Article
Materials Science, Multidisciplinary
J. Ding, L. Li, N. Wang, L. Tian, M. Asta, R. O. Ritchie, T. Egami
Summary: This study investigates the local structural evolutions in the beta relaxation process of metallic glasses through atomistic simulations, revealing universal melt-like features in the saddle states of the PEL. The short-lived local melting at the saddle point is found to wipe out prior thermal history, providing an explanation for the decoupling of activation and relaxation stages in the b process. These findings emphasize the importance of understanding the nature of saddle states in elucidating system dynamics and raise questions about the current view on system evolution in the PEL.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Hiroshi Mizoguchi, Sang-Won Park, Takayoshi Katase, Grigori V. Vazhenin, Junghwan Kim, Hideo Hosono
Summary: This study found that the anti-ReO3-type compound Na3N exhibits metallic nature due to the presence of a crystallographic cavity causing the collapse of the bandgap and the formation of a wide Na 3s conduction band. Na3N is a unique nitride with an electronically active cavity space.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Physics, Multidisciplinary
Song Bao, Wei Wang, Yanyan Shangguan, Zhengwei Cai, Zhao-Yang Dong, Zhentao Huang, Wenda Si, Zhen Ma, Ryoichi Kajimoto, Kazuhiko Ikeuchi, Shin-ichiro Yano, Shun-Li Yu, Xiangang Wan, Jian-Xin Li, Jinsheng Wen
Summary: In this research, the coexistence and interplay between local moments and itinerant electrons in the metallic ferromagnet Fe2.72GeTe2 were studied using inelastic neutron scattering. Spectroscopic evidence was provided, and the Kondo effect between local moments and itinerant electrons was revealed. These findings have significant implications for understanding magnetism in transition-metal compounds.
Article
Chemistry, Multidisciplinary
Alexandra Mavridi-Printezi, Stefano Giordani, Arianna Menichetti, Dario Mordini, Andrea Zattoni, Barbara Roda, Lucia Ferrazzano, Pierluigi Reschiglian, Valentina Marassi, Marco Montalti
Summary: Melanin-inspired nanomaterials synthesized through the oxidative polymerization of dopamine exhibit simultaneous formation of multiple nanosized species with different compositions, morphologies, and properties. Chromatographic techniques and other analytical methods were used to separate and characterize the two populations, revealing distinct chemical, physical, optical, and electronic properties.
Article
Chemistry, Physical
Marios Hadjimichael, Yaqi Li, Edoardo Zatterin, Gilbert A. Chahine, Michele Conroy, Kalani Moore, Eoghan N. O' Connell, Petr Ondrejkovic, Pavel Marton, Jiri Hlinka, Ursel Bangert, Steven Leake, Pavlo Zubko
Summary: Multiple boundary conditions can be manipulated simultaneously in nanoscale heterostructures to stabilize unusual structures and emergent phases. In PbTiO3-SrRuO3 ferroelectric-metal superlattices, a stable supercrystal phase with a three-dimensional ordering of nanoscale domains can be engineered. The complex hierarchical domain structure formed in this system minimizes elastic and electrostatic energy, with large local deformations of the ferroelectric lattice accommodated by periodic lattice modulations of metallic layers.
Article
Cell Biology
Alan Tartakoff, Patrick DiMario, Eduard Hurt, Brian McStay, Vikram Govind Panse, David Tollervey
Summary: The nucleolus is a highly ordered assembly line for producing ribosomal subunits, and the assembly factors in the nucleolus undergo cycling between operative and latent states.
GENES & DEVELOPMENT
(2022)
Article
Materials Science, Multidisciplinary
Leo Zella, Jaeyun Moon, David Keffer, Takeshi Egami
Summary: Metallic glasses exhibit fast mechanical relaxations known as nearly constant loss (NCL) at temperatures below the glass transition. Through molecular dynamics simulations, it is found that NCL relaxation is due to transient groups of atoms that revert to typical atomic-level viscoelastic behavior. These groups of atoms are homogeneously distributed throughout the glass, without any outstanding features.
Article
Chemistry, Physical
Gaoshang Gong, Jin Zhou, Yaran Duan, Huiyun Hu, Yongqiang Wang, Xuerui Cheng, Yuling Su
Summary: The study reveals that one-dimensional frustrated material Ca3CoMnO6 exhibits weak relaxor ferroelectric behavior and the presence of polar nanoregions, which results in the suppressed macroscopic ferroelectric polarization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Physical
Wenshuo Xu, Yuxuan Ke, Zhuo Wang, Wenjing Zhang, Andrew Thye Shen Wee
Summary: This article provides a comprehensive overview of metallic two-dimensional materials and the key factors that dictate their structures and properties. The phase transitions induced by structural or electronic modifications, as well as the influences of lattice defects, dopants, and intercalated species between adjacent layers, are examined using microscopic imaging, spectral characterization, and electrical measurements. The discussion on heterostructures involving highly conductive 2D components and potential new applications like radio-frequency antennas and electromagnetic interference shields offer insights into the future development of these materials.
SURFACE SCIENCE REPORTS
(2021)
Article
Multidisciplinary Sciences
Wenda Yang, Guo Tian, Yang Zhang, Fei Xue, Dongfeng Zheng, Luyong Zhang, Yadong Wang, Chao Chen, Zhen Fan, Zhipeng Hou, Deyang Chen, Jinwei Gao, Min Zeng, Minghui Qin, Long-Qing Chen, Xingsen Gao, Jun-Ming Liu
Summary: This study demonstrates the presence of conductive metallic conduction channels in ferroelectric topological defects, specifically in vortex and center cores. These channels exhibit high conductivity and can be controlled by manipulating the topological states.
NATURE COMMUNICATIONS
(2021)
Review
Engineering, Mechanical
M. M. Khonsari, Sahar Ghatrehsamani, Saleh Akbarzadeh
Summary: The running-in process of mechanical elements is a transient process involving complex interactions between friction, lubrication, wear, and other factors, which gradually evolves key tribological parameters to establish a stable state. The steady-state behavior of friction components depends on the operating conditions during the running-in process. This paper reviews the literature on this subject comprehensively, covering both experimental and analytical developments.
Review
Chemistry, Analytical
Adrian Golebiowski, Boguslaw Buszewski
Summary: The work discusses the application of analytical techniques to characterize biological and metallic colloidal species. Various techniques are used to determine particle size distributions, molar mass, zeta-potential, and chemical speciation. These physicochemical properties are crucial in understanding colloid stabilization phenomena and their interactions with other compounds.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Michael Hoffmann, Mengcheng Gui, Stefan Slesazeck, Riccardo Fontanini, Mattia Segatto, David Esseni, Thomas Mikolajick
Summary: Utilizing ferroelectric negative capacitance in Hf0.5Zr0.5O2-based thin films shows great promise for nanoscale electronic devices. Investigating heterostructures reveals that the negative capacitance is intrinsic to the Hf0.5Zr0.5O2 layer, which is crucial for potential applications. Energy barrier for polarization switching in Hf0.5Zr0.5O2 is found to be independent of domain configuration and layer thickness, in agreement with first principles calculations.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jiaqi Wang, Yu Ma, Zujian Wang, Xitao Liu, Shiguo Han, Yi Liu, Wuqian Guo, Junhua Luo, Zhihua Sun
Summary: In this study, we achieved control and tuning of birefringence in a 2D hybrid perovskite ferroelectric material by manipulating its structure and ferroelectric properties. The birefringence of the material can be reversibly switched through symmetry breaking and modulation of ferroelectricity. This research opens up new possibilities for modulating the nonlinear optical properties of smart devices.
Article
Multidisciplinary Sciences
Pavan Nukala, Majid Ahmadi, Yingfen Wei, Sytze de Graaf, Evgenios Stylianidis, Tuhin Chakrabortty, Sylvia Matzen, Henny W. Zandbergen, Alexander Bjorling, Dan Mannix, Dina Carbone, Bart Kooi, Beatriz Noheda
Summary: This study found that ferroelectricity in hafnia-based thin films is closely related to oxygen voltammetry, as reversible oxygen vacancy migration is observed when the top electrode is oxygen reactive, with electrodes serving as sources and sinks of oxygen, and the dielectric layer acting as a fast conduit at millisecond time scales.
Article
Optics
Matteo Secli, Tomoki Ozawa, Massimo Capone, Iacopo Carusotto
Summary: In this study, a semiclassical theory of laser oscillation in a chiral edge state of a topological photonic system with frequency-dependent gain is developed. By considering a Harper-Hofstadter lattice embedding two-level atoms as a gain material, the researchers demonstrate a flexible mode-selection mechanism that can stabilize single-mode lasing into an edge state. The implications of these results for recent experiments are outlined.
Article
Spectroscopy
Laura Fanfarillo, Damir Kopic, Andrea Sterzi, Giulia Manzoni, Alberto Crepaldi, Daniel T. Payne, Wibke Bronsch, Vladimir Tsurkan, Dorina Croitori, Joachim Deisenhofer, Fulvio Parmigiani, Massimo Capone, Federico Cilento
Summary: By studying FeSe0.4Te0.6 compound with tr-ARPES, it was found that a long-lived state may be induced under light excitation, shedding new light on the nematic symmetry breaking in iron-based superconductors. This challenges the common belief that low-energy coupling with fluctuations is necessary for stabilizing the nematic order, suggesting that the Hund's coupling-induced orbital differentiation could be the driving force behind the nematic order in these superconductors.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2021)
Article
Physics, Multidisciplinary
Matteo Secli, Massimo Capone, Marco Schiro
Summary: We investigate the signatures of a self-trapping transition in a driven-dissipative Bose Hubbard dimer with incoherent pump and single-particle losses. The study focuses on the quantum dynamics of particle imbalance and frequency-resolved spectral properties of the steady state, showing clear evidence of a localization-delocalization crossover. A finite pump-loss asymmetry restores a delocalization crossover in the imbalance and leads to finite intra-dimer dissipation.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Condensed Matter
Andrea Richaud, Matteo Ferraretto, Massimo Capone
Summary: The physics of multiorbital Hubbard models, which can be observed in many correlated materials, can be simulated using the available SU(N)-symmetric ultracold atom platforms, by utilizing the internal degrees of freedom of multicomponent atoms.
Article
Computer Science, Interdisciplinary Applications
A. Amaricci, L. Crippa, A. Scazzola, F. Petocchi, G. Mazza, L. de Medici, M. Capone
Summary: EDIpack is an exact diagonalization package for solving generic quantum impurity problems, enabling massively parallel computations. Optimizing inter-processors communication and achieving sub-linear scaling are crucial for handling large systems.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Condensed Matter
Maria Florencia Ludovico, Massimo Capone
Summary: In this study, we investigate the dynamics of charge and energy currents in a Coulomb-coupled double quantum dot system. We find that the currents induced by inter-dot electron friction in the undriven dot are of similar magnitude to those generated in the adiabatically driven dot. Interestingly, up to 43% of the energy injected by the ac sources can be transferred from the driven dot to the undriven one.
EUROPEAN PHYSICAL JOURNAL B
(2022)
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
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
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
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
Optics
Matteo Secli, Massimo Capone, Marco Schiro
Summary: In this study, we investigate a driven-dissipative Bose-Hubbard model with two-particle losses and a single-particle drive on each lattice site. By employing dynamical meanfield theory (DMFT) and an impurity solver based on exact diagonalization, we explore the regime of strong two-particle losses. We observe the emergence of a stationary-state quantum Zeno effect, which is captured by DMFT through its self-consistent bath. In the deep Zeno regime, the bath structure simplifies and an effective dissipative hard-core Bose-Hubbard dimer model emerges.
Article
Materials Science, Multidisciplinary
L. Crippa, A. Amaricci, S. Adler, G. Sangiovanni, M. Capone
Summary: The impact of Coulomb interaction on the electronic properties of a quantum spin Hall insulator has been studied using quantum cluster methods, with a focus on disentangling local from nonlocal effects. Different regimes have been identified based on the value of the bare mass term, with significant differences in self-energy contributions. The study shows that for small mass, nonlocal correlations become important and eventually dominate over local ones near the zero-mass semimetallic line, while for intermediate and large mass, local correlation effects outweigh nonlocal corrections, leading to a first-order topological phase transition.
Article
Materials Science, Multidisciplinary
Giacomo Mazza, Adriano Amaricci, Massimo Capone
Summary: Heterostructures formed by stacking layers of two s-wave superconductors with different coupling strengths show enhanced superconducting critical temperature, with two distinct physical regimes identified based on the thickness of the larger layer.
Article
Materials Science, Multidisciplinary
Martino Stefanini, Massimo Capone, Alessandro Silva
Summary: The study focuses on the motion of an impurity in a two-leg ladder interacting with fermionic baths along each leg, bridging cold atom quantum simulators with an idealized description of transport processes in a layered heterostructure. Exact analytical results for the single-particle Green's function are obtained using the linked-cluster expansion, revealing that the long-time behavior is dominated by an intrinsic orthogonality catastrophe. Differences between intra- and interleg Green's functions are not significant in the long-time limit, but a subleading correction observed in the case of legs with different interaction strengths may be relevant for intermediate-time transport at material interfaces.
