Article
Chemistry, Physical
Yuehua Wei, Chuyun Deng, Xiaoming Zheng, Yangbo Chen, Xiangzhe Zhang, Wei Luo, Yi Zhang, Gang Peng, Jinxin Liu, Han Huang, Weiwei Cai, Qi Ge, Renyan Zhang, Xueao Zhang, Shiqiao Qin
Summary: This study investigates the thermal transport of supported WTe2 using Raman thermometry, finding different in-plane thermal conductivities along different directions. A heat manipulation model is proposed for WTe2 FET devices to effectively dissipate waste heat and prevent temperature discrepancy, providing new insights into thermal transport of anisotropic 2D materials.
Article
Chemistry, Multidisciplinary
Krastyo Buchkov, Rosen Todorov, Penka Terziyska, Marin Gospodinov, Velichka Strijkova, Dimitre Dimitrov, Vera Marinova
Summary: This paper reports the crystal growth conditions and optical anisotropy properties of Tungsten ditelluride (WTe2) single crystals synthesized using the chemical vapor transport (CVT) method. The high refractive index value and distinct tri-axial anisotropic behavior of the optical constants of WTe2 show practical potential for low-loss light modulation at the 2D nanoscale level.
Article
Physics, Multidisciplinary
Zhonghui Xu, Bing Luo, Yan Chen, Xiaobo Li, Zhen Chen, Qiuming Yuan, Xianbo Xiao
Summary: The photogalvanic effect (PGE) in the 2D T-d-WTe2 monolayer can generate significant photocurrent in the visible and near-infrared range under vertical linearly polarized light, showing a cosine dependence with respect to polarization angle. The photocurrent can be significantly enhanced at different bias voltages and directions, with the zigzag direction exhibiting larger photocurrent than the armchair direction. These results indicate the potential application of the 2D T-d-WTe2 monolayer in optoelectronics.
Article
Multidisciplinary Sciences
Zhongtao Lin, Wuguo Liu, Shibing Tian, Ke Zhu, Yuan Huang, Yang Yang
Summary: By using Raman spectroscopy, the thermal expansion coefficients of suspended MoS2 and supported MoS2 were investigated, showing significant differences. Additionally, negative thermal expansion coefficients were observed in MoS2 below 175K, which is attributed to bending vibrations in the layer during cooling. This study demonstrates that Raman spectroscopy is a useful tool in exploring the thermal properties of few-layer MoS2 for potential application in photoelectronic devices.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Yangbo Chen, Chuyun Deng, Yuehua Wei, Jinxin Liu, Yue Su, Siyi Xie, Weiwei Cai, Gang Peng, Han Huang, Mengyan Dai, Xiaoming Zheng, Xueao Zhang
Summary: The study investigates the thickness dependence of anisotropic in-plane Raman modes in supported few-layer WTe2 under different temperatures. It shows that as the thickness decreases, the anisotropic ratio increases. This finding provides guidance for regulating the anisotropy ratio in thermoelectrical and optoelectronic devices, potentially inspiring innovation in functional two-dimensional devices in the future.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
L. Y. Li, W. Wang, P. Z. Li, J. B. Xian, M. Zeng, M. F. Liu, Z. P. Hou, Z. Fan, D. Y. Chen, M. H. Qin, X. S. Gao, X. B. Lu, J. -M. Liu
Summary: The study revealed the unique spin-order-induced anisotropic ferroelectricity and magnetoelectric properties in Y-type hexaferrites. The intrinsic large anisotropy in the magnetodielectric and converse magnetoelectric effects was demonstrated, with spin-driven electric polarizations closely related to different spin structures in the material. This suggests significant potential for applications in multiferroic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Analytical
Cai-Feng Shi, Bo Zheng, Jian Li, Yue Zhou, Hai-Ling Liu, Saud Asif Ahmed, Kang Wang, Xing-Hua Xia
Summary: The study introduces an ultrabroadband plasmonic metamaterial absorber that can absorb 99% of incident light energy and excite plasmon resonance from ultraviolet to near-infrared range, enabling efficient plasmon-enhanced Raman scattering. The absorber exhibits high PERS performance with a detection limit of down to 10^(-12) M and excellent uniformity and reproducibility under various excitation sources, suggesting potential for cost-effective high-throughput production.
ANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Aref Rasoulzadeh Zali, Steven Kleijn, Luc Augustin, Netsanet M. Tessema, Kristif Prifti, Ripalta Stabile, Nicola Calabretta
Summary: In this work, a low polarization-dependent SOA co-integrated with passive waveguides is designed, simulated, fabricated and characterized, showing potential applications in photonic integrated circuits. The simulation results are in good agreement with the experimental results, validating the feasibility of the design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Condensed Matter
Igor Antoniazzi, Natalia Zawadzka, Magdalena Grzeszczyk, Tomasz Wozniak, Jordi Ibanez, Zahir Muhammad, Weisheng Zhao, Maciej R. Molas, Adam Babinski
Summary: The temperature dependence of Raman scattering (RS) in bulk hafnium disulfide (HfS2) is investigated, revealing unexpected energy shifts of the main Raman-active modes at different temperatures, as well as the emergence of a new mode. The optical anisotropy of RS in HfS2 is highly dependent on the excitation energy, and the presence of iodine molecules intercalated in the van der Waals gaps between HfS2 layers is also analyzed for possible effects. The results are discussed in the context of resonant light-phonon interactions.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Applied
Albert Mathew, Vijith K. K. Pulikodan, Manoj A. G. Namboothiry
Summary: This study explores topological effects in a Weyl semimetal and develops self-powered photodetectors at room temperature. The observed photocurrent is attributed to a combined effect of photothermoelectric effect and bulk photovoltaic phenomenon, which converts light into electrical current as a non-linear optical effect.
APPLIED PHYSICS LETTERS
(2022)
Article
Spectroscopy
Vijay Laxmi, Nilanjan Basu, Pramoda K. Nayak
Summary: The thermal conductivity of WTe2 is studied over different substrates, and the out-of-plane thermal conductivity is estimated using micro-Raman spectroscopy. The results show that the choice of substrate significantly affects the thermal conductivity, and the thickness of WTe2 also impacts its thermal conductivity.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Pingping Zhuang, Jing Liu, Junjie Huang, Chao Dou, Weiwei Cai, Weiyi Lin
Summary: This study investigates the charge distribution between layers in van der Waals stacked crystals using carbon isotope-labeled few-layer graphene. The electrical transfer characteristics of graphene field-effect transistors are used to calibrate the correspondence between Fermi level and G-phonon frequency. The results reveal that the charge concentration in both top and bottom layers of few-layer graphene is close and does not follow the exponential decay law. Additionally, each additional layer of graphene reduces the charge exchange at the graphene/dopant interface. These findings have important implications for electronic applications based on two-dimensional materials and provide a framework for further exploring the properties of other two-dimensional systems.
Article
Chemistry, Multidisciplinary
Faridul Islam, Arash Tahmasebi, Behdad Moghtaderi, Jianglong Yu
Summary: This study focused on synthesizing few-layer graphene (FLG) from bituminous coal through a catalytic process under microwave heat treatment. The research indicated that the catalyst percentages affected the structural change of FLG composite materials, and the catalyst loaded samples showed homogeneous distribution and indicated few-layer graphene sheets.
Article
Chemistry, Physical
Xianpin Zhao, Zifan Yang, Junqing Guo, Xuying Zhong, Wei Dou, Yanling Yin, Yuehua Peng, Ruosheng Zeng, Weichang Zhou, Dongsheng Tang, Yangbo Zhou
Summary: This study systematically explored the phonon modes of Ta2NiSe7 thin flakes and demonstrated their distinct in-plane lattice vibration dynamics and anisotropic electron-phonon interactions, which can be used to detect crystallographic orientation and polarization properties. The crystallographic orientation of Ta2NiSe7 thin flakes can be determined by polarized Raman spectroscopy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Elizabeth Drueke, Junjie Yang, Liuyan Zhao
Summary: Researchers studied two nonlinear optical effects in type-II Weyl semimetal T-d-WTe2, quantifying these effects through techniques such as polarization resolution and rotational anisotropy. They found that these effects exhibit strong anisotropy and are influenced by the polarization direction of the light used.
Article
Multidisciplinary Sciences
Xiao Wei, Xi Kang, Zewen Zuo, Fengqi Song, Shuxin Wang, Manzhou Zhu
Summary: The hierarchical self-assembly of atomically precise nanoclusters with different arrays was achieved by controlling the adsorbed molecules on the cluster surface. This work demonstrates the selective construction of micrometric linear chains (1D array), grid networks (2D array), and superstructures (3D array) of nanoclusters through the hierarchical self-assembly of Ag-29(SSR)(12) nano-building blocks conjoined with different solvent molecules.
NATIONAL SCIENCE REVIEW
(2021)
Article
Physics, Applied
Hangkai Xie, Dinghui Wang, Zixiu Cai, Bo Chen, Jingwen Guo, Muhammad Naveed, Shuai Zhang, Minhao Zhang, Xuefeng Wang, Fucong Fei, Haijun Zhang, Fengqi Song
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Juan Jiang, Sangjae Lee, Fucong Fei, Fengqi Song, Lio Vescovo, Konstantine Kaznatcheev, Frederick J. Walker, Charles H. Ahn
Article
Chemistry, Multidisciplinary
Asteriona-Maria Netsou, Dmitry A. Muzychenko, Heleen Dausy, Taishi Chen, Fengqi Song, Koen Schouteden, Margriet J. Van Bael, Chris Van Haesendonck
Article
Nanoscience & Nanotechnology
Faji Xie, Zhen Lian, Shuai Zhang, Tianmeng Wang, Shengnan Miao, Zhiyong Song, Zhe Ying, Xing-Chen Pan, Mingsheng Long, Minhao Zhang, Fucong Fei, Weida Hu, Geliang Yu, Fengqi Song, Ting-Ting Kang, Su-Fei Shi
Summary: This study demonstrates a significant photocurrent response from field-effect transistor devices based on intrinsic topological insulators, showing sensitivity to initial Fermi energy of the surface state and controllable erasure through gate voltage manipulation. The remote photo-doping mechanism is proposed to explain the observations, in which light excites defects in the bulk to release carriers to the surface state. This photodoping modulates the surface state conductivity without compromising mobility, and alters the quantum Hall effect.
Article
Physics, Multidisciplinary
Ya Bai, Fucong Fei, Shuo Wang, Na Li, Xiaolu Li, Fengqi Song, Ruxin Li, Zhizhan Xu, Peng Liu
Summary: Three-dimensional topological insulators host unique spin-polarized surface states with no energy gap, exhibiting unconventional charge and spin transport properties. High harmonic generation from the intrinsic topological insulator BiSbTeSe2 reveals that even-order harmonics polarized along the pump polarization stem from the spin current in helical surface states, while perpendicular components originate from out-of-plane spin polarization related to hexagonal wrapping effect.
Article
Multidisciplinary Sciences
Siqi Lu, Lin Xie, Kang Lai, Runkun Chen, Lu Cao, Kuojuei Hu, Xuefeng Wang, Jinsen Han, Xiangang Wan, Jianguo Wan, Qing Dai, Fengqi Song, Jiaqing He, Jiayu Dai, Jianing Chen, Zhenlin Wang, Guanghou Wang
Summary: The plasmonic response of gold clusters was studied with changing atom numbers, showing different behaviors in bulk plasmon and surface plasmon as the atom number decreases. The excitation ratio of surface plasmon was found to follow a specific power-law relationship, indicating a precise evolution of plasmon physics with varying atom numbers.
NATIONAL SCIENCE REVIEW
(2021)
Article
Chemistry, Multidisciplinary
Huang Xu, Fucong Fei, Zhiqingzi Chen, Xiangyan Bo, Zhe Sun, Xiangang Wan, Li Han, Lin Wang, Kaixuan Zhang, Jiazhen Zhang, Gang Chen, Changlong Liu, Wanlong Guo, Luhan Yang, Dacheng Wei, Fengqi Song, Xiaoshuang Chen, Wei Lu
Summary: This study achieved a type-II Dirac semimetal Ir1-xPtxTe2 with a protected crystal structure and tunable Fermi level through Pt doping, showing excellent performance at terahertz frequencies. Van der Waals integration with Dirac semimetals exhibited superb detector performance comparable to state-of-the-art detectors.
Article
Physics, Applied
Bin Jia, Shuai Zhang, Zhe Ying, Hangkai Xie, Bo Chen, Muhammad Naveed, Fucong Fei, Minhao Zhang, Danfeng Pan, Fengqi Song
Summary: Researchers fabricated MnBi4Te7 thin film devices and observed unconventional anomalous Hall effect, characterized by hysteresis anomaly and hump-like behavior, as well as interesting gate-controlled sign reversal. They suggest that the effect may be due to the coexistence of antiferromagnetic and ferromagnetic components resulting from inhomogeneous spatial variation, providing valuable insights into the material family study.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Peng Mao, Changxu Liu, Yubiao Niu, Yuyuan Qin, Fengqi Song, Min Han, Richard E. Palmer, Stefan A. Maier, Shuang Zhang
Summary: Materials exhibit diverse responses to incident light based on their unique dielectric functions, with the optical response in nanotechnology being influenced by both material properties and geometric structures. The advancement of nanotechnology has led to significant progress in optical structures with feature sizes smaller than the optical wavelength, resulting in flourishing developments in plasmonics and photonic crystals. A counterintuitive system consisting of plasmonic nanostructures composed of different materials but exhibiting almost identical reflection has been proposed, highlighting the insensitivity of the optical response to different plasmonic materials.
ADVANCED MATERIALS
(2021)
Article
Physics, Applied
Hangkai Xie, Fucong Fei, Fenzhen Fang, Bo Chen, Jingwen Guo, Yu Du, Wuyi Qi, Yufan Pei, Tianqi Wang, Muhammad Naveed, Shuai Zhang, Minhao Zhang, Xuefeng Wang, Fengqi Song
Summary: This study demonstrates that a Sb substitutional dopant in MnBi6Te10 plays a dual role by adjusting charge carrier type and concentration, and inducing the solid into a ferromagnetic (FM) ground state. An intrinsic FM-MTI candidate is shown in the phase diagram of Mn(Sb (x) Bi1-x )(6)Te-10, with the AFM ground state region close to the charge-neutral point.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Zhili Yin, Xingzi Fang, Ziyang Liu, Yan Gao, Ziqing Wang, Haifeng Wang, Zhong Wei
Summary: This study investigates the potential of employing graphenylene-based triple-atom catalysts for the nitrogen reduction reaction, focusing on performance, configuration optimization, thermal stability, catalyst selectivity, activity, and interaction mechanism.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhe Ying, Shuai Zhang, Bo Chen, Bin Jia, Fucong Fei, Minhao Zhang, Haijun Zhang, Xuefeng Wang, Fengqi Song
Summary: In this study, we investigate the dissipationless transport properties of chiral edge state (CES) in the Chern insulator MnBi2Te4 devices. We observe a near-zero longitudinal resistance and a quantized Hall plateau similar to 0.97h/e(2) up to 22 K. The CES shows different temperature dependencies, with well-preserved dissipationless transport below 6 K, variable range hopping from 6 to 22 K, and thermal activation above 22 K. We also find that a current of over 1.4 mu A at 2 K can break the dissipationless transport. Additionally, a p-n junction has almost no influence on the CES of the Chern insulator MnBi2Te4.
Proceedings Paper
Engineering, Electrical & Electronic
Changxu Liu, Peng Mao, Yubiao Niu, Yuyuan Qin, Fengqi Song, Min Han, Richard E. Palmer, Shuang Zhang, Stefan A. Maier
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Materials Science, Multidisciplinary
Bo Chen, Dinghui Wang, Zhicheng Jiang, Bo Zhang, Shengtao Cui, Jingwen Guo, Hangkai Xie, Yong Zhang, Muhammad Naveed, Yu Du, Xuefeng Wang, Haijun Zhang, Fucong Fei, Dawei Shen, Zhe Sun, Fengqi Song
Summary: This study presents an intrinsic ferromagnetic topological insulator (MTI) sample Mn(Bi0.7Sb0.3)4Te-7, which exhibits coexisting ferromagnetic behavior state and topological nontriviality. By engineering charge carriers through Sb substitution in the MnBi4Te7 matrix with antiferromagnetic ordering, significant modulation of magnetism is achieved, showing potential applications of MTIs. The clear demonstration of the intrinsic FM-MTI of Mn(Bi0.7Sb0.3)4Te-7 in this paper paves the way for further material optimization and studies on topology, magnetism, and charge carriers in topological materials.