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xuyao Xiong, Congcong Ning, Yan Jin, Dongling Li, Qian Yang, Xiangnan Gong, Chao Cheng, Qingjiang Pan, Yi Xu, Baoshan Hu
Summary: This research proposes a new strategy to regulate the synthesis of graphene ribbons and successfully synthesizes pure and N-doped graphene ribbon arrays. By studying the interlayer coupling interaction of graphene ribbons and N-doped graphene ribbons, novel Raman scattering modes are discovered.
Article
Physics, Multidisciplinary
Liu Yang, Shiping Ding, Jinhua Gao, Menghao Wu
Summary: In this study, it is demonstrated through first-principles that graphene with more than three layers can exhibit ferroelectric behavior, where the polarization stems from symmetry breaking in interlayer stacking configurations. The polarization states can be switched by interlayer sliding, and varied polarizations emerge in more layers. The moire pattern in some multilayer graphene systems possess nonzero net polarizations and can be electrically reversed upon interlayer sliding.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Sihang Liu, Liangbo Xu, Zhefan Yuan, Mei Huang, Tian Yang, Shengfu Chen
Summary: The design of a spatial structure for three-dimensional crosslinked units is important for improving the mechanical properties of hydrogels. In this study, a pressure-responsive crosslinker called mGOa was developed, which achieved both low elastic modulus and high compression stress through interlayer sliding. The hydrogel crosslinked by mGOa showed significantly enhanced mechanical strength compared to other crosslinkers.
Article
Thermodynamics
Yan Chen, Jing Wan, Yang Chen, Huasong Qin, Yilun Liu, Qing-Xiang Pei, Yong-Wei Zhang
Summary: The interlayer thermal resistance (ITR) in multilayer graphene can be effectively controlled by in-plane defects and crosslinks. In-plane defects enhance phonon scattering and increase the ITR, while crosslinks provide a fast phonon transmission pathway and decrease the ITR.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Physics, Applied
Yongheng Zhang, Xuedong Xie, Junyu Zong, Wang Chen, Fan Yu, Qichao Tian, Qinghao Meng, Can Wang, Yi Zhang
Summary: Investigation of interfacial charge transfer between different layers of graphene and WSe2 revealed that monolayer graphene transferred more electrons to WSe2 compared to bilayer and trilayer graphene. This information is important for understanding charge transfer behaviors in 2D stacking-heterostructures and for the design of future nano-devices based on 2D materials.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Takumi Funato, Mamoru Matsuo
Summary: In this study, we have identified a new mechanism for generating spin currents and helicity currents in Rashba systems by dynamically distorting the lattice with surface acoustic waves. These findings provide an alternative functionality of conventional Rashba systems in the field of spintronics.
Article
Multidisciplinary Sciences
Yang Lu, Yingying Zhang, Chi-Yuan Yang, Sergio Revuelta, Haoyuan Qi, Chuanhui Huang, Wenlong Jin, Zichao Li, Victor Vega-Mayoral, Yannan Liu, Xing Huang, Darius Pohl, Miroslav Polozij, Shengqiang Zhou, Enrique Canovas, Thomas Heine, Simone Fabiano, Xinliang Feng, Renhao Dong
Summary: In this study, the authors report a strategy to tune interlayer charge transport and thermoelectric properties by controlling the layer spacing via side-chain induction. By functionalizing hexaiminotriindole ligands with tailored alkyl chains, they were able to precisely vary the layer spacing in 2D conjugated metal-organic frameworks (2D c-MOFs) and achieve widened band gap, suppressed carrier mobilities, and improved Seebeck coefficient. The researchers also achieved a record-high thermoelectric power factor in a specific sample.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Shuai Xu, Jiesu Wang, Pan Chen, Kuijuan Jin, Cheng Ma, Shiyao Wu, Erjia Guo, Chen Ge, Can Wang, Xiulai Xu, Hongbao Yao, Jingyi Wang, Donggang Xie, Xinyan Wang, Kai Chang, Xuedong Bai, Guozhen Yang
Summary: This paper investigates the magneto-electric coupling in freestanding BiFeO3 using optical second harmonic generation combined with varying magnetic field and temperature. The authors find that the coupling is suppressed by strain releasing but remains robust against thermal fluctuations. Magneto-electric coupling, with the potential to enhance device functionality and reduce energy consumption, has been challenging to probe in unstable and fragile freestanding membranes or two-dimensional materials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yunxi Qi, Can Yao, Jun Zhao, Hui Zeng
Summary: Based on first-principles calculations, it is demonstrated that the spin valley coupling and valley splitting properties of Mo/WSi2P4 monolayers can be modulated using the two-dimensional ferromagnetic CrI3 semiconductor via the magnetic proximity effect. The CrI3/MoSi2P4 (CrI3/WSi2P4) heterostructures are found to be thermally stable and exhibit type-II band alignment at room temperature, making them promising for optoelectronic devices.
Article
Physics, Applied
Wei Lu, Xiaoming Song, Jiwei Ling, Zipu Fan, Junchao Ma, Xiao Zhuo, Jing Liu, Xiaodong Hu, Faxian Xiu, Dong Sun
Summary: The study reveals that through the interaction of light with materials, the thermal-mechanical effect induced by light can be used to quantify the thermal and mechanical properties of elastic materials. This approach offers a novel avenue for characterizing the thermal and mechanical properties of materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Nooshin M. Estakhri, Theodore B. Norris
Summary: The ability of phase-change materials to rapidly switch between two stable phases has led to their incorporation in metasurfaces for controlling optical fields. These structures enable the control of nonclassical two-photon quantum interference, with high switching speeds and no static power consumption. The development of compact and rapidly controllable quantum devices is opening up new possibilities in quantum applications and improving quantum logic gates and other systems.
Article
Chemistry, Multidisciplinary
Changhua Bao, Qian Li, Sheng Xu, Shaohua Zhou, Xiang-Yu Zeng, Haoyuan Zhong, Qixuan Gao, Laipeng Luo, Dong Sun, Tian-Long Xia, Shuyun Zhou
Summary: This study reveals the ultrafast dynamics of Dirac fermions in a 3D Dirac semimetal, showing their cooling mechanism and population inversion phenomenon. The linear dependence of relaxation rate on energy suggests cooling through intraband relaxation, and the observation of accumulated photoexcited carriers in the conduction band indicates population inversion with a relatively long lifetime compared to 2D graphene.
Article
Chemistry, Multidisciplinary
Jiawei Lai, Junchao Ma, Zipu Fan, Xiaoming Song, Peng Yu, Zheng Liu, Pei Zhang, Yi Shi, Jinluo Cheng, Dong Sun
Summary: This study presents a photodetector based on a type-II Weyl semimetal that can directly detect the orbital angular momentum (OAM) of light, extending the capability to the mid-infrared band. The design utilizes peculiar electrode geometries and the orbital photogalvanic effect (OPGE) to achieve the direct detection of OAM. The results show that the helical phase gradient of light can be distinguished by a current winding around the optical beam axis, enabling on-chip-integrated OAM detection in the mid-infrared region.
ADVANCED MATERIALS
(2022)
Article
Optics
Zhengyu Huang, Jeffrey A. Fessler, Theodore B. Norris
Summary: This research proposes the use of a focal stack camera as a novel secure imaging device for localizing modified regions in manipulated images. The results show that applying convolutional neural network detection methods to focal stack images achieves significantly better detection accuracy.
Article
Multidisciplinary Sciences
Wei Lu, Zipu Fan, Yunkun Yang, Junchao Ma, Jiawei Lai, Xiaoming Song, Xiao Zhuo, Zhaoran Xu, Jing Liu, Xiaodong Hu, Shuyun Zhou, Faxian Xiu, Jinluo Cheng, Dong Sun
Summary: This study reveals the transient photothermoelectric response of Dirac semimetallic Cd3As2, namely the photo-Seebeck effect and photo-Nernst effect, by studying the terahertz emission from the transient photocurrent induced by these effects. The response clearly indicates an order of magnitude enhancement on transient photothermoelectric current generation when a weak magnetic field is applied. These results highlight the enhancement of thermoelectric performance can be achieved in topological Dirac semimetals based on the Nernst effect.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Zhaohang Xue, Zipu Fan, Xin Liao, Yaolong Li, Yulu Qin, Guanyu Zhang, Xiaoming Song, Zhi-Min Liao, Dong Sun, Guowei Lu, Qihuang Gong
Summary: The artificial engineering of photoresponse is crucial for optoelectronic applications, and in this study, a metasurface on a semimetallic Cd3As2 nanoplate was designed and fabricated to improve its thermoelectric photoresponse. The metasurface enhanced light absorption and resulted in a temperature gradient, contributing to the thermoelectric photoresponse. The power-dependent and wavelength-dependent measurements confirmed the excellent photoresponse characteristics of the metasurface device, including a linearly dependent photoresponse and efficient separation of photoexcited carriers. The designed metasurface device also demonstrated an anisotropic polarization-dependent photoresponse. This study highlights the potential of metasurfaces in controlling the photoresponse of semimetallic materials.
Article
Multidisciplinary Sciences
Junchao Ma, Bin Cheng, Lin Li, Zipu Fan, Haimen Mu, Jiawei Lai, Xiaoming Song, Dehong Yang, Jinluo Cheng, Zhengfei Wang, Changgan Zeng, Dong Sun
Summary: The study reveals the band structures and semiconductor band gaps related to Weyl physics in tellurium, opening up new possibilities for exploring and utilizing chirality-related Weyl physics. Experimental results show that circular photogalvanic effect has opposite signs at different wavelengths, providing evidence of tellurium's Weyl-related optical response. These findings have important implications for the development of helicity-sensitive optoelectronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Dehui Zhang, Zhen Xu, Gong Cheng, Zhe Liu, Audrey Rose Gutierrez, Wenzhe Zang, Theodore B. Norris, Zhaohui Zhong
Summary: In this study, the authors propose a new hybrid photoconductive switch design by engineering a hot-carrier fast lane using graphene on silicon. This design allows for a high-speed photoconductive switch without sacrificing the generated power.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Xin Liao, Chang Xu, Zi-Pu Fan, Ying-Ying Lan, Na Li, Chun-Guang Chu, An-Qi Wang, Dong Sun, Zhi-Min Liao
Summary: The combination of 2D Dirac semimetal graphene and 3D counterpart Cd3As2 in Dirac heterostructures can overcome the weak optical absorption in graphene-based devices and the dark current in pure Cd3As2 photodetectors, leading to high-performance photodetectors with broadband detection, high sensitivity, and rapid response.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Yuanpeng Wu, Ping Wang, Woncheol Lee, Anthony Aiello, Parag Deotare, Theodore Norris, Pallab Bhattacharya, Mackillo Kira, Emmanouil Kioupakis, Zetian Mi
Summary: Both 2D TMDs and III-V semiconductors are potential platforms for quantum technology, but each with its limitations. 2D TMDs have a large exciton binding energy and customizable quantum properties, but compatibility issues with existing industrial processes. On the other hand, III-nitrides have been widely used in light-emitting devices and power electronics but lack exploitation of excitonic quantum aspects. Recent advancements in 2D III-nitrides have shown promise in achieving room-temperature quantum technologies.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Yucai Lin, Shuxia Chen, Chang Xu, Zipu Fan, Tingting Zou, Dong Sun, Jianjun Yang
Summary: This study demonstrates a femtosecond laser treatment strategy that can enhance the quality of bismuth films by reducing surface roughness and eliminating grain boundaries. As a result, the photoresponsivity of the bismuth films increases approximately 2 times within an ultra-broad spectrum range from the visible to mid-infrared.
Editorial Material
Optics
Xiaomu Wang, Dong Sun
Summary: Weyl semimetals are emerging topological materials with intriguing physical properties, which may lead to novel photonic and optoelectronic applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Zhengyu Huang, Jeffrey A. Fessler, Theodore B. Norris
Summary: In this study, the impact of various camera parameters, including aperture size, sensor resolution, and number of sensor planes, on the depth estimation accuracy of focal stack cameras based on transparent sensors was investigated. The deep learning based depth estimation performance was analyzed and compared between focal stack cameras and light field cameras, providing guidelines for future focal stack camera design.
Review
Physics, Applied
Changhua Bao, Peizhe Tang, Dong Sun, Shuyun Zhou
Summary: The interaction between light and 2D and topological materials serves as a fascinating control knob for inducing emergent properties and achieving new functionalities in ultrafast timescales, from femtoseconds to picoseconds. Recent experimental progress on light-induced phenomena, such as Bloch-Floquet states and photo-induced phase transitions, has been discussed, with perspectives on the opportunities of proposed light-induced phenomena and open experimental challenges also provided.
NATURE REVIEWS PHYSICS
(2022)
