Article
Nanoscience & Nanotechnology
L. Hu, X. B. Zhu, Y. P. Sun
Summary: This Perspective provides a brief overview of strongly correlated antiferromagnetic vanadates, including the basic concepts of antiferromagnetism and vanadates, and the antiferromagnetism in vanadates with different spin moments. The article summarizes the magnetism in vanadates and provides an outlook for future research.
Article
Physics, Fluids & Plasmas
Jie Ren, Zhao Wang, Weixia Chen, Wen-Long You
Summary: In this study, we investigate quantum phase transitions in Heisenberg antiferromagnetic chains with staggered power-law decaying long-range interactions. By using the density-matrix renormalization group (DMRG) algorithm and the fidelity susceptibility as the criticality measure, we obtain more accurate values of quantum critical points compared to previous studies. Furthermore, we explore the effects of anisotropic long-range interactions and symmetry breaking, which result in the emergence of various quantum phases.
Article
Materials Science, Multidisciplinary
Motoharu Kitatani, Ryotaro Arita, Thomas Schaefer, Karsten Held
Summary: We review recent studies on superconductivity using diagrammatic extensions of dynamical mean field theory, which consider both local correlation effects and spatial long-range fluctuations. The results reproduce and predict experimental phase diagrams of strongly correlated systems, and reveal that the dynamical screening effect of the pairing interaction vertex has significant consequences for the transition temperature.
JOURNAL OF PHYSICS-MATERIALS
(2022)
Article
Physics, Multidisciplinary
Bidesh Biswas, Sourav Rudra, Rahul Singh Rawat, Nidhi Pandey, Shashidhara Acharya, Anjana Joseph, Ashalatha Indiradevi Kamalasanan Pillai, Manisha Bansal, Muireann de h-Ora, Debendra Prasad Panda, Arka Bikash Dey, Florian Bertram, Chandrabhas Narayana, Judith MacManus-Driscoll, Tuhin Maity, Magnus Garbrecht, Bivas Saha
Summary: In this study, we demonstrated the existence of a magnetic stress-driven metal-insulator transition in Chromium Nitride. Through structural, magnetic, and electronic transport characterization, as well as first-principles modeling analysis, we found that the phase transition temperature in CrN is directly proportional to the strain-controlled anisotropic magnetic stress. Compressive strain increases the magnetic stress, leading to a room-temperature transition. In contrast, tensile strain and the inclusion of nonmagnetic cations weaken the magnetic stress and reduce the transition temperature. This discovery unifies spin, charge, and lattice degrees of freedom in correlated materials and holds potential for novel device functionalities.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Liguo Ma, Phuong X. Nguyen, Zefang Wang, Yongxin Zeng, Kenji Watanabe, Takashi Taniguchi, Allan H. MacDonald, Kin Fai Mak, Jie Shan
Summary: This study demonstrates a strongly correlated two-dimensional excitonic insulator ground state in transition metal dichalcogenide semiconductor double layers, providing direct thermodynamic evidence for the state. Capacitance measurements show that the exciton fluid is compressible but charge-incompressible. An exciton phase diagram reveals both the Mott transition and interaction-stabilized quasi-condensation.
Article
Materials Science, Multidisciplinary
Yu. S. Orlov, S. V. Nikolaev, S. Ph. Tegai, N. N. Paklin, S. G. Ovchinnikov
Summary: The effects of exciton Bose condensation in strongly correlated spin crossover systems are investigated in this study. The spectrum of collective excitations is calculated at different points of the temperature-crystal field phase diagram, and the role of electron-phonon interaction is discussed. A novel mechanism of excitonic and magnetic order photoenhancement based on the appearance of massive collective phase mode is demonstrated. Furthermore, it is shown that exciton and associated magnetic ordering can be photoinduced outside the exciton condensate phase.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
K. Miura, D. Kiriya, T. Yoshimura, N. Fujimura
Summary: In this study, the electron excitation mechanism and spin accompanied by electron transition in a multiferroic YMnO3 epitaxial thin film were investigated using photoluminescence (PL) spectroscopy. The key finding was that the intensities of the PL band at 1.43 eV increase as the excitation energy approaches the absorption peak energy corresponding to the on-site Coulomb energy and as the temperature decreases below 80 K, corresponding to the Neel temperature. These results suggest that the PL band is mediated by the spin-flip and relaxation processes.
Article
Multidisciplinary Sciences
Shubhankar Das, A. Ross, X. X. Ma, S. Becker, C. Schmitt, F. van Duijn, E. F. Galindez-Ruales, F. Fuhrmann, M-A Syskaki, U. Ebels, V Baltz, A-L Barra, H. Y. Chen, G. Jakob, S. X. Cao, J. Sinova, O. Gomonay, R. Lebrun, M. Klaui
Summary: The research shows that there is a mechanism for long-distance spin transport in the antiferromagnetic orthoferrite YFeO3, with a magnon decay length exceeding hundreds of nanometers and low magnetic damping. The strong anisotropy in magnon decay lengths is attributed to the role of magnon group velocity in the transport of spin-waves.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Youngjae Kim
Summary: We used time-resolved transient absorption spectroscopy to investigate the ultrafast optical responses of condensed matter systems. We observed unconventional absorption spectra in Mott insulators that do not fully reflect the dynamical Franz-Keldysh effect, unlike in band insulators. These unconventional spectra, characterized by a negative difference absorption and a blueshift, are purely driven by electron correlations, as revealed by decomposed calculation.
Article
Multidisciplinary Sciences
Panagiota Perlepe, Itziar Oyarzabal, Laura Voigt, Mariusz Kubus, Daniel N. Woodruff, Sebastian E. Reyes-Lillo, Michael L. Aubrey, Philippe Negrier, Mathieu Rouzieres, Fabrice Wilhelm, Andrei Rogalev, Jeffrey B. Neaton, Jeffrey R. Long, Corine Mathoniere, Baptiste Vignolle, Kasper S. Pedersen, Rodolphe Clerac
Summary: The electronic synergy between metal ions and organic linkers is essential for engineering molecule-based materials with high electrical conductivity and metallicity. This study demonstrates the crucial role of metal ions in tuning the electronic properties of such materials, leading to high room-temperature conductivity and the existence of a correlated metal state.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Han Gao, Chao Ding, Jaeseok Son, Yangyu Zhu, Mingzheng Wang, Zhi Gen Yu, Jianing Chen, Le Wang, Scott A. Chambers, Tae Won Noh, Mingwen Zhao, Yangyang Li
Summary: This article introduces the existence of flat plasmons in strongly correlated systems and showcases the characteristics and potential applications of these flat plasmons using alpha-Ti2O3 as an example.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Luhang Yang, Phillip Weinberg, Adrian E. Feiguin
Summary: In this study, we investigated the properties of a generalized quantum spin ladder model with staggered long range interactions. Our results show that this model undergoes a transition from a rung-dimer phase characterized by a non-local string order parameter to a symmetry broken Neel phase, and this transition is second order.
Article
Chemistry, Inorganic & Nuclear
Alisher F. Murtazoev, Peter S. Berdonosov, Konstantin A. Lyssenko, Valery A. Dolgikh, Zlata V. Pchelkina, Konstantin V. Zakharov, Michael Y. Geidorf, Tatyana M. Vasilchikova, Olga S. Volkova, Alexander N. Vasiliev
Summary: Anhydrous copper tellurite sulfate, Cu3TeO3(SO4)(2), was synthesized via vapor transport reactions in sealed silica glass ampoules. Various measurements revealed long-range antiferromagnetic order at T-N = 13 K and established an H-T magnetic phase diagram. Density functional theory calculations provided estimations of leading exchange interaction parameters.
DALTON TRANSACTIONS
(2023)
Editorial Material
Physics, Multidisciplinary
Susan Kempinger
Summary: Advancements in precision lithography and measurement have enabled the observation and control of magnetic phase transition in kagome artificial spin ice, potentially leading to the development of new technological devices.
Article
Materials Science, Multidisciplinary
A. Shchepetilnikov, A. R. Khisameeva, Yu A. Nefyodov, I. Kukushkin
Summary: The study investigates the spin relaxation of a strongly correlated electron system in a narrow AlAs quantum well near odd fillings of the integer quantum Hall effect. Results show that increasing tilt angle in the magnetic field leads to a significant decrease in relaxation time and alters the dependence of relaxation rate on filling factor at highest tilt angles. The observed effects are attributed to the renormalization of spin excitation spectra by strong electron-electron interactions.
Article
Computer Science, Interdisciplinary Applications
Josef Kaufmann, Karsten Held
Summary: This article presents the Python package ana_cont, which is used for the analytic continuation of fermionic and bosonic many-body Green's functions using either the Pade approximants method or the maximum entropy method. The determination of hyperparameters and the implementation are described in detail. The code is publicly available on GitHub, where documentation and learning resources are also provided.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Maria Chatzieleftheriou, Alexander Kowalski, Maja Berovic, Adriano Amaricci, Massimo Capone, Lorenzo De Leo, Giorgio Sangiovanni, Luca de Medici
Summary: We demonstrate the existence of a finite-doping quantum critical point (QCP) arising from a first-order Mott transition in the phase diagram of a strongly correlated material. By tuning the chemical potential, we find that the Mott transition evolves into a first-order transition between two metals, leading to a phase separation region ending in the finite-doping QCP. This scenario, demonstrated using a minimal multiorbital Hubbard model, has implications beyond iron-based superconductors and shows a strong analogy with cuprate superconductors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Bastien Michon, Christophe Berthod, Carl Willem Rischau, Amirreza Ataei, Lu Chen, Seiki Komiya, Shimpei Ono, Louis Taillefer, Dirk van der Marel, Antoine Georges
Summary: In this paper, researchers experimentally demonstrated the universal scaling properties of resistivity, optical conductivity, and optical effective mass of La2-xSrxCuO4 as a function of frequency and temperature. They also proposed a new theoretical framework to describe the unique properties of quantum critical matter.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Erik G. C. P. van Loon, Malte Schueler, Daniel Springer, Giorgio Sangiovanni, Jan M. M. Tomczak, Tim O. O. Wehling
Summary: Two-dimensional materials are influenced by their surroundings, and manipulating the dielectric screening can directly control the insulating state of Mott materials. Many-body calculations show spectroscopic changes and an insulator-to-metal transition through Coulomb engineering. We discuss the experimental conditions for achieving Coulomb engineering of Mott materials based on our proof-of-principle calculations.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Optics
Andrea Richaud, Giacomo Lamporesi, Massimo Capone, Alessio Recati
Summary: Quantum vortices with effective inertial mass, introduced by massive particles in their cores, exhibit new phenomena beyond the standard picture of massless superfluid vortex dynamics. In this study, we propose a scheme to generate controllable and repeatable collisional events between massive vortices. We demonstrate two mass-driven fundamental processes: the annihilation of two counter-rotating vortices and the merging of two co-rotating vortices. This reveals new mechanisms for incompressible-to-compressible kinetic-energy conversion and the stabilization of doubly quantized vortices in flat superfluids.
Article
Materials Science, Multidisciplinary
Martino Stefanini, Massimo Capone, Alessandro Silva
Summary: In this study, a model for the motion of an impurity interacting with two Tomonaga-Luttinger liquid systems is considered. A perturbative expression for the system's evolution is provided when the impurity is injected into one of the baths with a given wave packet. The dynamics of the impurity and its effect on the baths, as well as the dynamics of the bath density and momentum density, are analyzed. The correlation between the baths is also quantified, revealing a complex pattern containing information on both the impurity motion and the baths.
Article
Materials Science, Multidisciplinary
Patrick Kappl, Friedrich Krien, Clemens Watzenboeck, Karsten Held
Summary: By calculating the three-particle response of the Anderson impurity model, we find that genuine three-particle vertex corrections are significant and cannot be neglected by only considering bare bubble terms or corrections based on the two-particle vertex.
Article
Materials Science, Multidisciplinary
Liang Si, Paul Worm, Dachuan Chen, Karsten Held
Summary: Despite extensive experimental and theoretical efforts, understanding the magnetic and electronic properties of superconducting nickelates remains challenging due to hidden factors in the synthesized films. One possible hidden factor is the intercalation of hydrogen during the chemical reduction process. The formation of hydrogen chains in LaNiO2 superconductors may explain the observed charge order states and make synthesizing homogeneous nickelates more difficult.
Article
Materials Science, Multidisciplinary
A. Amaricci, G. Mazza, M. Capone, M. Fabrizio
Summary: Time-reversal symmetric topological insulators are generally stable against weak local interaction unless symmetry-breaking transitions occur. Using dynamical mean-field theory, we study an interacting model of quantum spin Hall insulators and find a first-order symmetry-breaking transition to a nontopological insulator with exciton condensation at intermediate coupling. With stronger interaction, the insulator becomes a Mott insulator. The transition is continuous in the absence of magnetic order and progresses through Mott localization before the condensate coherence is lost. We demonstrate that the correlated excitonic state corresponds to a magneto-electric insulator, which can be experimentally probed. Lastly, we discuss the fate of helical edge modes across the excitonic transition.
Article
Materials Science, Multidisciplinary
Philipp Eck, Yuan Fang, Domenico Di Sante, Giorgio Sangiovanni, Jennifer Cano
Summary: We propose a method to realize an electronic two-dimensional (2D) higher order topological insulator (HOTI) on a triangular lattice, which can be achieved in a wide range of materials. The crucial factor is the breaking of mirror symmetry, which leads to a finite quadrupole moment and trivial Z2 index. The interplay between spin-orbit coupling and symmetry-breaking terms results in four topologically distinct phases, and the HOTI phase appears when symmetry breaking dominates, even in the absence of spin-orbit coupling. We identify triangular monolayer adsorbate systems on the (111) surface of zincblende/diamond type substrates as ideal material platforms, and predict the HOTI phase for X = (Al, B, Ga) on SiC.
Article
Materials Science, Multidisciplinary
Ruiqi Ku, Luo Yan, Jian-Guo Si, Songyuan Zhu, Bao-Tian Wang, Yadong Wei, Kaijuan Pang, Weiqi Li, Liujiang Zhou
Summary: Based on first principles, this study investigates the Janus 2H-MoSH monolayer and reports the global minimum structure of a Janus 1T-MoSH monolayer. The 2H-MoSH monolayer can easily transform into the 1T phase with a small barrier. The Janus 1T-MoSH is a charge-density wave (CDW) material whose CDW order can be regulated through external strains. Under 3% compressive strain, the CDW in Janus 1T-MoSH is suppressed and a superconducting state with a transition temperature of 25.15 K emerges. The Janus 2H-MoSH monolayer is an intrinsic superconductor with a transition temperature of 26.81 K, which can be enhanced to 36.69 K under 1% tensile strain.
Article
Materials Science, Multidisciplinary
Laura Fanfarillo, Angelo Valli, Massimo Capone
Summary: We demonstrate that the experimental manifestations of nematic order in iron-based superconductors are intrinsically related to electronic correlations in the Hund's correlated metallic state, and cannot be explained using a renormalized quasiparticle picture. Specifically, we find that (i) in a metal where correlations are dominated by the Hund's coupling, nematic ordering does not result in a rigid energy shift in the photoemission spectra, but rather a more complex spectral weight redistribution that reflects the experimental observations, and (ii) the nematic ordering exhibits orbital-selective coherence induced by Hund's physics, consistent with experimental observations.
Article
Physics, Multidisciplinary
Domenico Di Sante, Bongjae Kim, Werner Hanke, Tim Wehling, Cesare Franchini, Ronny Thomale, Giorgio Sangiovanni
Summary: We investigate the real-space profile of effective Coulomb interactions in correlated kagome materials and find that all kagome metals exhibit a universal long-range Coulomb behavior. Our results indicate that the on-site interaction strength in kagome metals depends not only on the screening processes at high energy, but also on the low-energy hybridization profile of the electronic density of states.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Simone Di Cataldo, Paul Worm, Liang Si, Karsten Held
Summary: A recent experiment suggests that superconductivity in nickelates is limited to a specific range of hydrogen concentration. The necessity of hydrogen indicates its crucial role in superconductivity. However, calculations using density-functional theory show that the electron-phonon coupling in hydrogen-intercalated nickelates is not strong enough to explain the observed superconductivity.
