Publications (32)
Fractional phase slips across the charge-density-wave domain walls in 1-T TiSe2
Haotian Zhang, Zihao Song, Zhongchen Xu +9
The microscopic origin of the charge density wave (CDW) in 1\textit{T}-TiSe remains controversial, with competing scenarios based on phonon-driven lattice instability and elect…
Phonon anomalies associated with spin reorientation in the Kagome ferromagnet Fe3Sn2
Ge He, Leander Peis, Ramona Stumberger +6
Polarization- and temperature-dependent Raman data along with theoretical simulations are presented for the Kagome ferromagnet Fe_3Sn_2. Eight out of nine expected phonon modes wer…
Flexible Parallel Neural Network Architecture Model for Early Prediction of Lithium Battery Life
Lidang Jiang, Zhuoxiang Li, Changyan Hu +2
The early prediction of battery life (EPBL) is vital for enhancing the efficiency and extending the lifespan of lithium batteries. Traditional models with fixed architectures often…
Anisotropic Electronic Correlations in the Spin Density Wave State of LaNiO
Ge He, Jun Shen, Shiyu Xie +21
The bilayer nickelate superconductor LaNiO undergoes a density wave transition near 150 K that has attracted intensive scrutiny, yet its microscopic origin remains elus…
Planning of Off-Grid Renewable Power to Ammonia Systems with Heterogeneous Flexibility: A Multistakeholder Equilibrium Perspective
Yangjun Zeng, Yiwei Qiu, Jie Zhu +5
Off-grid renewable power to ammonia (ReP2A) systems present a promising pathway toward carbon neutrality in both the energy and chemical industries. However, due to chemical safety…
Combinatorial Laser Molecular Beam Epitaxy System Integrated with Specialized Low-temperature Scanning Tunneling Microscopy
Ge He, Zhongxu Wei, Zhongpei Feng +6
We present a newly developed facility, comprised of a combinatorial laser molecular beam epitaxy system and an in-situ scanning tunneling microscopy (STM). This facility aims at ac…
Generating Comprehensive Lithium Battery Charging Data with Generative AI
Lidang Jiang, Changyan Hu, Sibei Ji +3
In optimizing performance and extending the lifespan of lithium batteries, accurate state prediction is pivotal. Traditional regression and classification methods have achieved som…
A disorder-sensitive emergent vortex phase identified in high-Tc superconductor (Li,Fe)OHFeSe
Dong Li, Peipei Shen, Jinpeng Tian +14
The magneto-transport properties are systematically measured under c-direction fields up to 33 T for a series of single-crystal films of intercalated iron-selenide superconductor (…
The effects of oxygen in spinel oxide Li1+xTi2-xO4-delta thin films
Yanli Jia, Ge He, Wei Hu +11
The evolution from superconducting LiTi2O4-delta to insulating Li4Ti5O12 thin films has been studied by precisely adjusting the oxygen pressure during the sample fabrication proces…
Polarized tip-enhanced Raman spectroscopy at liquid He temperature in ultrahigh vacuum using an off-axis parabolic mirror
Leander Peis, Ge He, Daniel Jost +2
Tip-enhanced Raman spectroscopy (TERS) combines inelastic light scattering well below the diffraction limit down to the nanometer range and scanning probe microscopy and, possibly,…
Emergent superconductivity in single crystalline films via structural engineering
Wei Hu, Zhongpei Feng, Ben-Chao Gong +15
Spinel compounds have demonstrated rich functionalities but rarely shown superconductivity. Here, we report the emergence of superconductivity in the spinel $\mathrm{MgTi}_2\mathrm…
Anisotropic electron-phonon coupling in the spinel oxide superconductor
Ge He, Yanli Jia, Xingyuan Hou +12
Among hundreds of spinel oxides, LiTi2O4 (LTO) is the only one that exhibits superconductivity (Tc ~13 K). Although the general electron-phonon coupling is still the main mechanism…
Anharmonic Strong-Coupling Effects at the Origin of the Charge Density Wave in CsVSb
Ge He, Leander Peis, Emma Frances Cuddy +8
The formation of charge density waves (CDW) is a long-standing open problem particularly in dimensions higher than one. Various observations in the vanadium antimonides discovered…
Raman Study of Cooper Pairing Instabilities in (LiFe)OHFeSe
Ge He, Dong Li, Daniel Jost +5
We studied the electronic Raman spectra of (LiFe)OHFeSe as a function of light polarization and temperature. In the B spectra alone we observe the redistribution…
Transport anomalies and quantum criticality in electron-doped cuprate superconductors
Xu Zhang, Heshan Yu, Ge He +4
Superconductivity research is like running a marathon. Three decades after the discovery of high-Tc cuprates, there have been mass data generated from transport measurements, which…
Contrasting Momentum-Selective Spin-Density-Wave Gaps in Bilayer and Trilayer Nickelates
Jun Shu, Jun Shen, Xiaoxiang Zhou +12
Resolving where the density-wave gap opens in momentum space is essential for identifying the microscopic origin of the instability in layered nickelates. Using polarization-resolv…
Tunable superconductivity in parent cuprate PrCuO thin films
Xinjian Wei, Ge He, Wei Hu +6
In this article, we studied the role of oxygen in PrCuO thin films fabricated by polymer assisted deposition method. The magnetoresistance and Hall resistivity of…
Crystallographic dependent transport properties and oxygen issue in superconducting LiTi2O4 thin films
Yanli Jia, Ge He, Heshan Yu +10
A systematic study is performed on the spinel oxide, i.e. LiTi2O4 thin films oriented along [111]-, [110]-, and [001]-directions, to reveal the crystallographic dependence of trans…
Anomalous magnetoresistance in the spinel superconductor LiTi2O4
Kui Jin, Ge He, Xiaohang Zhang +9
Transition-metal oxides offer an opportunity to explore unconventional superconductors, where the superconductivity (SC) is often interrelated with novel phenomena such as spin/cha…
Promoting superconductivity in FeSe films via fine manipulation of crystal lattice
Zhongpei Feng, Jie Yuan, Ge He +12
Stabilized FeSe thin films in ambient pressure with tunable superconductivity would be a promising candidate for superconducting electronic devices yet its superconducting transiti…
A conducting nano-filament (CNF) network as a precursor to the origin of superconductivity in electron-doped copper oxides
Heshan Yu, Ge He, Ziquan Lin +9
Emergency of superconductivity at the instabilities of antiferromagnetism has been widely recognized in unconventional superconductors. In copper-oxide superconductors, spin fluctu…
Reconfiguring flexibility in renewable power-to-ammonia systems using molten-salt thermal energy storage in the ammonia synthesis loop: A coordinated electro-hydrogen-thermal scheduling approach
Yiwei Qiu, Qingjie Sun, Yangjun Zeng +7
In renewable power-to-ammonia (ReP2A) systems, the intermittency of wind and solar generation propagates through electrolytic hydrogen production and induces thermal instability in…
Probing charge density wave phases and the Mott transition in -TaS by inelastic light scattering
S. ÄurÄiÄ Mijin, A. Baum, J. Bekaert +9
We present a polarization-resolved, high-resolution Raman scattering study of the three consecutive charge density wave (CDW) regimes in -TaS single crystals, supported by…
Ionic liquid gating induced two superconductor-insulator phase transitions in spinel oxide LiTiO
Zhongxu Wei, Qian Li, Ben-Chao Gong +13
The associations between emergent physical phenomena (e.g., superconductivity) and orbital, charge, and spin degrees of freedom of electrons are intriguing in transition metal…
Dynamic Modeling and Control of Multi-Stack Alkaline Water Electrolysis Systems with Shared Gas Separators and Lye Circulation:Industrial Data-Based Validation and Simulation
Yiwei Qiu, Jiatong Li, Yangjun Zeng +7
An emerging approach for large-scale renewable hydrogen production is integrating multiple alkaline water electrolysis (AWE) stacks into one balance-of-plant (BoP) system, sharing…
Anomalies of upper critical field in the spinel superconductor LiTiO
Zhongxu Wei, Ge He, Wei Hu +11
High-field electrical transport and point-contact tunneling spectroscopy were used to investigate superconducting properties of the unique spinel oxide, LiTiO films wi…
Non-Volatile Superconductivity in an Insulating Copper Oxide Induced via Ionic Liquid Gating
Xinjian Wei, Hao-bo Li, Qinghua Zhang +19
Manipulating the superconducting states of high-T_c cuprate superconductors in an efficient and reliable way is of great importance for their applications in next-generation electr…
Universal scaling of the critical temperature and the strange-metal scattering rate in unconventional superconductors
Jie Yuan, Qihong Chen, Kun Jiang +17
Dramatic evolution of properties with minute change in the doping level is a hallmark of the complex chemistry which governs cuprate superconductivity as manifested in the celebrat…
A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide
Heshan Yu, Ge He, Ziquan Lin +8
Emergency of superconductivity at the instabilities of antiferromagnetism (AFM), spin/charge density waves has been widely recognized in unconventional superconductors. In copper-o…
Quantum critical fluctuations in an Fe-based superconductor
Daniel Jost, Leander Peis, Ge He +9
Quantum critical fluctuations may prove to play an instrumental role in the formation of unconventional superconductivity. Here, we show that the characteristic scaling of a margin…
Magnetic field-tuned quantum criticality in optimally electron-doped cuprate thin films
Xu Zhang, Heshan Yu, Qihong Chen +14
Antiferromagnetic (AF) spin fluctuations are commonly believed to play a key role in electron pairing of cuprate superconductors. In electron-doped cuprates, it is still in paradox…
Normal State Gap in Parent Cuprate Pr2CuO4+/-δ
Ge He, Xinjian Wei, Xu Zhang +5
We present a tunneling study on single crystalline parent cuprate thin films, i.e. a series of Pr2CuO4+/-δ(PCO) with tunable superconducting transition temperature. The zero-bias…