Article
Chemistry, Physical
Chenjing Quan, Xiao Xing, Tingyuan Jia, Zeyu Zhang, Chunwei Wang, Sihao Huang, Zhengzheng Liu, Juan Du, Yuxin Leng
Summary: The charge transfer process in two-dimensional graphene/transition metal dichalcogenides heterostructures was investigated. The study revealed the correlation between the hot phonon bottleneck effect in graphene and the charge transfer process. The existence of interlayer charge transfer in the heterostructure and its dependence on pump fluence were confirmed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Chenjing Quan, Xiao Xing, Tingyuan Jia, Zeyu Zhang, Chunwei Wang, Sihao Huang, Zhengzheng Liu, Juan Du, Yuxin Leng
Summary: In this study, the hot carrier transport in graphene/transition metal dichalcogenides heterostructures was investigated using optical pump and terahertz probe spectroscopy. The results revealed the relationship between charge transfer and pump fluence, providing insights into the mechanism for further exploration of optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau, Sankar Das Sarma
Summary: Observing two distinct superconducting phases in ABC-stacked trilayer graphene, we investigate electron-acoustic-phonon coupling as a possible pairing mechanism and predict the existence of superconductivity with the highest Tc near the Van Hove singularity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Zherui Han, Xiaolong Yang, Sean E. Sullivan, Tianli Feng, Li Shi, Wu Li, Xiulin Ruan
Summary: This study considers multiple factors such as phonon anharmonicity, phonon renormalization, and electron-phonon coupling on the Raman peak frequency shift and linewidth in graphene samples. The results show that four-phonon scattering contributes significantly to the linewidth, increasing with temperature, while the temperature dependence of electron-phonon interactions reverses above a certain doping threshold.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Marten Duvel, Marco Merboldt, Jan Philipp Bange, Hannah Strauch, Michael Stellbrink, Klaus Pierz, Hans Werner Schumacher, Davood Momeni, Daniel Steil, G. S. Matthijs Jansen, Sabine Steil, Dino Novko, Stefan Mathias, Marcel Reutzel
Summary: This study investigates far-from-equilibrium many-body interactions using photoelectron spectroscopy and finds remarkable transient renormalizations of the quasiparticle self-energy due to non-equilibrium conditions. These observations can be explained by ultrafast scatterings between nonequilibrium electrons and strongly coupled optical phonons.
Article
Chemistry, Multidisciplinary
Hehe Zhang, Yong Cheng, Qiaobao Zhang, Weibin Ye, Xiaohua Yu, Ming-Sheng Wang
Summary: Transition metal dichalcogenides are considered promising anode materials for potassium-ion batteries due to their high theoretical capacities. This research achieved a stress-dispersed structure to alleviate structural deterioration caused by potassium intercalation, leading to improved cycling stability and rate capacity.
Article
Multidisciplinary Sciences
Daniel Vaquero, Vito Clerico, Michael Schmitz, Juan Antonio Delgado-Notario, Adrian Martin-Ramos, Juan Salvador-Sanchez, Claudius S. A. Mueller, Km Rubi, Kenji Watanabe, Takashi Taniguchi, Bernd Beschoten, Christoph Stampfer, Enrique Diez, Mikhail I. Katsnelson, Uli Zeitler, Steffen Wiedmann, Sergio Pezzini
Summary: The researchers demonstrate a novel transport regime in which dissipation in the quantum Hall phase is predominantly governed by electron-phonon scattering in graphene encapsulated in hexagonal boron nitride.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Yichen Du, Zuyue Yi, Zhuangzhuang Zhang, Jiaying Liao, Yifan Xu, Jianchun Bao, Xiaosi Zhou
Summary: By engineering a lamellar nanostructure of multilayer graphene sheets embedded with SnTe nanoparticles, the application limitations of metal telluride in potassium-ion batteries are effectively addressed, leading to improved reaction sites, electronic transmission channels, as well as desirable cycling stability and rate performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau, Sankar Das Sarma
Summary: We investigate the competition between acoustic phonon mediated superconductivity and the long-range Coulomb interaction in moireless graphene multilayers. Our theory explains recent experimental findings in Bernal bilayer graphene and rhombohedral trilayer graphene, and predicts the existence of superconductivity in ABCA tetralayer graphene. The inclusion of realistic band structures with Van Hove singularities and Coulomb repulsion effects in our theory is crucial. Our work provides detailed predictions for graphene superconductivity induced by electron-acoustic phonon interaction, which should be investigated in future experiments.
Article
Materials Science, Multidisciplinary
Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau, Sankar Das Sarma
Summary: This article presents a systematic theory of acoustic-phonon-mediated superconductivity that incorporates Coulomb repulsion and explains recent experiments in Bernal bilayer graphene. The theory predicts that s-wave spin-singlet and f-wave spin-triplet pairings are degenerate and dominant. The results indicate that the observed spin-triplet superconductivity in Bernal bilayer graphene arises from acoustic phonons.
Article
Chemistry, Physical
Dudong Feng, Xiulin Ruan, Shannon K. Yee, Zhuomin M. Zhang
Summary: This study proposes an InSb-hBN TR device that achieves efficient waste heat recovery by coupling the hyperbolic phonon polaritons of hBN with the interband transition of InSb. The device design shows high potential in terms of output power and efficiency.
Article
Physics, Multidisciplinary
Yong Li, Weizheng Liang, Ning Li, Yongliang Chen, S. N. Luo, Yong Zhao
Summary: The coexistence of the anomalous pseudogap and superconducting states in underdoped Bi2Sr2CaCu2O8+delta at temperatures below the superconducting transition temperature was investigated using femtosecond transient optical spectroscopy. The results suggest that the pseudogap state above the superconducting transition temperature can be explained as a condensation of Cooper pairs with short coherence length.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Haiyue Huang, Hun Park, Jiaxing Huang
Summary: This article reveals the effect of dehydration on the interaction between graphene oxide (GO) sheets, indicating that dehydration can trigger self-crosslinking of GO sheets, altering their solution processability and hindering their dispersion by forming new ester bonds. This new understanding is of great significance for the processing and use of GO sheets.
Article
Chemistry, Multidisciplinary
Jiasheng Zhou, Haipeng Li, Ho-Kin Tang, Lei Shao, Kui Han, Xiaopeng Shen
Summary: In this paper, molecular dynamics simulations were used to investigate the phonon thermal transport in silicene/graphene heterostructures. The results showed that graphene dominates the thermal transport in the heterostructures, and heterostructuring can reduce the thermal conductivity of the graphene layer while increasing the thermal conductivity of the silicene layer. The interlayer interaction strength also affects the thermal conductivity and interfacial thermal resistance in the heterostructures.
Article
Chemistry, Multidisciplinary
Ievgen S. Donskyi, Chuanxiong Nie, Kai Ludwig, Jakob Trimpert, Rameez Ahmed, Elisa Quaas, Katharina Achazi, Joerg Radnik, Mohsen Adeli, Rainer Haag, Klaus Osterrieder
Summary: The study shows that graphene derivatives with long alkyl chains can effectively inhibit coronavirus replication by disrupting the viral envelope, and within a specific concentration range, these graphene platforms exhibit strong antiviral activity against the virus while showing low toxicity to human cells.
Article
Chemistry, Physical
Jacob G. Lee, Chris J. Pickard, Bingqing Cheng
Summary: This study successfully simulated the high-pressure phase transition process of titanium dioxide at high temperatures by designing a machine learning potential based on an empirical model, and constructed a pressure-temperature phase diagram. The research results have important guiding significance for the synthesis and stabilization of high-pressure titanium dioxide phases.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Zihan Zhang, Tian Cui, Michael J. Hutcheon, Alice M. Shipley, Hao Song, Mingyang Du, Vladimir Z. Kresin, Defang Duan, Chris J. Pickard, Yansun Yao
Summary: Hydrogen-based superconductors offer a way to achieve room-temperature superconductivity, but their immediate application is limited by the high pressures required. This study proposes a strategy for designing high-temperature superconductors at low pressures by alloying small-radius elements and hydrogen to form ternary H-based superconductors with alloy backbones.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
B. Q. Lv, Alfred Zong, D. Wu, A. V. Rozhkov, Boris V. Fine, Su-Di Chen, Makoto Hashimoto, Dong-Hui Lu, M. Li, Y. -B. Huang, Jacob P. C. Ruff, Donald A. Walko, Z. H. Chen, Inhui Hwang, Yifan Su, Xiaozhe Shen, Xirui Wang, Fei Han, Hoi Chun Po, Yao Wang, Pablo Jarillo-Herrero, Xijie Wang, Hua Zhou, Cheng-Jun Sun, Haidan Wen, Zhi-Xun Shen, N. L. Wang, Nuh Gedik
Summary: We report an unconventional hysteretic transition in a quasi-2D material, EuTe4, with a hysteresis loop of more than 400K temperature width, setting a record among crystalline solids. The origin of this transition lies entirely within the incommensurate charge density wave (CDW) phase of EuTe4, without any change in the CDW modulation periodicity. We interpret the hysteresis as an unusual switching of the relative CDW phases in different layers, unique to quasi-2D compounds.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Shuting Peng, Christopher Lane, Yong Hu, Mingyao Guo, Xiang Chen, Zeliang Sun, Makoto Hashimoto, Donghui Lu, Zhi-Xun Shen, Tao Wu, Xianhui Chen, Robert S. Markiewicz, Yao Wang, Arun Bansil, Stephen D. Wilson, Junfeng He
Summary: By combining experimental and theoretical studies, we investigated the pseudogap state of the cuprate superconductor Sr2IrO4. Our findings show that the pseudogap state in Sr2IrO4 exhibits different characteristics compared to competing orders, with a zero scattering wave vector and limited correlation length.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ro-Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih-Chuan Su, Shih-Chang Weng, Meng-Kai Lin, Peng Chen, Cheng-Maw Cheng, Jonathan D. Denlinger, Sung-Kwan Mo, Alexei V. Fedorov, Chia-Seng Chang, Horng-Tay Jeng, Tien-Ming Chuang, Tai-Chang Chiang
Summary: This study presents spectroscopic signatures of a predicted topological hourglass semimetal phase in Nb3SiTe6 through angle-resolved photoemission. The results show the existence of linear band crossings and nodal loops, originating from nontrivial Berry phase and predicted glide quantum spin Hall effect. The observation of saddle-like Fermi surface and in situ alkali-metal doping also reveal other band crossings and correlated parabolic bands with accidental nodal loop states.
Article
Physics, Multidisciplinary
Xiaokun Teng, Ji Seop Oh, Hengxin Tan, Lebing Chen, Jianwei Huang, Bin Gao, Jia-Xin Yin, Jiun-Haw Chu, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Garrett E. Granroth, Binghai Yan, Robert J. Birgeneau, Pengcheng Dai, Ming Yi
Summary: Electron correlations in quantum materials can lead to emergent orders, such as the topological states found in kagome lattice materials. These emergent orders are a result of the specific electronic band structure associated with the kagome lattice geometry. Various correlated electronic phases, including magnetism and superconductivity, have been discovered in kagome lattice materials. In this study, the authors observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy and provide evidence for the interplay between magnetism and charge order in this material.
Article
Multidisciplinary Sciences
Yekai Song, Chunjing Jia, Hongyu Xiong, Binbin Wang, Zhicheng Jiang, Kui Huang, Jinwoong Hwang, Zhuojun Li, Choongyu Hwang, Zhongkai Liu, Dawei Shen, Jonathan A. Sobota, Patrick Kirchmann, Jiamin Xue, Thomas P. Devereaux, Sung-Kwan Mo, Zhi-Xun Shen, Shujie Tang
Summary: The authors report electronic properties of monolayer ZrTe2 from ARPES and STM measurements that are consistent with the preformed exciton gas phase, a precursor for the excitonic insulator.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
J. Qu, X. Han, S. Sakamoto, C. J. Jia, J. Liu, H. Li, D. Guan, Y. -J. Zeng, M. Schuler, P. S. Kirchmann, B. Moritz, Z. Hussain, T. P. Devereaux, Z. -X Shen, J. A. Sobota
Summary: Spin-orbit coupling is the foundation for quantum materials with non-trivial topology and potential spintronics applications. The Rashba interaction is a representative model of spin-orbit interactions, and BiTeX (X = Cl, Br, I) semiconductors have been identified as exemplary Rashba materials. However, a detailed investigation of their spin textures and their relationship to local crystal symmetry is currently lacking. In this study, we directly image the spin texture of surface states of BiTeCl and find deviations from ideal behavior, including spin-polarization reversal near the Fermi level. These effects are described by higher-order contributions to the canonical Rashba model.
NPJ QUANTUM MATERIALS
(2023)
Article
Instruments & Instrumentation
Xue Han, Jason Qu, Shoya Sakamoto, Dongyu Liu, Dandan Guan, Jin Liu, Hui Li, Costel R. Rotundu, Nord Andresen, Chris Jozwiak, Zahid Hussain, Zhi-Xun Shen, Jonathan A. Sobota
Summary: This paper introduces a spin-ARPES setup based on time-of-flight spectroscopy and an electrostatic deflector mode for mapping spin-resolved band structures without sample rotation. The functionality of the setup is demonstrated by presenting spin-resolved spectra of the topological insulator Bi2Te3 and describing the spectrum calibrations based on numerical simulations. Implementing the deflector mode minimizes the need for sample rotation and improves the overall efficiency of experiments on small or inhomogeneous samples.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Dushyant M. Narayan, Peipei Hao, Rafal Kurleto, Bryan S. Berggren, A. Garrison Linn, Christopher Eckberg, Prathum Saraf, John Collini, Peter Zavalij, Makoto Hashimoto, Donghui Lu, Rafael M. Fernandes, Johnpierre Paglione, Daniel S. Dessau
Summary: The study investigates the superconductivity of Ba1-xSrxNi2As2 series and finds that isovalent substitution weakens the charge and nematic orders but enhances the superconducting transition temperature. The analysis reveals the presence of reasonably nested electron and hole Fermi pockets with Ni d(xz)/d(yz) orbital compositions within the optimal substitution range, which are associated with the enhancement of nematic fluctuations.
Article
Nanoscience & Nanotechnology
Ji-Eun Lee, Kyoo Kim, Van Quang Nguyen, Jinwoong Hwang, Jonathan D. Denlinger, Byung Il Min, Sunglae Cho, Hyejin Ryu, Choongyu Hwang, Sung-Kwan Mo
Summary: The thermoelectric performance of SnSe is strongly influenced by the low-energy electron band structure, which provides a high density of states in a narrow energy range due to the multi-valley valence band maximum (VBM). The binding energy of the VBM in SnSe is found to be tuned by the population of Sn vacancies, which is determined by the cooling rate during sample growth, as revealed by angle-resolved photoemission spectroscopy measurements and first-principles calculations. The shift in VBM closely correlates with the thermoelectric power factor, while the effective mass remains largely unchanged with variations in Sn vacancy population. These findings demonstrate that the low-energy electron band structure plays a crucial role in the high thermoelectric performance of hole-doped SnSe, offering a promising route to engineering intrinsic defect-induced thermoelectric performance through sample growth conditions without requiring additional ex-situ processes.
Article
Materials Science, Multidisciplinary
Jonathan A. Sobota, Samuel W. Teitelbaum, Yijing Huang, Jose D. Querales-Flores, Robert Power, Meabh Allen, Costel R. Rotundu, Trevor P. Bailey, Ctirad Uher, Tom Henighan, Mason Jiang, Diling Zhu, Matthieu Chollet, Takahiro Sato, Mariano Trigo, eamonn D. Murray, Ivana Savic, Patrick S. Kirchmann, Stephen Fahy, David A. Reis, Zhi-Xun Shen
Summary: We investigated the coupled electron-lattice dynamics in Bi2Te3 using time-resolved photoemission and time-resolved x-ray diffraction. Our findings show that the topological surface state couples to additional modes, including a continuum of surface-projected bulk modes from both Raman and infrared branches, and possibly surface-localized modes. These results suggest that coherent phonon spectra can be used as unique fingerprints for identifying surface states in controversial materials and can potentially be used to tailor surface state wave functions through ultrafast optical excitation.
