Article
Physics, Multidisciplinary
J. Choi, Q. Wang, S. Joehr, N. B. Christensen, J. Kuespert, D. Bucher, D. Biscette, M. H. Fischer, M. Huecker, T. Kurosawa, N. Momono, M. Oda, O. Ivashko, M. Zimmermann, M. Janoschek, J. Chang
Summary: In the cuprates, the unidirectional nature of the CDW in La1.88Sr0.12CuO4 was established using x-ray diffraction with uniaxial pressure. A significant enhancement of the CDW amplitude was found when homogeneous superconductivity was partially suppressed by a magnetic field.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Matteo Rossi, Motoki Osada, Jaewon Choi, Stefano Agrestini, Daniel Jost, Yonghun Lee, Haiyu Lu, Bai Yang Wang, Kyuho Lee, Abhishek Nag, Yi-De Chuang, Cheng-Tai Kuo, Sang-Jun Lee, Brian Moritz, Thomas P. Devereaux, Zhi-Xun Shen, Jun-Sik Lee, Ke-Jin Zhou, Harold Y. Hwang, Wei-Sheng Lee
Summary: A charge ordering state has been observed in nickelate superconductors, which is distinct from other observed ordered states. The results suggest that strong electronic correlations may be responsible for this ordered state, and the interplay between charge order, antiferromagnetic fluctuations, and superconductivity is an important topic in nickel-based superconductors.
Article
Physics, Multidisciplinary
Hong Li, He Zhao, Brenden R. R. Ortiz, Yuzki Oey, Ziqiang Wang, Stephen D. D. Wilson, Ilija Zeljkovic
Summary: Kagome metals AV(3)Sb(5) exhibit a rich phase diagram of correlated electron states, including superconductivity and density waves. Recent experiments have indicated the presence of an electronic nematic phase that breaks the rotational symmetry of the lattice below approximately 35 K. Through spectroscopic-imaging scanning tunnelling microscopy, we have demonstrated that this rotational symmetry breaking occurs universally at high temperatures in these materials. We have also observed the formation of coherent unidirectional quasiparticles at lower temperatures, suggesting a different phenomenology compared to high-temperature superconductors.
Article
Multidisciplinary Sciences
Eric Wahlberg, Riccardo Arpaia, Gotz Seibold, Matteo Rossi, Roberto Fumagalli, Edoardo Trabaldo, Nicholas B. Brookes, Lucio Braicovich, Sergio Caprara, Ulf Gran, Giacomo Ghiringhelli, Thilo Bauch, Floriana Lombardi
Summary: The study showed that in highly strained, ultra-thin, underdoped YBa2Cu3O7-delta films, the T-linear resistivity is restored when the CDW amplitude is suppressed, indicating an intimate connection between the onset of CDWs and the departure from T-linear resistivity in underdoped cuprates.
Article
Multidisciplinary Sciences
Qisi Wang, K. von Arx, D. G. Mazzone, S. Mustafi, M. Horio, J. Kuspert, J. Choi, D. Bucher, H. Wo, J. Zhao, W. Zhang, T. C. Asmara, Y. Sassa, M. Mansson, N. B. Christensen, M. Janoschek, T. Kurosawa, N. Momono, M. Oda, M. H. Fischer, T. Schmitt, J. Chang
Summary: A study finds that mild uniaxial pressure can change the ordering pattern of stripes and pin them to the crystal axis. This change may have an impact on superconductivity and could be a key prerequisite for the coexistence of stripes and superconductivity.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Guanghua Liu, Lei Gao, Yi Han, Yao Xiao, Bochao Du, Jianye Gong, Jinlian Hu, Fujin Zhang, He Meng, Xiang Li, Xueliang Shi, Zhe Sun, Jianguo Wang, Gaole Dai, Chunyan Chi, Qing Wang
Summary: A quadrupolar compound Pyr-BA with external doping of two pyrrole-type nitrogen atoms was prepared. Unlike other pi ionic radicals, its cationic radical Pyr-BA·(+) undergoes unusual symmetry-broken charge separation (SB-CS), resulting in the formation of the mixed valence complex Pyr-BA(+1-q)···Pyr-BA(+1+q), where q represents the degree of charge transfer. Experimental analysis and calculations demonstrate the favorable SB-CS behavior of Pyr-BA·(+), which is of significant importance in both fundamental aspects and unexplored material science.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Rui Feng, Hao Wang, Yongyin Cao, Yanxia Zhang, Ray J. H. Ng, You Sin Tan, Fangkui Sun, Cheng-Wei Qiu, Joel K. W. Yang, Weiqiang Ding
Summary: The study demonstrated an all-optical continuously tunable plasmonic pixel scheme through a modular design approach to achieve polarization-controlled full color tuning.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jaewon Choi, Jiemin Li, Abhishek Nag, Jonathan Pelliciari, Hannah Robarts, Charles C. Tam, Andrew Walters, Stefano Agrestini, Mirian Garcia-Fernandez, Dongjoon Song, Hiroshi Eisaki, Steve Johnston, Riccardo Comin, Hong Ding, Ke-Jin Zhou
Summary: This study reveals the spatial symmetry of charge density waves (CDWs) in copper-oxide superconductors using high-resolution resonant inelastic x-ray scattering. The experimental results show anisotropic CDW peaks with elliptical shapes in Bi2Sr2-xLaxCuO6+δ, interpreted as evidence of unidirectional charge stripes. This work provides new insights into the symmetry and microscopic description of CDWs in copper-oxide superconductors.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hercules S. Santana, E. V. L. de Mello
Summary: Recent measurements suggest that cuprates become superconductors through Josephson coupling between nanoscopic charge domains. In CuO planes, incommensurate charge density waves (CDWs) are formed by a series of free-energy wells separated by barriers. Charge oscillations in these domains give rise to hole-hole attraction, leading to localized superconducting amplitudes in the CDW domains.
Article
Materials Science, Multidisciplinary
M. Frachet, Daniel J. Campbell, Anne Missiaen, S. Benhabib, Francis Laliberte, B. Borgnic, T. Loew, J. Porras, S. Nakata, B. Keimer, M. Le Tacon, Cyril Proust, I Paul, David LeBoeuf
Summary: For orthorhombic superconductors, we studied the thermodynamic anisotropy N, defined as the difference in how superconducting T-c varies with in-plane strains, in underdoped YBa2Cu3Oy (YBCO) single crystals. The results showed an intriguing enhancement of thermodynamic anisotropy at intermediate doping levels, which can be attributed to electronic effects. The theoretical analysis suggests that this enhancement is related to the pseudogap potential in the electronic spectrum. The study implies the possibility of strain engineering the pseudogap potential to enhance superconducting T-c.
Article
Materials Science, Multidisciplinary
R. S. Severino, P. D. Mininni, E. Fradkin, V. Bekeris, G. Pasquini, G. S. Lozano
Summary: In this work, we investigated the interaction between superconductivity and nematicity, specifically focusing on how nematicity affects the vortex-vortex interaction. By using the solutions of the time-dependent Ginzburg-Landau equations and implementing a pseudospectral method, we found that there is a competing effect between the superconductor and nematic order parameters, with the competitive or cooperative nature of the nematic order parameter determining the attractive or repulsive nature of the vortex-vortex interaction.
Article
Physics, Multidisciplinary
Bin Hu, Yuhan Ye, Zihao Huang, Xianghe Han, Zhen Zhao, Haitao Yang, Hui Chen, Hong-Jun Gao
Summary: In this study, we systematically investigated the 4a (0) stripe order on the Sb-terminated surface of CsV3Sb5 using low-temperature scanning tunneling microscopy/spectroscopy (STM/S). The results show that the 4a (0) stripe order is visible in a large energy range and exhibits the hallmark of Peierls-type CDW. Additionally, the 4a (0) stripe order remains stable against various external factors at temperatures below 60 K.
Article
Materials Science, Multidisciplinary
Hong-Min Jiang, Ming-Xun Liu, Shun-Li Yu
Summary: Motivated by recent experimental evidence of chiral charge order in vanadium-based kagome superconductors, this theoretical investigation explores the impact of chiral flux charge order on normal and superconducting properties. The study finds that chiral flux charge order partially gaps the spectral weight on the Fermi surface, but preserves spectral weight on certain points, resulting in consistent energy gap patterns. Additionally, the investigation reveals that chiral flux charge order transforms a conventional fully gapped superconducting state into a nodal gap feature, accompanied by changes in density of states. These findings can potentially explain divergent experimental outcomes regarding superconducting pairing symmetry.
Article
Optics
Jinxin Wang, Xu He, Jing Luo, Xiaohui Zhang, Tianxiao Xu
Summary: This paper discusses the issue of pupil-offset off-axis reflective astronomical telescopes with designed tilts and decenters, focusing on the strong coupling of axial and lateral misalignments due to the absence of symmetry. It introduces a method based on modified nodal aberration theory (NAT) to accurately calculate the aberration fields induced by misalignments, taking into account both axial and lateral misalignments. Simulation and actual alignment experiments were conducted to validate the proposed method, demonstrating its feasibility in achieving convergent solution results for different misalignment conditions.
Article
Physics, Multidisciplinary
C. Pepin, H. Freire
Summary: In this paper, the authors present their studies on the phase diagram of cuprate superconductors and propose field-theoretical concepts to explain the properties of these compounds. They introduce the concept of an emergent SU(2) symmetry that rotates between the superconducting and charge order parameters. They also discuss the presence of an emergent U(1) gauge field in the theory and its implications for the pseudogap transition and spectroscopic probes.
Article
Physics, Multidisciplinary
Mingu Kang, Shiang Fang, Jeong-Kyu Kim, Brenden R. Ortiz, Sae Hee Ryu, Jimin Kim, Jonggyu Yoo, Giorgio Sangiovanni, Domenico Di Sante, Byeong-Gyu Park, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Efthimios Kaxiras, Stephen D. Wilson, Jae-Hoon Park, Riccardo Comin
Summary: This study combines angle-resolved photoemission spectroscopy and density functional theory to reveal the presence of multiple kagome-derived van Hove singularities (vHS) in CsV3Sb5 and their contribution to electronic symmetry breaking. These vHS critically determine the pairing symmetry and unconventional ground states emerging in the AV(3)Sb(5) series.
Article
Optics
Kahraman Keskinbora, Abraham Levitan, Riccardo Comin
Summary: Fourier transform holography is a lensless imaging technique that retrieves an object's exit-wave function with high fidelity, and it has been used to study nanoscale phenomena and phase components in solids. However, the traditional method requires complex masking for interference, while our proposed method uses wavefront-shaping diffractive optics to create structured probes, avoiding the use of masks, and has been validated through experiments.
Article
Optics
Zhen Guo, Abraham Levitan, George Barbastathis, Riccardo Comin
Summary: This study introduces a new method called deep k-learning for reconstructing phase objects from RPI data, which significantly improves results and shows advantages in computational efficiency and robustness against noise.
Review
Physics, Multidisciplinary
Jiarui Li, Shriram Ramanathan, Riccardo Comin
Summary: Rare earth nickelate perovskites have emerged as an important platform for quantum matter physics and advanced applications. Carrier doping has been proven to be a powerful tuning parameter for the properties of these compounds, allowing for reversible changes in their electronic and magnetic properties. This review discusses the recent advancements in electron-doped rare earth nickelates and their potential applications in sensing and neuromorphic computation.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Luiz G. Pimenta Martins, Bruno R. Carvalho, Connor A. Occhialini, Natalia P. Neme, Ji-Hoon Park, Qian Song, Pedro Venezuela, Mario S. C. Mazzoni, Matheus J. S. Matos, Jing Kong, Riccardo Comin
Summary: Transition metal dichalcogenides exhibit interesting physical phenomena, but the multivalley effects are hindered in monolayers. By using high pressure, the electronic properties of monolayer MoS2 and WSe2 can be tuned, enabling sensitive probing of multivalley phenomena.
Article
Multidisciplinary Sciences
Qian Song, Connor A. Occhialini, Emre Ergecen, Batyr Ilyas, Danila Amoroso, Paolo Barone, Jesse Kapeghian, Kenji Watanabe, Takashi Taniguchi, Antia S. Botana, Silvia Picozzi, Nuh Gedik, Riccardo Comin
Summary: This article reports the discovery of type-II multiferroic order in a single atomic layer of the transition-metal-based van der Waals material NiI2. The multiferroic state of NiI2 is characterized by a proper-screw spin helix that induces chirality-controlled electrical polarization. Through various optical measurements and theoretical simulations, it is found that NiI2 has a highly anisotropic electronic state that breaks both rotational and inversion symmetry, supporting polar order. Interestingly, the ordered magnetic polar state persists down to the monolayer level of NiI2. These findings introduce a new platform for studying emergent multiferroic phenomena, chiral magnetic textures, and ferroelectricity in the realm of two-dimensional van der Waals materials.
Article
Optics
Abraham Levitan, Riccardo Comin
Summary: This paper introduces a lensless imaging method for partially coherent wave fields and proposes metrics for comparing partially coherent light fields, filling a gap in the existing literature and enabling the assessment of reliability and resolution of reconstructed wave fields.
Article
Multidisciplinary Sciences
S. Wandel, F. Boschini, E. H. da Silva Neto, L. Shen, M. X. Na, S. Zohar, Y. Wang, S. B. Welch, M. H. Seaberg, J. D. Koralek, G. L. Dakovski, W. Hettel, M-F Lin, S. P. Moeller, W. F. Schlotter, A. H. Reid, M. P. Minitti, T. Boyle, F. He, R. Sutarto, R. Liang, D. Bonn, W. Hardy, R. A. Kaindl, D. G. Hawthorn, J-S Lee, A. F. Kemper, A. Damascelli, C. Giannetti, J. J. Turner, G. Coslovich
Summary: In this study, the transient evolution of charge density wave (CDW) correlations in cuprate superconductors after the quench of superconductivity was tracked using ultrafast resonant soft x-ray scattering. The results showed a nonthermal response of CDW order characterized by a doubling of the correlation length within approximately 1 picosecond of the superconducting quench. These findings suggest that the interaction between superconductivity and CDWs manifests inhomogeneously through disruption of spatial coherence.
Article
Materials Science, Multidisciplinary
D. J. Campbell, B. Wilfong, M. P. Zic, G. Levy, M. X. Na, T. M. Pedersen, S. Gorovikov, P. Y. Zavalij, S. Zhdanovich, A. Damascelli, E. E. Rodriguez, J. Paglione
Summary: This study presents a method for producing high quality KCo2As2 crystals and tests their properties. The experiments confirm the high quality and low impurity scattering of the crystals, and the absence of long range magnetic order. The compound exhibits unusual band dispersions and linear magnetoresistance.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Mingu Kang, Shiang Fang, Jonggyu Yoo, Brenden R. Ortiz, Yuzki M. Oey, Jonghyeok Choi, Sae Hee Ryu, Jimin Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Efthimios Kaxiras, Joseph G. Checkelsky, Stephen D. Wilson, Jae-Hoon Park, Riccardo Comin
Summary: The authors use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order in AV(3)Sb(5) (A = K, Rb, Cs) and its interplay with superconductivity. The observed difference in charge order structure between CsV3Sb5 and the other compounds potentially explains the double-dome superconductivity in CsV3(Sb,Sn)(5) and the suppression of T-c in KV3Sb5 and RbV3Sb5. These findings provide fresh insights into the phase diagram of AV(3)Sb(5).
Article
Acoustics
L. Foglia, R. Mincigrucci, A. A. Maznev, G. Baldi, F. Capotondi, F. Caporaletti, R. Comin, D. De Angelis, R. A. Duncan, D. Fainozzi, G. Kurdi, J. Li, A. Martinelli, C. Masciovecchio, G. Monaco, A. Milloch, K. A. Nelson, C. A. Occhialini, M. Pancaldi, E. Pedersoli, J. S. Pelli-Cresi, A. Simoncig, F. Travasso, B. Wehinger, M. Zanatta, F. Bencivenga
Summary: Collective lattice dynamics play a critical role in determining the properties of condensed matter. The extreme ultraviolet transient grating (EUV TG) approach allows access to a previously inaccessible length-scale, providing valuable insights into the thermoelastic properties of matter. This technique has significant implications for fundamental physics and future technology development.
Article
Chemistry, Physical
Connor A. Occhialini, Joshua J. Sanchez, Qian Song, Gilberto Fabbris, Yongseong Choi, Jong-Woo Kim, Philip J. Ryan, Riccardo Comin
Summary: The origin of nematicity in FeSe is studied using X-ray linear dichroism and X-ray diffraction measurements. It is found that spontaneous orbital polarization serves as the primary order parameter of the nematic phase, providing strong evidence for an orbital mechanism driving nematicity.
Article
Multidisciplinary Sciences
Kohei Matsuura, Masaki Roppongi, Mingwei Qiu, Qi Sheng, Yipeng Cai, Kohtaro Yamakawa, Zurab Guguchia, Ryan P. Day, Kenji M. Kojima, Andrea Damascelli, Yuichi Sugimura, Mikihiko Saito, Takaaki Takenaka, Kota Ishihara, Yuta Mizukami, Kenichiro Hashimoto, Yilun Gu, Shengli Guo, Licheng Fu, Zheneng Zhang, Fanlong Ning, Guoqiang Zhao, Guangyang Dai, Changqing Jin, James W. Beare, Graeme M. Luke, Yasutomo J. Uemura, Takasada Shibauchi
Summary: Iron-chalcogenide superconductors FeSe1-xSx have unique electronic properties and the nature of superconductivity with nematicity is important for understanding unconventional superconductivity. Recent experiments show that the superconducting state in FeSe1-xSx breaks time-reversal symmetry and exhibits ultranodal pair state. The presence of broken TRS and suppressed superfluid density suggests the existence of two different superconducting states separated by the nematic critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Review
Physics, Applied
Luiz G. Pimenta G. Martins, Riccardo Comin, Matheus J. S. Matos, Mario S. C. Mazzoni, Bernardo R. A. Neves, Matthew Yankowitz
Summary: Two-dimensional (2D) materials and their moire superlattices have unique properties due to their reduced dimensionality and tunability, making them a new frontier in quantum matter research. However, high-pressure studies of these materials have been underexplored, offering exciting opportunities for discovering new phenomena. This review discusses ongoing efforts to study atomically thin van der Waals (vdW) materials and heterostructures using high-pressure techniques and addresses challenges such as substrate influence and pressure modeling.
APPLIED PHYSICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Shiang Fang, Linda Ye, Madhav Prasad Ghimire, Mingu Kang, Junwei Liu, Minyong Han, Liang Fu, Manuel Richter, Jeroen van den Brink, Efthimios Kaxiras, Riccardo Comin, Joseph G. Checkelsky
Summary: In this study, we investigated the electronic structure of the ferromagnetic kagome metal Fe3Sn2 without spin-orbit coupling. We found two energetically split helical nodal lines near K and K' in the Brillouin zone, resulting from the trigonal stacking of the kagome layers. The hopping across A-A stacking introduced energy splitting, while that across A-B stacking controlled the momentum space amplitude of the helical nodal lines. Our findings have important implications for the design of topological materials.
