Article
Multidisciplinary Sciences
Hyun-Tak Kim
Summary: Room-temperature superconductivity in hydrides measured under high pressure can be theoretically explained by combining the generalized BCS T-c and the diverging effective mass in the Brinkman-Rice (BR)-Bardeen-Cooper-Schrieffer (BCS) model. The transition from the on-site Coulomb interaction in a correlated metal to the interaction in the superconducting state can lead to superconductivity induced by volume contraction caused by high pressure or low temperature.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Yuan Li, He Ma, Yu Wang, Jun Ding, Limei Qi, Yulan Fu, Ran Ning, Lu Rong, Dayong Wang, Xinping Zhang
Summary: With the growing need for broadband wireless communication, high-resolution radar, security inspection, and biological analysis, terahertz (THz) technology has made significant progress in recent years. This progress has been possible due to the development of various THz functional devices, with metasurface being widely applied in these devices. However, constructing flexible THz metasurface devices remains a challenge due to the lack of flexibility in traditional semiconductor and metal materials. In this study, a two-dimensional material called MXene was used to create flexible metasurfaces with frequency filtering and polarization functions. These metasurfaces, combined with vanadium dioxide, showed excellent amplitude modulation performance under electrical stimulation. The flexibility and high integration of this active metasurface make it useful in THz imaging and sensing systems.
APPLIED PHYSICS LETTERS
(2022)
Article
Polymer Science
Jian Li, Zhihong Liang, Kaijuan Chen, Xu Zhang, Guozheng Kang, Qianhua Kan
Summary: Experimental investigations on the mechanical deformations of thermo-induced shape memory polymers at different strain rates reveal the influence of loading history conditions on the glass transition temperature and shape memory effect. Temperature hysteresis is observed in stress freezing and strain recovery stages due to varied temperature rate. A logarithmic rate-based viscoelastic-viscoplastic model is established to simulate the rate-dependent mechanical deformation and shape memory effect, which is validated by comparing with experimental results.
Article
Chemistry, Physical
Jiaming Chen, Peng Suo, Wenjie Zhang, Hong Ma, Jibo Fu, Di Li, Xian Lin, Xiaona Yan, Weimin Liu, Zuanming Jin, Guo-Hong Ma, Jianquan Yao
Summary: In this study, transient terahertz spectroscopy was employed to investigate the nonequilibrium carrier dynamics and its temperature dependence in MoTe2. The experimental result demonstrated for the first time the dynamic formation of small polarons in a MoTe2 Weyl semimetal, which is of fundamental importance for understanding the optically driven enhancement of electron-phonon coupling, temperature-induced quantum phase transition, and the design of a MoTe2-based far-infrared photodetector.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Jian Zhou, Haowei Xu, Yongliang Shi, Ju Li
Summary: This study demonstrates how terahertz light can drive ultrafast topological phase transitions in monolayer TMDs by modulating the Gibbs free energy landscape under light. The reversible phase transitions between different stable phases with small energy barriers enable applications in high-resolution fast data storage and in-memory computing.
Article
Chemistry, Multidisciplinary
Jing Peng, Yuhua Liu, Haifeng Lv, Yuxuan Li, Yue Lin, Yueqi Su, Jiajing Wu, Hongfei Liu, Yuqiao Guo, Zhiwen Zhuo, Xiaojun Wu, Changzheng Wu, Yi Xie
Summary: Exfoliation of AgCrS2 into nanosheets was achieved by intercalation with tetraalkylammonium cations, leading to superionic behavior at room temperature.
Article
Multidisciplinary Sciences
Yong Zhao, Baoshuang Shang, Bo Zhang, Xing Tong, Haibo Ke, Haiyang Bai, Wei-Hua Wang
Summary: This study demonstrates that a Ce-based metallic glass can transform into a hyperstable state and exhibit strong resistance against crystallization after long-term aging. The achieved hyperstable state is similar to that of million-year-aged amber, and the Ce-based metallic glass can reach equilibrium liquid state below T-g without crystallization.
Article
Chemistry, Multidisciplinary
Lanyu Zhao, Wenzhuo Wu, Bo Gao, Zhiliang Zhao, Bin An, Qun Xu
Summary: This article successfully obtained ultrathin two-dimensional non-van der Waals gamma-Ga2O3 with room temperature ferromagnetism using supercritical CO2. The stress effect of supercritical CO2 selectively modulates the orientation and strength of covalent bonds, leading to changes in the atomic structure of the material and the transition to ferromagnetic behavior.
Article
Materials Science, Multidisciplinary
Ze Yu, Tao Bo, Bo Liu, Zhendong Fu, Huan Wang, Sheng Xu, Tianlong Xia, Shiliang Li, Sheng Meng, Miao Liu
Summary: In this paper, we demonstrate a data-driven approach to discover MgB2-like superconductors and their related compounds. Through experimental synthesis and measurements, we confirm their superconducting properties. This study highlights the feasibility of material discovery through data analysis.
Article
Physics, Multidisciplinary
Bing Cheng, Patrick L. Kramer, Zhi-Xun Shen, Matthias C. Hoffmann
Summary: Light-induced ferroelectricity is a new approach to dynamically stabilize hidden orders in quantum ferroelectric materials. By intense terahertz excitation of the soft mode, we investigate the possibility of driving a transient ferroelectric phase in KTaO3 and observe a long-lived relaxation up to 20ps.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Wenyue Zhao, Ze Li, Zhao Wang, Yazhou Peng, Lei Shi, Wenjing Hua, Jie Wang, Lidong Wang, Wei-Dong Fei, Yu Zhao
Summary: In this study, large and regulable electrocaloric effects at room temperature are achieved in PbZrO3/Ca3Mn2O7 bilayer films based on PbZrO3 phase transition, and the sign of adiabatic temperature change, ΔT, is determined by Ca3Mn2O7 thickness. The formed PbZrO3-Ca3Mn2O7 heterojunction reduces the carrier concentration of the film and establishes a built-in electric field, greatly enhancing the withstanding voltage of the bilayer films. A maximum positive ΔT of 66.5 K is obtained in the bilayer film with a thin Ca3Mn2O7 layer, while a negative ΔT of -9.9 K is obtained with a thick Ca3Mn2O7 layer, both near room temperature. This work presents a simple and effective approach to designing huge electrocaloric effects based on antiferroelectric-containing multilayers near room temperature.
Article
Multidisciplinary Sciences
Maximilian Frenzel, Marie Cherasse, Joanna M. Urban, Feifan Wang, Bo Xiang, Leona Nest, Lucas Huber, Luca Perfetti, Martin Wolf, Tobias Kampfrath, X. -y. Zhu, Sebastian F. Maehrlein
Summary: We use intense THz electric fields to directly control the lattice of hybrid CH3NH3PbBr3 and all-inorganic CsPbBr3 perovskites by nonlinear excitation of octahedral twist modes. Raman-active phonons in the range of 0.9 to 1.3 THz are found to dominate the phonon-modulated polarizability, leading to the ultrafast THz-induced Kerr effect and potential implications for dynamic charge carrier screening beyond the Frohlich polaron. Our work opens up the possibility of selectively controlling the vibrational degrees of freedom in LHPs, which can influence phase transitions and dynamic disorder.
Article
Physics, Nuclear
Heng Tang, Lingrong Zhao, Pengfei Zhu, Xiao Zou, Jia Qi, Ya Cheng, Jiaqi Qiu, Xianggang Hu, Wei Song, Dao Xiang, Jie Zhang
Summary: The study demonstrates a miniaccelerator powered by terahertz pulses, achieving precise and sustained acceleration while being stable and scalable.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2021)
Article
Materials Science, Ceramics
Shafique Ahmed, Man Zhang, Vladimir Koval, Lifong Zou, Zhijian Shen, Riqing Chen, Bin Yang, Haixue Yan
Summary: ZrO2-based ceramics are commonly used in biomedical applications for their color, biocompatibility, and excellent mechanical properties. The study on LTD in 3Y-TZP ceramic powders revealed a tetragonal-to-monoclinic phase transition driven by degradation. Terahertz nondestructive probe shows promise as a method to investigate LTD in zirconia ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Multidisciplinary Sciences
Qinxi Qiu, Wanli Ma, Jingbo Li, Lin Jiang, Wangchen Mao, Xuehui Lu, Niangjuan Yao, Yi Shi, Zhiming Huang
Summary: In this study, a room temperature THz photodetector utilizing the electromagnetic induced well mechanism with an SOI-based structure was reported. The detector achieved high sensitivity, fast response, and low noise equivalent power, paving the way for the realization of Si-based THz focal plane arrays with wide applications.
Article
Education, Scientific Disciplines
Jason Anderson, Catherine Gillen, Jacqueline Wright, Charles S. Adams, Ifan G. Hughes
AMERICAN JOURNAL OF PHYSICS
(2020)
Article
Optics
Charles Moehl, Nicholas L. R. Spong, Yuechun Jiao, Chloe So, Teodora Ilieva, Matthias Weidemueller, Charles S. Adams
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Paolo P. Mazza, Richard Schmidt, Igor Lesanovsky
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
G. Buonaiuto, I Lesanovsky, B. Olmos
Summary: In this theoretical investigation, we studied the feedback control of a laser-driven one-dimensional atomic chain interfaced with a nanofiber. By measuring guided light through photon counting or homodyne detection, the system's statistics can be controlled. The feedback scheme allows enhancement of photon counting rate and fluctuations, and alteration of the many-body state of the atom chain, providing insights on dynamics in light-matter networks with experimental setups.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Education, Scientific Disciplines
James L. Maxwell, Ifan G. Hughes, Charles S. Adams
Summary: Researchers used two methods to measure the wavelength dependence of the Verdet constant of a terbium gallium garnet crystal, and found that although the white-light measurement method only requires one source, it is more prone to systematic errors than using multiple laser sources.
EUROPEAN JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Florian Christaller, Max Maeusezahl, Felix Moumtsilis, Annika Belz, Harald Kuebler, Hadiseh Alaeian, Charles S. Adams, Robert Loew, Tilman Pfau
Summary: We investigate the generation of high atomic densities using light-induced atomic desorption in a vapor cell. By pulsing an intense off-resonant laser on a sapphire-coated cell, we observe the desorption of atomic clouds from the internal surfaces. Time-resolved absorption spectroscopy reveals the evolution of atomic density, showing broadening and line shift of the atomic resonances, which are attributed to dipole-dipole interactions. These findings highlight the potential of fast switching of atomic density and dipolar interactions for future quantum devices based on excitation blockade.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Dong-Sheng Ding, Zong-Kai Liu, Bao-Sen Shi, Guang-Can Guo, Klaus Molmer, Charles S. Adams
Summary: This research demonstrates the enhanced sensitivity of many-body critical systems to small variations in external parameters in a non-equilibrium Rydberg atomic gas. By quantifying the Fisher information, it is shown that many-body effects lead to a three orders of magnitude increase in sensitivity compared to single-particle systems.
Article
Physics, Multidisciplinary
Alexander Guttridge, Daniel K. Ruttley, Archie C. Baldock, Rosario Gonzalez-Ferez, H. R. Sadeghpour, C. S. Adams, Simon L. Cornish
Summary: We demonstrate Rydberg blockade between a single Rb atom and a single RbCs molecule confined in optical tweezers due to charge-dipole interaction. The molecule is efficiently transferred to the rovibrational ground state and the separation between the atom and molecule is controlled using species-specific tweezers. Excitation dynamics are observed to be consistent with simulated interaction potentials, opening up possibilities for transferring quantum information between individually trapped molecules using Rydberg atoms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Atomic, Molecular & Chemical
Naomy Duarte Gomes, Barbara da Fonseca Magnani, Jorge Douglas Massayuki Kondo, Luis Gustavo Marcassa
Summary: In this study, polarization spectroscopy was used to investigate electromagnetically induced transparency in a vapor cell with a hot Rb-85 Rydberg state using a Laguerre-Gaussian mode beam. The results showed that the transition linewidth for a Laguerre-Gaussian mode control beam was narrower than for a Gaussian mode, and could be well reproduced by a simplified Lindblad master equation model.
Article
Materials Science, Multidisciplinary
Joshua P. Rogers, Liam A. P. Gallagher, Danielle Pizzey, Jon D. Pritchett, Charles S. Adams, Matthew P. A. Jones, Chris Hodges, Wolfgang Langbein, Stephen A. Lynch
Summary: In this study, even-parity Rydberg exciton states in cuprous oxide were investigated using second harmonic generation (SHG) spectroscopy. The coherently generated second harmonic was successfully isolated from lower-lying free and bound excitonic states, and the quantum defects of the S and D excitonic states associated with crystal symmetries were determined. Odd-parity P and F excitonic states were also observed. The SHG spectrum was found to be cut off at a lower principal quantum number compared to conventional one-photon spectroscopy measurements.
Article
Physics, Multidisciplinary
A. Skljarow, H. Kuebler, C. S. Adams, T. Pfau, R. Loew, H. Alaeian
Summary: Strong light-induced interactions between atoms are crucial for quantum information processing. In a dielectric environment, the scattering and light-induced dipolar interaction of atoms can be enhanced. By combining the high densities achievable in thermal atomic vapors with efficient coupling to a slot waveguide, researchers have achieved controlled and enhanced atom interactions. The experimental results are in agreement with simulations, paving the way for robust and scalable quantum nonlinear optics and all-optical quantum information processing at room temperature.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Liam A. P. Gallagher, Joshua P. Rogers, Jon D. Pritchett, Rajan A. Mistry, Danielle Pizzey, Charles S. Adams, Matthew P. A. Jones, Peter Grunwald, Valentin Walther, Chris Hodges, Wolfgang Langbein, Stephen A. Lynch
Summary: Exciton-mediated coupling between microwave and optical fields has been observed in cuprous oxide at low temperatures. Rydberg excitonic states with different principal quantum numbers were observed using one-photon and two-photon spectroscopy. The absorption line shape and coherent second harmonic were found to be significantly affected by the addition of a microwave field near resonance with an excitonic state. The results are in agreement with a model based on intraband electric dipole transitions between Rydberg exciton states.
PHYSICAL REVIEW RESEARCH
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Shuying Chen, Dominic Reed, Lucy A. Downes, Andrew R. MacKellar, Nourah F. Almuhawish, Matthew J. Jamieson, Charles S. Adams, Kevin J. Weatherill
Summary: The Rydberg EIT and AT splitting in an atomic vapor cell can be used as novel methods for electric-magnetic field detection. By observing a linear trend between THz field amplitude and the frequency splitting of the absorption dips and EIT transmission peaks induced by the THz radiation, the Rydberg atomic measurement system can be a practical tool for THz field detection.
2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)
(2021)
Article
Optics
B. Olmos, C. Liedl, I Lesanovsky, P. Schneeweiss
Summary: The research investigates light scattering from an array of atoms into the guided modes of a waveguide, finding an enhanced scattering phenomenon and a modified Bragg condition. Different parameter regimes are identified for the scattering rate dependence on the atom number, and the findings are shown to be independent of the asymmetry of the atom-light coupling.
Article
Optics
Sofia Ribeiro, Thomas F. Cutler, Charles S. Adams, Simon A. Gardiner
Summary: The study investigates the collective scattering of coherent light from thermal alkali-metal vapor and develops a theoretical model to describe this phenomenon. The model, treating the atomic ensemble as radiating dipoles, shows good qualitative agreement with experimental results and suggests the possibility of exploring different photon statistics regimes through fine-tuning of experimental parameters.