Article
Chemistry, Physical
Lucia Perez Ramirez, Anthony Boucly, Florent Saudrais, Fabrice Bournel, Jean-Jacques Gallet, Emmanuel Maisonhaute, Aleksandar R. Milosavljevic, Christophe Nicolas, Francois Rochet
Summary: X-ray photoemission spectroscopy with liquid microjet setups is crucial for understanding key electrochemical and photocatalytic processes in aqueous solutions. Properly defining energy levels is necessary for determining vertical ionization energies and binding energies, with the vacuum level and Fermi level uniquely determined through the rising edge of secondary electrons and introduction of redox couples.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
J. S. Zhou, R. Z. Xu, X. Q. Yu, F. J. Cheng, W. X. Zhao, X. Du, S. Z. Wang, Q. Q. Zhang, X. Gu, S. M. He, Y. D. Li, M. Q. Ren, X. C. Ma, Q. K. Xue, Y. L. Chen, C. L. Song, L. X. Yang
Summary: In this study, the electronic structures of superconducting K3C60 thin films were systematically investigated using high-resolution angle-resolved photoemission spectroscopy. A dispersive energy band crossing the Fermi level, Jahn-Teller active phonon modes, and strong electron-phonon coupling were observed. The electron-phonon coupling constant was estimated to be approximately 1.2, and an isotropic nodeless superconducting gap was observed. These results provide important insights into the mechanism of unusual superconductivity in fulleride compounds.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Seungho Seong, Heejung Kim, Kyoo Kim, B. Min, Y. S. Kwon, Sang Wook Han, Byeong-Gyu Park, R. Stania, Yeonji Seo, J-S Kang
Summary: The study reveals that the CDW formation in ErTe3 is not directly contributed by Er 4 f electrons, but rather by band folding due to interlayer interaction. The observation of a twofold symmetric shadow Fermi surface in the CDW phase of ErTe3 indicates weak CDW-induced Fermi surface reconstruction. The very weak CDW reconstruction in ErTe3 is likely due to the small ionic sizes of Er ions and the reduced density of states at the Fermi level.
Article
Materials Science, Multidisciplinary
Hiroaki Anzai, Atsushi Hariki, Hitoshi Sato, Masashi Arita, Tao Zhuang, Koichi Hiraoka
Summary: In this study, angle-resolved photoemission spectroscopy measurements and local density approximation calculations were used to reveal the temperature-dependent Fermi surface evolution in YbInCu4. The topology of the Fermi surface was experimentally identified, showing an increase in the surface area with decreasing temperature. Theoretical analysis revealed the dramatic change in the band structure near the Fermi level due to c-f hybridization, causing the Van Hove singularity to move to the Fermi level. This study provides important evidence for the first-order valence transition of YbInCu4.
Article
Physics, Multidisciplinary
Shuaishuai Li, Taimin Miao, Chaohui Yin, Yinghao Li, Hongtao Yan, Yiwen Chen, Bo Liang, Hao Chen, Wenpei Zhu, Shenjin Zhang, Zhimin Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Chengtian Lin, Hanqing Mao, Guodong Liu, Zuyan Xu, Lin Zhao, X. J. Zhou
Summary: In this study, spatially-resolved laser-based high-resolution angle resolved photoemission spectroscopy (ARPES) measurements were performed on the optimally-doped YBa2Cu3O7-delta (Y123) superconductor. For the first time, clear bulk electronic properties were observed in the region from the cleaved surface. The Fermi surface and band structures of Y123 were determined, and a nodeless superconducting gap consistent with the d+is gap form was identified.
Article
Physics, Multidisciplinary
Yu Matsuzawa, Tomohiro Morita, Masashi Arita, Alessio Giampietri, Viktor Kandyba, Alexey Barinov, Akira Takahashi, Yusuke Nagakubo, Tadashi Adachi, Yoji Koike, Atsushi Fujimori, Naurang L. Saini, Takashi Mizokawa
Summary: The study investigated the electronic structure of protect annealed Pr1.3-xLa0.7CexCuO4 (x = 0.05) using ARPES and SPEM, revealing the system's dominance by antiferromagnetic and nonsuperconducting state. The results showed an inhomogeneous electronic structure with a minority state less electron doped than the majority state under a Ce concentration of x = 0.05.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Physics, Multidisciplinary
Sang-Jun Choi, Bjoern Trauzettel
Summary: A deep theoretical understanding of the electrical response of Josephson junctions is crucial for recent discoveries of new types of superconductivity and technological advances in superconducting quantum computers. This study focuses on the microscopic theory of the dc current-biased I-V characteristics of Josephson tunnel junctions, deriving an analytical formula and identifying subharmonics and their underlying mechanism. By applying the theory to the Werthamer equation, various dc current-biased I-V characteristics are described as a function of superconducting gap softening. The study also reveals the presence of voltage staircases in genuine Josephson junctions without ac current bias or qubit dynamics. This general analytical approach offers new insights into the microscopic understanding of I-V characteristics of Josephson junctions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Liudmila L. Larina, Oleksii Omelianovych, Van-Duong Dao, Kyunglim Pyo, Dongil Lee, Ho-Suk Choi
Summary: This study quantifies energy band alignments at a nanostructured TiO2/Au-22(SG)(18) cluster interface using X-ray photoelectron spectroscopy, finding evidence of a finite optical energy gap in Au clusters and determining the pinning position of the Fermi energy level at the interface. The results provide insights for improving the efficiency of metal-cluster-sensitized solar cells and increasing the open-circuit voltage by proper modifications based on the energy levels detected.
Article
Chemistry, Physical
Guorui Xiao, Siqi Wu, Baizhuo Li, Bin Liu, Jifeng Wu, Yanwei Cui, Qinqing Zhu, Guang-han Cao, Zhi Ren
Summary: ThIr2 is a weak coupling type-II superconductor with a fully isotropic superconducting gap. Electronic correlation is suggested to be important in ThIr2 based on its specific heat coefficient, upper critical field, Ginzburg-Laudau parameter, Wilson ratio, and Kadowaki-Woods ratio. The valence band states in ThIr2 are dominated by Ir-5d orbitals, with significant hybridizations with Ir-6p, Th-6d, and 7p orbitals at the Fermi level.
Article
Physics, Multidisciplinary
Christopher Broyles, David Graf, Haitao Yang, Xiaoli Dong, Hongjun Gao, Sheng Ran
Summary: This study found that the complex structural distortion of CsV3Sb5 has a significant impact on the Fermi surface properties, and provided strong evidence for interlayer ordering.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Mei-Ling Lu, Yao Wang, He-Zhi Zhang, Hao-Lin Chen, Tian-Yuan Cui, Xi Luo
Summary: By applying an external in-plane magnetic field, we observe the appearance of a topological nodal superconducting phase in the two-dimensional topological surface states. This phase is protected by chiral symmetry in the presence of a non-zero magnetic field, and exhibits Majorana Fermi arcs connecting the Majorana nodes along the edges, similar to Weyl semimetals. The topological nodal superconductor is an intermediate phase between two different chiral superconductors and remains stable against substrate effects. The two-dimensional effective theory of this phase also describes the low energy behavior of a three-dimensional lattice model of an iron-based superconductor with a thin film geometry. Manipulating the localization of Majorana nodes through external in-plane magnetic fields may introduce a non-trivial topological Berry phase between them.
Article
Chemistry, Physical
Yujie Chen, Juan Jiang, Haifeng Yang, Pavel Dudin, Alexey Barinov, Zhongkai Liu, Haihu Wen, Lexian Yang, Yulin Chen
Summary: The Type-II iron-based superconductors exhibit unique properties such as high Neel temperature and phase separation. This study focuses on the electronic structure of superconducting KxFe2-ySe2, revealing clear electronic phase separation into metallic islands and insulating matrix with different K and Fe concentrations. The results provide insights into the composition and electronic structures of phase-separated superconducting and insulating phases of KxFe2-ySe2, shedding light on the unique physics in Type-II Fe-SCs.
Article
Chemistry, Physical
A. S. Tarasov, D. V. Ishchenko, I. O. Akhundov, V. A. Golyashov, A. E. Klimov, S. P. Suprun, E. V. Fedosenko, V. N. Sherstyakova, A. G. Rybkin, O. Yu. Vilkov, O. E. Tereshchenko
Summary: This study investigated the effects of surface treatment on Pb1-xSnxTe In In (1 1 1) surface in HCl-isopropanol solution, revealing the removal of native oxides and surface enrichment by elemental tellurium, as well as subsequent desorption of tellurium and restoration of (1x1) surface structure. Angle resolved photoemission spectroscopy (ARPES) measurements on MBE-grown films of Pb1-xSnxTe showed Dirac-like dispersion surface states at Gamma. Dark current and photocurrent were observed depending on surface chemical procedure and composition, pointing towards potential applications in TCI research.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Marcel Holtmann, Peter Krueger, Koji Miyamoto, Taichi Okuda, Kenya Shimada, Markus Donath
Summary: The surface electronic structure of Re(0001) was investigated using experimental and theoretical methods. Spin-and angle-resolved photoemission were employed to study the spin-dependent energy dispersion of electronic states. Band-structure calculations based on density-functional theory were compared with the experimental results. Additional calculations were performed to consider transitions into final states. It was found that Rashba-type spin splittings were observed and there was no out-of-plane spin polarization due to the monatomic steps on the real Re(0001) surface.
Article
Physics, Applied
D. L. Fang, J. S. Liu, Y. K. Cui
Summary: Theoretical study on the vortex image near a vortex core in the presence of anisotropic superconducting gap or anisotropic Fermi surface was conducted. The results show anisotropic vortex core with fourfold symmetry, but with different detailed structures. Differences were observed in the behaviors of local density of states (LDOS) along curvature minima/maxima and superconducting gap maxima/minima at short and larger distances. The evolution of vortex images in these two situations also behave quite differently as energy increases.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Naifang Liu, Zhihui Chen, Wenxuan Fan, Jie Su, Tingting Lin, Si Xiao, Jianqiao Meng, Jun He, Jagadese J. Vittal, Jianzhuang Jiang
Summary: A series of luminescent frameworks were synthesized by selectively combining AIE-linker H4TCPE and Zn2+. These complexes exhibit highly efficient multiphoton excited photoluminescence and third harmonic generation. The multiphoton absorption parameters of complex 1 are superior to other materials and the incorporation of pillar linkers greatly influences the multiphoton absorption performance of the frameworks.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Physics, Multidisciplinary
Xiao-Fang Tang, Shuang-Xing Zhu, Hao Liu, Chen Zhang, Qi-Yi Wu, Zi-Teng Liu, Jiao-Jiao Song, Xiao Guo, Yong-Song Wang, He Ma, Yin-Zou Zhao, Fan-Ying Wu, Shu-Yu Liu, Kai-Hui Liu, Ya-Hua Yuan, Han Huang, Jun He, Wen Xu, Hai-Yun Liu, Yu-Xia Duan, Jian-Qiao Meng
Summary: High-quality large 1T phase of TiX (2) (X = Te, Se, and S) single crystals were grown by chemical vapor transport method using iodine as a transport agent. Raman spectroscopy analysis revealed several phonon modes, including both commonly reported and rarely reported modes, as well as unexpected phonon changes that may be related to charge density wave phase transition. These findings contribute to the understanding of the charge density wave and superconductivity in TiX (2) materials.
Article
Physics, Multidisciplinary
Chen Zhang, Qi-Yi Wu, Wen-Shan Hong, Hao Liu, Shuang-Xing Zhu, Jiao-Jiao Song, Yin-Zou Zhao, Fan-Ying Wu, Zi-Teng Liu, Shu-Yu Liu, Ya-Hua Yuan, Han Huang, Jun He, Shiliang Li, Hai-Yun Liu, Yu-Xia Duan, Hui-Qian Luo, Jian-Qiao Meng
Summary: We used ultrafast optical spectroscopy to study the nonequilibrium quasiparticle relaxation dynamics of the iron-based superconductor KCa2Fe4As4F2 with Tc = 33.5 K. The findings revealed a possible pseudogap below T* (approximately 50 K) before the opening of a superconducting gap. Measurements under high pump fluence also showed the presence of two distinct, coherent phonon oscillations. The research suggests that the pseudogap is likely a precursor to superconductivity, and the electron-phonon coupling may play a critical role in the superconducting pairing in KCa2Fe4As4F2.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Materials Science, Multidisciplinary
Wenxuan Fan, Jun He, Hao Wei, Chen Zhang, Menglong Zhu, Defeng Xu, Si Xiao, Jiangling He, Zhihui Chen, Jianqiao Meng
Summary: In this study, a new type of red fluorescent carbon dot (RCD) was successfully synthesized and systematically characterized for its nonlinear optical (NLO) properties. The RCDs exhibited broadband NLO responses, including saturable absorption and two-photon absorption in the near-infrared region. The RCDs were applied for imaging Hela cells, indicating their potential use in deep-tissue imaging.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Mansour M. AL-Makeen, Xiao Guo, Yongsong Wang, Dingbang Yang, Siwen You, Madoune Yassine, Junjie Jiang, Peng-Bo Song, You-Guo Shi, Haipeng Xie, Jian-Qiao Meng, Han Huang
Summary: The study determines the e-ph coupling constants in PdTe2 nanoflakes using temperature-dependent Raman spectroscopy, finding that PdTe2 is a phonon-mediated superconductor.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Genetics & Heredity
Junhong Du, Qianqian Zhang, Sijia Hou, Jing Chen, Jianqiao Meng, Cong Wang, Dan Liang, Rongling Wu, Yunqian Guo
Summary: In this study, we conducted a genome-wide analysis to investigate the TcMYB gene family in Theobroma cacao. The results revealed that TcMYB genes have multiple functions, including responding to environmental stress.
Article
Physics, Multidisciplinary
Shaofeng Duan, Wei Xia, Chaozhi Huang, Shichong Wang, Lingxiao Gu, Haoran Liu, Dao Xiang, Dong Qian, Yanfeng Guo, Wentao Zhang
Summary: The ultrafast electronic structures of 1T-TiSe2, a charge density wave material, were studied using high-resolution time- and angle-resolved photoemission spectroscopy. The study found that the populations of quasiparticles drove ultrafast electronic phase transitions in 1T-TiSe2 within 100 fs after photoexcitation. A metastable metallic state, different from the equilibrium normal phase, was observed below the charge density wave transition temperature. The photoinduced metastable metallic state resulted from the coherent electron-phonon coupling process, where the motion of atoms was halted, and its lifetime was prolonged with increasing pump fluence.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Zi-Teng Liu, Chen Zhang, Qi-Yi Wu, Hao Liu, Bo Chen, Zhi-Bo Yin, Sheng-Tao Cui, Zhe Sun, Shuang-Xing Zhu, Jiao-Jiao Song, Yin-Zou Zhao, Hong-Yi Zhang, Xue-Qing Ye, Fan-Ying Wu, Shu-Yu Liu, Xiao-Fang Tang, Ya-Hua Yuan, Yun-Peng Wang, Jun He, Hai-Yun Liu, Yu-Xia Duan, Jian-Qiao Meng
Summary: The recently discovered ternary chalcogenide superconductor Bi2Rh3Se2 has gained attention for studying the interplay between charge density wave (CDW) order and superconductivity. The nature of its phase transition around 240 K, whether it is due to the formation of CDW, has been controversial. In this study, the electronic structure of Bi2Rh3Se2 was investigated using angle-resolved photoemission spectroscopy, and it was found that the phase transition at 240 K is a second-order CDW transition. The results provide insights into the CDW order and superconductivity in Bi2Rh3Se2.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Multidisciplinary
Fan-Ying Wu, Qi-Yi Wu, Chen Zhang, Yang Luo, Xiangqi Liu, Yuan-Feng Xu, Dong-Hui Lu, Makoto Hashimoto, Hao Liu, Yin-Zou Zhao, Jiao-Jiao Song, Ya-Hua Yuan, Hai-Yun Liu, Jun He, Yu-Xia Duan, Yan-Feng Guo, Jian-Qiao Meng
Summary: The three-dimensional electronic structure and the nature of Ce 4f electrons of the Kondo insulator CeRu4Sn6 are studied using angle-resolved photoemission spectroscopy with tunable photon energies. The findings include the three-dimensional k-space nature of the Fermi surface, the localized-to-itinerant transition of f electrons occurring at a much higher temperature than the hybridization gap opening temperature, and the relocalization of itinerant f-electrons below 25 K, which could be the precursor to the establishment of magnetic order.
FRONTIERS OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yongsong Wang, Bo Chen, Zi-Teng Liu, Xiao Guo, Siwen You, Zihan Wang, Haipeng Xie, Tianchao Niu, Jian-Qiao Meng, Han Huang
Summary: The ternary chalcogenide superconductor Bi2Rh3Se2 was found to have CDW order and EPC, and the phase transition at -240 K is still debated. Raman scattering investigations on single-crystal Bi2Rh3Se2 reveal the anisotropic EPC and inhibiting Raman intensity. X-ray diffraction and Raman measurements indicate the existence of ICCDW and CCDW CDW orders below -250 and -170 K, respectively, and the appearance of zone-folded phonon modes confirms the CCDW-induced 2 x 2 reconstruction of the Brillouin zone. Semiquantitative analysis based on Landau theory reflects extensive coupling between the phonons and CDW orders, confirming the critical role of EPC in CDW transitions in Bi2Rh3Se2.
Article
Materials Science, Multidisciplinary
Chen Zhang, Ya-Hua Yuan, Jiao-Jiao Song, Jan Rusz, Yin-Zou Zhao, Qi-Yi Wu, Yu-Xia Duan, Yasmine Sassa, Oscar Tjernberg, Martin Mansson, Magnus H. Berntsen, P. H. Tobash, Eric D. Bauer, Peter M. Oppeneer, Tomasz Durakiewicz, Jian-Qiao Meng
Summary: We investigated the electronic structure of the antiferromagnetic Kondo lattice CePd5Al2 and found that it is dominated by the Pd 4d band character, with multiple hole and electron Fermi pockets in good agreement with theoretical calculations. Our results suggest that Fermi surface nesting drives the formation of antiferromagnetic order in CePd5Al2.
Article
Materials Science, Multidisciplinary
Yin-Zou Zhao, Qi-Yi Wu, Chen Zhang, Bo Chen, Wei Xia, Jiao-Jiao Song, Ya-Hua Yuan, Hao Liu, Fan-Ying Wu, Xue-Qing Ye, Hong-Yi Zhang, Han Huang, Hai-Yun Liu, Yu-Xia Duan, Yan-Feng Guo, Jun He, Jian-Qiao Meng
Summary: Ultrafast optical spectroscopy was used to investigate the ultrafast quasiparticle dynamics of antiferromagnetic Kondo lattice CeAuSb2 as a function of temperature and fluence. Our results reveal the behavior of quasiparticles at different temperatures and light intensities, including the opening of a hybridization gap, the coupling of coherent phonon modes with Kondo effect and magnetic orders, and a possible photoinduced nonthermal phase transition. These observations shed light on the hybridization dynamics and magnetic orders in heavy fermion systems.
Article
Materials Science, Multidisciplinary
Chen Zhang, Qi-Yi Wu, Ya-Hua Yuan, Xin Zhang, Hao Liu, Zi-Teng Liu, Hong-Yi Zhang, Jiao-Jiao Song, Yin-Zou Zhao, Fan-Ying Wu, Shu-Yu Liu, Bo Chen, Xue-Qing Ye, Sheng-Tao Cui, Zhe Sun, Xiao-Fang Tang, Jun He, Hai-Yun Liu, Yu-Xia Duan, Yan-Feng Guo, Jian-Qiao Meng
Summary: This study investigates the CDW modulation vector, momentum, and temperature dependence of CDW gaps in EuTe4 using angle-resolved photoemission spectroscopy. The results show that a FS nesting vector q approximately 0.67b* drives the formation of the CDW state in EuTe4, resulting in a large anisotropic CDW gap that exists in the whole FS and remains considerable even at high temperatures. The CDW gap also exhibits abnormal behavior in magnitude as a function of temperature, and an extra, larger gap opens at higher binding energy due to the interaction between different orbits of the main bands.
Review
Materials Science, Multidisciplinary
Zehua Hu, Xue Liu, Pedro Ludwig Hernandez-Martinez, Shishu Zhang, Peng Gu, Wei Du, Weigao Xu, Hilmi Volkan Demir, Haiyun Liu, Qihua Xiong
Summary: Van der Waals heterojunctions, fabricated by stacking two-dimensional materials, have shown great potential in photonics, optoelectronics, and information sciences. This review focuses on the charge and energy transfer processes in transition metal dichalcogenides (TMDCs) and other related 2D materials, and highlights the applications and future development challenges in this field.
