Article
Multidisciplinary Sciences
Yuki M. Itahashi, Toshiya Ideue, Shintaro Hoshino, Chihiro Goto, Hiromasa Namiki, Takao Sasagawa, Yoshihiro Iwasa
Summary: The authors observe second-order nonlinear transport in time-reversal-symmetric PbTaSe2, where the nonlinearity is enhanced in the superconducting state.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Kirstine Junker Dalgaard, Simone Munkholm Kevy, Laura Wollesen, Qing Ma, Steffen Wiedmann, Kajsa G. V. Sigfridsson Clauss, Martin Bremholm
Summary: This study investigates the prospect of achieving bulk superconductivity in a topological insulator. By studying metal-doped Bi2Se3 systems, it is found that Nb is primarily located in a local environment consistent with a misfit layer structure, and shows negligible occupancy in the vdW gap according to difference density maps. These findings underscore the importance of thorough structural characterization of these samples.
Article
Materials Science, Multidisciplinary
Simone M. Kevy, Henriette E. Lund, Laura Wollesen, Kirstine J. Dalgaard, Yu-Te Hsu, Steffen Wiedmann, Marco Bianchi, Ann Julie Utne Holt, Davide Curcio, Deepnarayan Biswas, Alfred J. H. Jones, Klara Volckaert, Cephise Cacho, Pavel Dudin, Philip Hofmann, Martin Bremholm
Summary: Investigation of crystals with the nominal composition Nb0.25Bi2Se3 reveals phase segregation and major contributions of BiSe and (BiSe)1.1NbSe2. The inhomogeneous character of the samples is reflected in the electronic structure and transport properties, with high-quality topological surface states observed using nanoARPES. The superconducting transition temperature varies between 2.5 and 3.5 K, with filamentary superconductivity suggested in the majority of bulk single crystals. Susceptibility measurements and coherence length analysis suggest conventional BCS superconductivity in the system.
Article
Chemistry, Multidisciplinary
Nasir Mahmood, Joohoon Kim, Muhammad Ashar Naveed, Yeseul Kim, Junhwa Seong, Seokwoo Kim, Trevon Badloe, Muhammad Zubair, Muhammad Qasim Mehmood, Yehia Massoud, Junsuk Rho
Summary: Recent advancements in technology have allowed for the manipulation of light's intrinsic properties using Metasurfaces. This study presents a broadband multifunctional Metasurfaces platform that can independently control the phase profile for two orthogonal polarization states of incident light over dual-wavelength spectra.
Article
Physics, Multidisciplinary
Jialun Liu, Chennan Wang, Tong Lin, Liye Cao, Lei Wang, Jiaji Li, Zhen Tao, Nan Shen, Rina Wu, Aifang Fang, Nanlin Wang, Rongyan Chen
Summary: Using infrared spectroscopy, the charge dynamics of the topological superconductor candidate Sr x Bi2Se3 were studied. The frequency-dependent reflectivity R(omega) showed metallic feature and the scattering rate of the free carriers decreased with temperature decreasing. The plasma edge exhibited a slight blue shift upon cooling, similar to Cu x Bi2Se3 behavior. Additionally, ultrafast pump-probe study on the Sr0.2Bi2Se3 compounds revealed three distinct relaxation processes and an electron-optical-phonon coupling constant of lambda = 0.88.
Article
Physics, Multidisciplinary
Zimin Jiang, Dequan Jiang, Yiming Wang, Chen Li, Ke Liu, Ting Wen, Fuyang Liu, Zhengyang Zhou, Yonggang Wang
Summary: Symmetry breaking of metal cluster-based strongly correlated systems can result in collective phenomena. In this study, the two-dimensional Nb-3 cluster compound Nb3Cl8 was found to undergo significant symmetry breaking and electron disproportionation under compression. A structural phase transition from trigonal P-3m1 to monoclinic C2/m was observed near 8 GPa, accompanied by a breaking of three-fold symmetry. The electron disproportionation on Nb-3 clusters, from delocalized Nb8/3+Nb8/3+Nb8/3+ to localized Nb3+Nb3+Nb2+, resulted in a subtle change in bandgap, as confirmed by electrical transport and UV-Vis absorption measurements.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Jia-nan Liu, Xu Yang, Haopu Xue, Xue-song Gai, Rui Sun, Yang Li, Zi-Zhao Gong, Na Li, Zong-Kai Xie, Wei He, Xiang-Qun Zhang, Desheng Xue, Zhao-Hua Cheng
Summary: With decreasing thickness of topological insulator thin films, single-particle band theory is insufficient to explain their band structures. This study reconstructs the surface-state coupling in ultrathin films using screened Coulomb interaction and finds that the magnitude of the mass gap agrees well with experimental results.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Huanyi Xue, Lijie Wang, Zhongjie Wang, Guanqun Zhang, Wei Peng, Shiwei Wu, Chun-Lei Gao, Zhenghua An, Yan Chen, Wei Li
Summary: This study reports the superconducting properties of LiTi2O4 films with pronounced fourfold rotational symmetry, showing that it is an intrinsic property of the superconducting phase. The study also reveals the unconventional d-wave superconducting Cooper pairs in this superconducting phase.
Article
Chemistry, Physical
Min Zhang, Qiya Liu, Ligang Liu
Summary: High quality CxBi2Se3-x single crystals were prepared by melt-grown reaction. Doping leads to the presence of ferromagnetism and high external magnetic field induces the metal-insulation transition. The results suggest that CxBi2Se3-x single crystals may be candidate materials for topological half-metals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
A. de la Torre, K. L. Seyler, L. Zhao, S. Di Matteo, M. S. Scheurer, Y. Li, B. Yu, M. Greven, S. Sachdev, M. R. Norman, D. Hsieh
Summary: The study reveals the existence of a magneto-chiral state in cuprates that may be relevant to superconductivity, with its characteristics still captured at extremely low temperatures.
Article
Nanoscience & Nanotechnology
Faizan Ahmad, Rachana Kumar, Sunil Singh Kushvaha, Mahesh Kumar, Pramod Kumar
Summary: This study analyzed the n-GaN/p-Bi2Se3 topological heterojunction using Raman spectroscopy and ultrafast transient absorption spectroscopy, exploring the surface states, energy levels, charge transfer, and carrier relaxation processes. Electrical measurements were also conducted to investigate the influence of interface states on the electrical and optical performance.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
M. Bannikov, R. S. Akzyanov, N. K. Zhurbina, S. Khaldeev, Yu G. Selivanov, V. V. Zavyalov, A. L. Rakhmanov, A. Yu Kuntsevich
Summary: Researchers conducted experiments on the anisotropy of the upper critical magnetic field H_c2 in high-quality SrxBi2Se3 single crystals, and observed that the anisotropy smoothly decreases with increasing temperature, contradicting theoretical predictions.
Article
Chemistry, Inorganic & Nuclear
Hiroki Ubukata, Daichi Kato, Shougo Kitade, Thibault Broux, Cedric Tassel, David Schnieders, Richard Dronskowski, Hiroshi Kageyama
Summary: Lanthanide hydride chalcogenides LnHSe and LnHTe crystallize in 2H and 1H structures, respectively. We expanded the LnHCh (Ch = O, Se, and Te) family to include LnHS (Ln = La, Nd, Gd, and Er) and found that larger Ln prefers the 2H structure while smaller Er prefers the 1H structure. The stability of the 2H structure can be attributed to the relatively small electrostatic repulsion between ChLn6 octahedra.
INORGANIC CHEMISTRY
(2023)
Article
Optics
Dimitrios Chatzidimitriou, Alexandros Pitilakis, Traianos Yioultsis, Emmanouil E. Kriezis
Summary: The study explores the breaking of reciprocity in non-Hermitian coupled photonic waveguides through saturable absorption and the presence of exceptional points, providing important performance metrics for nonreciprocal operation of such devices with potential for high-speed applications.
Article
Physics, Multidisciplinary
Zhi-Wei Hu, Xiang-Gang Qiu
Summary: Ultrathin superconducting Nb films were deposited on heavily doped Si substrates, and high-quality Nb/Si superconductor-semiconductor heterojunctions were fabricated. An abnormal magnetoresistance effect, observed as a zero field resistance peak, was explained by the Andreev reflection mechanism. These findings are significant for the development of silicon-based nanoscale superconducting devices for integrated circuits and superconducting quantum electronics.
Article
Chemistry, Multidisciplinary
Xiaoran Liu, Sobhit Singh, Victor Drouin-Touchette, Tomoya Asaba, Jess Brewer, Qinghua Zhang, Yanwei Cao, Banabir Pal, Srimanta Middey, P. S. Anil Kumar, Mikhail Kareev, Lin Gu, D. D. Sarma, Padraic Shafer, Elke Arenholz, John W. Freeland, Lu Li, David Vanderbilt, Jak Chakhalian
Summary: In a designer lattice with high magnetic frustration, a quantum spin liquid state is potentially realized through experiments and theoretical calculations. The absence of spin ordering or freezing transition in an ultrathin CoCr2O4 slice is attributed to strong antiferromagnetic correlations and competition among altered exchange interactions.
Article
Physics, Multidisciplinary
Ziji Xiang, Lu Chen, Kuan-Wen Chen, Colin Tinsman, Yuki Sato, Tomoya Asaba, Helen Lu, Yuichi Kasahara, Marcelo Jaime, Fedor Balakirev, Fumitoshi Iga, Yuji Matsuda, John Singleton, Lu Li
Summary: The study reveals that clear quantum oscillations exist in YbB12, despite its high resistivity and huge Kadowaki-Woods ratio. Furthermore, tracking the Fermi surface area shows that the same quasiparticle band gives rise to quantum oscillations in both insulating and metallic states. The observations can be most simply understood using a two-fluid model, indicating the coexistence of neutral quasiparticles and charged fermions in the system.
Article
Multidisciplinary Sciences
T. Asaba, V Ivanov, S. M. Thomas, S. Y. Savrasov, J. D. Thompson, E. D. Bauer, F. Ronning
Summary: In UCo0.8Ru0.2Al, a colossal anomalous Nernst effect (ANE) is observed due to strong electronic correlations from uranium's 5f electrons and narrow bands, leading to a large thermoelectric response. Additionally, uranium's strong spin-orbit coupling results in an intrinsic transverse response in this material related to the Berry curvature associated with the relativistic electronic structure.
Article
Chemistry, Multidisciplinary
Xiaoqian Zhang, Wenqing Liu, Wei Niu, Qiangsheng Lu, Wei Wang, Ali Sarikhani, Xiaohua Wu, Chunhui Zhu, Jiabao Sun, Mitchel Vaninger, Paul F. Miceli, Jianqi Li, David J. Singh, Yew San Hor, Yue Zhao, Chang Liu, Liang He, Rong Zhang, Guang Bian, Dapeng Yu, Yongbing Xu
Summary: This research reports a method to engineer antiferromagnetic magnets in an ultra-high vacuum-free condition. By introducing interstitial Cr atoms in the vdW gaps, interlayer antiferromagnetic coupling is achieved, leading to giant magnetoresistance effect and switching between states at moderate magnetic fields. This work provides a new approach for studying 2D magnetism and constructing low-power devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Ziji Xiang, Kuan-Wen Chen, Lu Chen, Tomoya Asaba, Yuki Sato, Nan Zhang, Dechen Zhang, Yuichi Kasahara, Fumitoshi Iga, William A. Coniglo, Yuji Matsuda, John Singleton, Lu Li
Summary: This study presents a detailed investigation of the behavior of YbB12 in intense magnetic fields using both transport and torque magnetometry measurements. The results suggest the presence of field-induced Lifshitz transitions and support a novel two-fluid scenario in YbB12, where a Fermi-liquid-like fluid of charge-neutral quasiparticles coexists with nonmetallic charge carriers.
Article
Materials Science, Multidisciplinary
Ke Ma, Shifeng Jin, Fanqi Meng, Qinghua Zhang, Ruijin Sun, Jun Deng, Long Chen, Lin Gu, Gang Li, Zhihua Zhang
Summary: Clean 2D superconductivity and bosonic Landau levels have been observed in superlattice van der Waals material Ba6Nb11S28. The crystal structure and transport properties of the compound have been investigated, showing enhancements in superconducting temperature and a decrease in anisotropy compared to its sulfur counterpart. The measurements also suggest that the superconductivity in Ba6Nb11S28 breaks the Pauli limit and can be described by the 2D Tinkham form. These findings provide valuable insights into 2D superconductivity in bulk superlattice materials based on transition-metal dichalcogenides.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Instruments & Instrumentation
Guoxin Zheng, Dechen Zhang, Kuan-Wen Chen, John Singleton, Lu Li
Summary: This article presents a solution to the challenges posed by mechanical vibrations and rapid magnetic field changes in conventional magnetometry. It introduces a new magnetometry technique using high-frequency quartz oscillators, which takes advantage of the symmetry and geometry of mechanical vibration configurations to achieve high sensitivity.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Multidisciplinary
J. Guo, A. Sarikhani, P. Ghosh, T. Heitmann, Y. S. Hor, D. K. Singh
Summary: Magnetic semiconductors, specifically (Zn1-xCrx)Te, were studied using elastic neutron scattering and density functional calculations, uncovering the intrinsic properties of the ferromagnetic state in (Zn0.8Cr0.2)Te. The ferromagnetism onset was observed at around 290 K and remained independent of moderate changes in the substitution coefficient x. Magnetic moments on Zn/Cr sites exhibited ferromagnetic correlation in the a-c plane with a large ordered moment of mu = 3.08 mu(B), induced via the mediation of Te sites. Ab initio calculations also revealed half-metallicity in the composition of x = 0.2, making these properties highly desirable for future spintronic applications.
Article
Materials Science, Multidisciplinary
L. Peng, M. Naritsuka, S. Akutagawa, S. Suetsugu, M. Haze, Y. Kasahara, T. Terashima, R. Peters, Y. Matsuda, T. Asaba
Summary: We used in situ scanning tunneling microscopy to study atomically thin films of CeCoIn5 and found evidence of superconductivity mediated by purely two-dimensional bosonic excitations in even monolayer CeCoIn5. The critical temperature of these thin films is suppressed compared to the bulk material, but similar to superlattices with CeCoIn5 layers of the same thickness. The out-of-plane upper critical field at zero temperature is significantly enhanced in the thin films, suggesting the emergence of unusual superconductivity with parity mixing caused by inversion symmetry breaking.
Article
Materials Science, Multidisciplinary
Kuan-Wen Chen, Guoxin Zheng, Dechen Zhang, Aaron Chan, Yuan Zhu, Kaila Jenkins, Fanghang Yu, Mengzhu Shi, Jianjun Ying, Ziji Xiang, Xianhui Chen, Ziqiang Wang, John Singleton, Lu Li
Summary: In the recently discovered kagome metal CsV3Sb5, the presence of small Chern Fermi pockets hosting spontaneous orbital-currents and large orbital magnetic moments has been proposed. By using the spin-zero effect in magnetic quantum oscillations, the g-factor of this system has been determined, showing a large enhancement only in magnetic breakdown orbits between conventional and concentrated Berry curvature Fermi pockets. This interplay between electronic correlations and conventional electronic bands provides a remarkable example in quantum materials.
COMMUNICATIONS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jin-Feng Wang, Qing-Xin Dong, Zhao-Peng Guo, Meng Lv, Yi-Fei Huang, Jun-Sen Xiang, Zhi-An Ren, Zhi-Jun Wang, Pei-Jie Sun, Gang Li, Gen-Fu Chen
Summary: In this study, we characterized a newly proposed MWSM candidate NdAlSi using experimental measurements and theoretical calculations. NdAlSi exhibits unique magnetic behavior by breaking both time-reversal and spatial inversion symmetries. Our results indicate that 4f-electron-based MWSMs could serve as an important platform for exploring novel quantum phenomena arising from the interaction between magnetism and electron topology.
Article
Materials Science, Multidisciplinary
W. L. Zhu, Y. Cao, P. J. Guo, X. Li, Y. J. Chen, L. J. Zhu, J. B. He, Y. F. Huang, Q. X. Dong, Y. Y. Wang, R. Q. Zhai, Y. B. Ou, G. Q. Zhu, H. Y. Lu, G. Li, G. F. Chen, M. H. Pan
Summary: In this study, we systematically investigated the magnetoresistance, Hall effect, and electronic structure in an iodine-intercalated tungsten ditelluride single crystal. The compound exhibited significant anisotropic magnetotransport behavior and a novel nonsaturating linear magnetoresistance. Hall effect analysis indicated lower carrier mobility, likely caused by disorder effects. First-principles calculations revealed a topological phase transition in the electronic structure.
Article
Materials Science, Multidisciplinary
Zhenyuan Zeng, Xiaoyan Ma, Si Wu, Hai-Feng Li, Zhen Tao, Xingye Lu, Xiao-hui Chen, Jin-Xiao Mi, Shi-Jie Song, Guang-Han Cao, Guangwei Che, Kuo Li, Gang Li, Huiqian Luo, Zi Yang Meng, Shiliang Li
Summary: This study investigates the magnetic properties of YCu3(OH)(6)Br-2[Br1-x(OH)(x)] and finds that its magnetic ground state is consistent with the proposed candidate ground state in the two-dimensional kagome Heisenberg antiferromagnetic system.
Article
Materials Science, Multidisciplinary
T. Asaba, S. Lee, S. Seo, K. E. Avers, S. M. Thomas, R. Movshovich, J. D. Thompson, P. F. S. Rosa, E. D. Bauer, F. Ronning
Summary: YbFe5P3 is a quasi-one-dimensional heavy-fermion compound with good metallic properties and strong quantum fluctuations, exhibiting a modified Curie-Weiss behavior at high temperatures without magnetic ordering observed. Density functional theory calculations suggest a complex Fermi surface structure in this compound, leading to an extended regime of large quantum fluctuations prior to magnetic instability.
