Article
Multidisciplinary Sciences
Hongyun Zhang, Changhua Bao, Michael Schuler, Shaohua Zhou, Qian Li, Laipeng Luo, Wei Yao, Zhong Wang, Thomas P. Devereaux, Shuyun Zhou
Summary: In this study, high resolution TrARPES measurements were used to investigate Kekule-ordered graphene. By resolving the self-energy effect and its dynamic changes, the study reveals the role of specific phonon modes in the ultrafast relaxation dynamics of graphene.
NATIONAL SCIENCE REVIEW
(2022)
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
Multidisciplinary Sciences
Shaohua Zhou, Changhua Bao, Benshu Fan, Hui Zhou, Qixuan Gao, Haoyuan Zhong, Tianyun Lin, Hang Liu, Pu Yu, Peizhe Tang, Sheng Meng, Wenhui Duan, Shuyun Zhou
Summary: Time-periodic light field has been used to manipulate quantum states in solid-state materials, cold atoms, and photonic systems. This is achieved through interaction with photon-dressed Floquet states in the strong-coupling limit, known as Floquet engineering. In this study, experimental evidence of momentum-resolved Floquet band engineering in a model semiconductor, black phosphorus, is reported using time and angle-resolved photoemission spectroscopy measurements. Strong band renormalization and light-induced dynamical gap opening are observed near the band edges under near-resonance pumping, along with the emergence of Floquet sidebands. The band renormalization shows a selection rule favoring pump polarization along the armchair direction, indicating pseudospin selectivity for Floquet band engineering enforced by lattice symmetry. This work demonstrates pseudospin-selective Floquet band engineering in black phosphorus and provides important guiding principles for Floquet engineering of semiconductors.
Article
Multidisciplinary Sciences
Ke Zhang, Guo Chen, Shaohua Zhou, Zi Yuan, Xu Gu, Duanliang Zhou, Yuan Wang, Xinyu Gao, Yucheng Ma, Runzhe Xu, Zaiqiao Bai, Peng Liu, Lexian Yang, Shuyun Zhou, Shoushan Fan, Kaili Jiang
Summary: In this article, the concepts of optical blackbody and electron blackbody are introduced, which have significant implications for the study of quantum mechanics. Vertically aligned carbon nanotube arrays are used as an example of electron blackbodies, which can achieve ideal electron absorption and emission at different temperatures. This concept can also be extended to blackbodies for extreme ultraviolet, X-ray, and gamma-ray photons, as well as neutrons, protons, and other elementary particles.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Haoyuan Zhong, Hongyun Zhang, Haoxiong Zhang, Ting Bao, Kenan Zhang, Shengnan Xu, Laipeng Luo, Awabaikeli Rousuli, Wei Yao, Jonathan D. Denlinger, Yaobo Huang, Yang Wu, Yong Xu, Wenhui Duan, Shuyun Zhou
Summary: We report the superconducting and electronic structure properties of a natural van der Waals superlattice (PbSe)(1.14)NbSe2. Anisotropic superconductivity with a higher transition temperature than monolayer NbSe2 is revealed by transport measurements. ARPES measurements reveal the two-dimensional electronic structure and charge transfer characteristics. Our study suggests that natural van der Waals superlattices can achieve intriguing properties distinct from bulk and monolayer samples.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Runfa Feng, Wei Wang, Changhua Bao, Zichun Zhang, Fei Wang, Hongyun Zhang, Junjie Yao, Yong Xu, Pu Yu, Shuai-Hua Ji, Chen Si, Shuyun Zhou
Summary: This study reports the selective growth of monolayer TaTe2 films with different phases and superstructures by controlling the growth temperature and post-growth annealing treatment. The different electronic structures of 1H-TaTe2 and 1T-TaTe2 films are revealed through experimental measurements and theoretical calculations. The transition from a root 19x root 19 superstructure to a new 2 x 2 superstructure is observed in the annealed 1H-TaTe2 film.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Fei Wang, Yang Zhang, Zhijie Wang, Haoxiong Zhang, Xi Wu, Changhua Bao, Jia Li, Pu Yu, Shuyun Zhou
Summary: In this study, the authors demonstrate a self-intercalation method driven by ionic liquid gating to obtain high-quality PdTe and NiTe single crystals from PdTe2 and NiTe2, respectively. This synthesis pathway for transition metal monochalcogenides provides new opportunities for exploring their unique properties, such as emergent superconductivity.
NATURE COMMUNICATIONS
(2023)
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)
