Article
Physics, Multidisciplinary
Reena Yadav, Biplab Bhattacharyya, Animesh Pandey, Mandeep Kaur, Anurag Gupta, Sudhir Husale
Summary: This paper investigates the induced superconductivity in Bi2Se3 flakes through electric transport measurements in a hybrid structure composed of Bi2Se3 topological insulator thin flakes and tungsten (W) superconducting electrodes. The resistance of the flakes decreases significantly when the electrodes become superconducting, even when the length of the flakes exceeds the superconducting coherence length. Additionally, the magnetoresistance of the flakes changes from negative to positive above the transition temperature due to the effects of the superconducting electrodes.
Article
Multidisciplinary Sciences
Alon Gutfreund, Hisakazu Matsuki, Vadim Plastovets, Avia Noah, Laura Gorzawski, Nofar Fridman, Guang Yang, Alexander Buzdin, Oded Millo, Jason W. A. Robinson, Yonathan Anahory
Summary: The interplay between magnetism and superconductivity can give rise to unconventional proximity and Josephson effects. A recent phenomenon attracting considerable attention is the superconducting diode effect, where a nonreciprocal critical current emerges. Although superconducting diodes based on superconductor/ferromagnet (S/F) bilayers were demonstrated more than a decade ago, the underlying mechanism remains unclear. The authors directly observe asymmetric vortex dynamics that reveal the mechanism behind the superconducting vortex diode effect in Nb/EuS (S/F) bilayers.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Eva Cortes del Rio, Jose Luis Lado, Vladimir Cherkez, Pierre Mallet, Jean-Yves Veuillen, Juan Carlos Cuevas, Jose Maria Gomez-Rodriguez, Joaquin Fernandez-Rossier, Ivan Brihuega
Summary: The study demonstrates the first observation of Yu-Shiba-Rusinov states in graphene, a non-superconducting 2D material, without the involvement of magnetic atoms. Using scanning tunneling microscopy and spectroscopy, these special Yu-Shiba-Rusinov states were found to have local magnetic properties and can extend beyond the grain boundaries.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ze-Qi Zhang, Yu-Chen Pei, Ming-Jun Xiao, Guowen Hu, Zhi-Peng Huang, Tao Song, Qiang Wang, Wen-Yu Huang, Yong Peng, Hao-Li Zhang
Summary: The research uncovered the reversible dynamic structural transition of PtSn intermetallic compound nanoparticle catalysts during deactivation and regeneration, providing a direct correlation between the atomic structure and the catalytic activity of the nanoparticles.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Binbin Fan, Jilei Liu, Yali Xu, Qunli Tang, Yan Zhang, Xiaohua Chen, Aiping Hu
Summary: A scalable and facile one-pot spray pyrolysis method combined with reduction process during hydrogen atmosphere at a low temperature of 400 degrees C is developed for the formation of Sn@SnO2-3DGHPC materials, demonstrating high reversible capacity, outstanding cycling stability, and rate capability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Condensed Matter
Ang Ding, Tianjun Li, Dongxing Wang, Javid Muhammad, Asif Shah, Xinglong Dong, Zhidong Zhang
Summary: Tin oxide-encapsulated tin nanoparticles (Sn@SnOx NCs) were prepared in situ using a modified DC arc-discharge plasma process. The electrical properties of the Sn@SnOx NCs were found to be affected by the thickness of the SnOx shell. Superconductivity was observed in Sn@SnOx NCs with diameters of 50-80 nm at temperatures below the superconducting transition temperature.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Cesar Gonzalez-Ruano, Diego Caso, Jabir Ali Ouassou, Coriolan Tiusan, Yuan Lu, Jacob Linder, Farkhad G. Aliev
Summary: Superconductor-ferromagnet tunnel junctions have been used to engineer ultrasensitive terahertz radiation detectors by exploiting their giant thermoelectric effects. In this study, we experimentally observe complete magnetic control over the thermoelectric effects in a superconducting spin valve, including a dependence on the magnetism of the spin valve. The application of high in-plane magnetic fields leads to a double sign inversion of the thermoelectric effect, which remains large even at fields twice the superconducting critical field.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Xinsheng Tan, Dan-Wei Zhang, Wen Zheng, Xiaopei Yang, Shuqing Song, Mikun Han, Yuqian Dong, Zhimin Wang, Dong Lan, Hui Yan, Shi-Liang Zhu, Yang Yu
Summary: Monopoles are important in physics, with two fundamental types: vector monopoles and tensor monopoles. While vector monopoles have been extensively studied and observed in condensed matter, tensor monopoles are less studied and their observation has not been reported yet. Through experimental methods, the energy structure of a 4D Weyl-like Hamiltonian with tensor monopoles has been imaged, and the first experiment measuring Dixmier-Douady invariant for tensor monopoles has been reported. The observation of topological phase transitions characterized by the Dixmier-Douady invariant is a significant finding in this study.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Fusheng Chen, Zheng-Hang Sun, Ming Gong, Qingling Zhu, Yu-Ran Zhang, Yulin Wu, Yangsen Ye, Chen Zha, Shaowei Li, Shaojun Guo, Haoran Qian, He-Liang Huang, Jiale Yu, Hui Deng, Hao Rong, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, Jian-Wei Pan
Summary: This experimental study investigates the ergodic dynamics of a 1D array of 12 superconducting qubits with a transverse field, identifying strong and weak thermalization regimes. In the strong-thermalization regime, local observables converge to their thermal expectation values, while in the weak-thermalization regime, local observables exhibit oscillations around thermal values that require time averaging. Additionally, the study demonstrates that entanglement entropy and concurrence can characterize these distinct thermalization regimes.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Qingling Zhu, Zheng-Hang Sun, Ming Gong, Fusheng Chen, Yu-Ran Zhang, Yulin Wu, Yangsen Ye, Chen Zha, Shaowei Li, Shaojun Guo, Haoran Qian, He-Liang Huang, Jiale Yu, Hui Deng, Hao Rong, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, Jian-Wei Pan
Summary: Understanding phenomena in nonequilibrium dynamics of closed quantum many-body systems is crucial. This study uses a ladder-type superconducting quantum processor to simulate different models and reveals quantum thermalization and information scrambling. The controllable qubit ladder shows ergodicity and scrambling.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Bingyang Gao, Xiangrui Meng, Enyu Guo, Hui Liang, Zhiqiang Cao, Tongmin Wang
Summary: Cu6Sn5 and Cu3Sn are important intermetallic compounds in the Sn-Cu solder system. Micro-alloying Ni has been proved to be effective in suppressing Cu6Sn5 and increasing the grain density with Ni addition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Huifeng Chen, Yang Liu, Shuang Zhang, Rongxing Cao, Yuxiong Xue
Summary: Four Sn-Ag-x leveling layers were coated on Cu substrate to improve the reliability of Sn-58Bi solder joints under thermal cycling. The microstructure, interfacial intermetallic compounds (IMC), and shear behavior of the solder joints were investigated. The addition of Sn-Ag-x leveling layers effectively suppressed the growth of IMC layer and reduced brittle damage induced by thermal cycling.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Astronomy & Astrophysics
N. N. Chugai
Summary: The study explores the circumstellar H alpha and H beta absorption lines in the spectrum of the luminous type IIL SN 2008fq, suggesting interaction with a confined dense shell. Modelling of a similar type IIL SN 1998S indicates a comparable shell mass. The larger confined dense shell mass in type IIL supernovae compared to type IIP supernovae is attributed to the larger progenitor mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
News Item
Physics, Multidisciplinary
Kun Jiang, Jiangping Hu
Summary: The article discusses two demonstrations of a superconducting diode effect, showing the possibility of equivalent behavior in superconductors through different mechanisms.
Article
Physics, Applied
Yuta Miyasaka, Ryo Kawarazaki, Hideki Narita, Fuyuki Ando, Yuhei Ikeda, Ryusuke Hisatomi, Akito Daido, Yoichi Shiota, Takahiro Moriyama, Youichi Yanase, Teruo Ono
Summary: This study demonstrates that nonreciprocal superconducting behavior can be achieved in a [Nb/V/Ta](n) superlattice without a center of inversion under an electric current bias, showing clear differences between positive and negative magnetic fields. Moreover, the magnitude relation between positive and negative critical magnetic fields can be reversed by changing the direction of the electric current, suggesting that the superconducting gap can exhibit anisotropy through the application of electric current.
APPLIED PHYSICS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
H. Gonzalez-Herrero, E. Cortes-del Rio, P. Mallet, J-Y Veuillen, J. J. Palacios, J. M. Gomez-Rodriguez, I. Brihuega, F. Yndurain
Editorial Material
Chemistry, Physical
Miguel M. Ugeda
Article
Multidisciplinary Sciences
Sara Barja, Sivan Refaely-Abramson, Bruno Schuler, Diana Y. Qiu, Artem Pulkin, Sebastian Wickenburg, Hyejin Ryu, Miguel M. Ugeda, Christoph Kastl, Christopher Chen, Choongyu Hwang, Adam Schwartzberg, Shaul Aloni, Sung-Kwan Mo, D. Frank Ogletree, Michael F. Crommie, Oleg Yazyev, Steven G. Louie, Jeffrey B. Neaton, Alexander Weber-Bargioni
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
C. Dutreix, H. Gonzalez-Herrero, I. Brihuega, M. I. Katsnelson, C. Chapelier, V. T. Renard
Article
Chemistry, Multidisciplinary
Carmen Rubio-Verdu, Antonio M. Garcia-Garcia, Hyejin Ryu, Deung-Jang Choi, Javier Zaldivar, Shujie Tang, Bo Fan, Zhi-Xun Shen, Sung-Kwan Mo, Jose Ignacio Pascual, Miguel M. Ugeda
Article
Chemistry, Multidisciplinary
Eva Cortes-del Rio, Pierre Mallet, Hector Gonzalez-Herrero, Jose Luis Lado, Joaquin Fernandez-Rossier, Jose Maria Gomez-Rodriguez, Jean-Yves Veuillen, Ivan Brihuega
ADVANCED MATERIALS
(2020)
Article
Physics, Multidisciplinary
Shawulienu Kezilebieke, Md Nurul Huda, Paul Dreher, Ilkka Manninen, Yifan Zhou, Jani Sainio, Rhodri Mansell, Miguel M. Ugeda, Sebastiaan van Dijken, Hannu-Pekka Komsa, Peter Liljeroth
COMMUNICATIONS PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Eva Cortes del Rio, Jose Luis Lado, Vladimir Cherkez, Pierre Mallet, Jean-Yves Veuillen, Juan Carlos Cuevas, Jose Maria Gomez-Rodriguez, Joaquin Fernandez-Rossier, Ivan Brihuega
Summary: The study demonstrates the first observation of Yu-Shiba-Rusinov states in graphene, a non-superconducting 2D material, without the involvement of magnetic atoms. Using scanning tunneling microscopy and spectroscopy, these special Yu-Shiba-Rusinov states were found to have local magnetic properties and can extend beyond the grain boundaries.
ADVANCED MATERIALS
(2021)
Article
Physics, Condensed Matter
Simon Divilov, Wen Wan, Paul Dreher, Emre Bolen, Daniel Sanchez-Portal, Miguel M. Ugeda, Felix Yndurain
Summary: Using spin-resolved density functional theory calculations, the study reveals that the most stable ground state of single-layer NbSe2 is ferrimagnetic, which prevents the development of charge density wave order. The calculated density of states accurately reproduces the experimental electronic and magnetic structure, highlighting the importance of magnetism in understanding the formation mechanisms of 2D superconductivity and CDW order.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Mariano D. Jimenez-Sanchez, Ivan Brihuega, Nicoleta Nicoara, Julio Gomez-Herrero, Jose M. Gomez-Rodriguez
Summary: This study overcomes the challenge of loss of spatial resolution in Atomic Force Microscopy (AFM) due to long-range interactions by selectively extracting single metallic nanoclusters grown on graphene. The created nanotips are stable and can be used to explore different surfaces without loss of resolution, opening up possibilities for specific functionalization of AFM tips to sense a variety of interactions.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Wen Wan, Darshana Wickramaratne, Paul Dreher, Rishav Harsh, Igor I. Mazin, Miguel M. Ugeda
Summary: This study investigates the evolution of the electronic ground state of a monolayer of Nb1-delta Mo delta Se2 across the entire alloy composition range. It is found that Mo doping decreases the density of states at the Fermi level and the magnitude of pair-breaking spin fluctuations. These results have significant implications for future 2D materials design.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wen Wan, Paul Dreher, Daniel Munoz-Segovia, Rishav Harsh, Haojie Guo, Antonio J. Martinez-Galera, Francisco Guinea, Fernando de Juan, Miguel M. Ugeda
Summary: This study reports the existence of a soft collective mode in single-layer NbSe2, observed as a characteristic resonance excitation in high-resolution tunneling spectra. The frequency and amplitude of this resonance change with temperature and magnetic field, establishing a direct link to the superconducting state.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Wen Wan, Rishav Harsh, Paul Dreher, Fernando de Juan, Miguel M. Ugeda
Summary: Chemical substitution is a promising approach to explore collective phenomena in low-dimensional quantum materials. Transition metal dichalcogenide alloys are shown to be ideal platforms for this purpose. We demonstrate the emergence of superconductivity in single-layer TaSe2 through minute electron doping using substitutional W atoms. The temperature and magnetic field dependence of the superconducting state of Ta1-delta W delta Se2 are investigated using scanning tunneling spectroscopy. A superconducting dome spanning 0.003 < delta < 0.03 with a maximized critical temperature of 0.9 K is observed, which is significantly higher than that of bulk TaSe2 (T-C = 0.14 K). The superconductivity is attributed to an increase in density of states as the Fermi surface approaches a van Hove singularity, but gradually weakens as the singularity is reached, shaping the superconducting dome. Doping-dependent measurements suggest the development of a Coulomb glass phase triggered by disorder due to W dopants.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Astronomy & Astrophysics
Clement Dutreix, Hector Gonzalez-Herrero, Ivan Brihuega, Mikhail Katsnelson, Claude Chapelier, Vincent T. Renard
Summary: The Berry phase affects the static response of electrons to a single atomic scatterer, providing a new experimental method to measure the graphene Berry phase without the need for a magnetic field. This study demonstrates that local disorder can be utilized as a probe for topological quantum matter in scanning tunnelling microscopy experiments.
COMPTES RENDUS PHYSIQUE
(2021)
Article
Materials Science, Multidisciplinary
Bradford A. Barker, Aaron J. Bradley, Miguel M. Ugeda, Sinisa Coh, Alex Zettl, Michael F. Crommie, Steven G. Louie, Marvin L. Cohen