Article
Materials Science, Multidisciplinary
Jie Liu, Carlo Danieli, Jianxin Zhong, Rudolf A. Roemer
Summary: In the three-dimensional generalized Lieb models, uncorrelated disorder destroys the macroscopic degeneracy of the flat bands. However, by introducing a mix of order and disorder, this degeneracy can be preserved and the compactly localized states can be maintained.
Article
Optics
Mauricio Trujillo-Martinez, Anna Posazhennikova, Johann Kroha
Summary: The temporal expansion of an ultracold Bose gas in two-dimensional square optical lattices was studied, revealing a separation of the expanding bosonic cloud into a fast ballistic forerunner and a slowly expanding central part, driven by the coherent dynamics of the BEC and consistent with the Lieb-Robinson bound. In smaller lattices, quasiparticle collisions were found to lead to enhanced condensate depletion and oscillation damping.
Article
Physics, Fluids & Plasmas
Yanjiang Guo, Yachao Sun, Lei Wang
Summary: The energy diffusion process in a few two-dimensional Fermi-Pasta-Ulam-type lattices is simulated numerically through the equilibrium local energy spatiotemporal correlation. The diffusion propagator consists of a bell-shaped central heat mode and a sound mode extending with a constant speed, in accordance with the nonlinear fluctuating hydrodynamic theory. An effective phonon approach is proposed to estimate the frequencies of renormalized phonons and the sound speed accurately. However, discrepancies are noticeably observed.
Article
Physics, Fluids & Plasmas
W. S. Oliveira, J. Pimentel de Lima, N. C. Costa, R. R. dos Santos
Summary: Researchers studied site and bond percolation on Lieb lattices and used Monte Carlo simulations to obtain accurate critical parameter data. The study found that thresholds increase as the average coordination number decreases, and estimates for the correlation length exponent align with the expectation of no change in the universality class.
Article
Materials Science, Multidisciplinary
Rebecca Kraus, Titas Chanda, Jakub Zakrzewski, Giovanna Morigi
Summary: In this article, a theoretical analysis of the phase diagram of a quantum gas of bosons interacting via repulsive dipolar interactions is conducted. Numerical techniques are used to evaluate the phase diagram for unit density, revealing a significant impact of correlated tunneling on the parameter range of the topological insulator phase.
Article
Physics, Condensed Matter
Oanh K. T. Nguyen, Cong T. Bach, Long D. Dang, Giang H. Bach
Summary: In this study, we investigate the disorder effect on ultracold atoms in an optical lattice by using the expanded Bose-Hubbard model and Quantum Monte Carlo simulation. We discover three additional crystal-like phases at commensurate densities, rho = 1/2, 1, and 3/2, in addition to the superfluid and Mott insulator phases observed in the bare soft-core boson model. In the presence of disorder, the superfluid and charge-density wave coexist in the sandwiched regions between the superfluid and solid orders around the commensurate densities. This observation is significant as it has not been previously revealed in other models of soft-core bosons.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Tomonari Mizoguchi, Hosho Katsura, Isao Maruyama, Yasuhiro Hatsugai
Summary: Flat-band models have attracted significant interest for their fundamental aspects and material realization. This paper presents a method to determine flat-band energies and wave functions in tight-binding models on decorated diamond and pyrochlore lattices in generic dimensions, which are relevant to various organic and inorganic materials in two and three dimensions.
Article
Chemistry, Physical
Xilong Xu, Ting Zhang, Ying Dai, Baibiao Huang, Yandong Ma
Summary: In this study, a novel mechanism for electro-mechanical coupling is proposed, which enables reversible and nonvolatile electric field switching of the dimensions of a 2D lattice through the mediated strength of interlayer interactions in ferroelectric bilayer systems. The validity of this mechanism is demonstrated in a series of real bilayer materials through first-principles calculations. The interface differences due to polarization play a crucial role in realizing such nonvolatile electro-mechanical coupling, and the underlying physical origin is discussed. These explored phenomena and insights offer a novel avenue for the highly desired nonvolatile electric field control of mechanical strain.
NANOSCALE HORIZONS
(2023)
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)
Article
Physics, Multidisciplinary
Luis Antonio Gonzalez-Garcia, Hector Alva-Sanchez, Rosario Paredes
Summary: We investigated the emergence of localization in a weakly interacting Bose gas confined in quasicrystalline lattices with three different rotational symmetries: five-fold, eight-fold, and twelve-fold. By analyzing the inverse participation ratio (IPR) and the Shannon entropy in the coordinate space, we detected localization at a mean field level. These physical quantities were determined through a robust statistical study of the stationary density profiles of the interacting condensate. Localization was observed for each lattice type as a function of the potential depth. The analysis revealed a range of potential depths where the condensate density becomes localized, transitioning from partially at random lattice sites to fully in a single site. We found that localization occurs for the five-fold symmetry in the range of (6E(R), 9E(R)), while for the octagonal and dodecagonal symmetries, it occurs in the interval (12E(R), 15E(R)).
Article
Nanoscience & Nanotechnology
Sangmin Lee, Miyoung Kim, Young-Kyun Kwon
Summary: A hidden Rashba effect has been discovered in two-dimensional materials, showing a spin-layer locking phenomenon that allows for the manipulation of Rashba spin polarization in centrosymmetric materials. This effect is characterized by a unique helical spin texture with complete spin separation in space. The unconventional hidden Rashba effect observed in two-dimensional InTe, which involves two pairs of spin-degenerate bands, broadens our understanding of spin polarization phenomena and has potential applications in spintronics.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Yi-Yin Zheng, Shan-Tong Chen, Zhi-Peng Huang, Shi-Xuan Dai, Bin Liu, Yong-Yao Li, Shu-Rong Wang
Summary: We studied the stability of zero-vorticity and vortex lattice quantum droplets described by a 2D GP equation, finding the stability areas for different numbers of sites and vorticities. The relationship between mu and N for stable LQDs may violate the VK criterion, and two types of vortex LQDs with the same number of sites were found to be degenerate, while zero-vorticity LQDs were not. The offsite-centered LQDs with zero-vorticity and vortex LQDs with S = 1 were heterogeneous.
FRONTIERS OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Sihan Feng, Weicheng Fu, Yong Zhang, Hong Zhao
Summary: This paper studies the relaxation properties of phonons in 1D lattices and finds that asymmetric interparticle interactions lead to larger damping rates of phonons, which follow a power-law relation at low temperatures. This provides insights into understanding anomalous heat conduction in 1D chains and ultra-low phonon heat conduction in certain solids.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Chemistry, Multidisciplinary
Shanbao Chen, Huasheng Sun, Junfei Ding, Fang Wu, Chengxi Huang, Erjun Kan
Summary: This study introduces a new mechanism and identifies an intrinsic 2D single-phase multiferroic semiconductor with high thermal stability. Through the investigation of a CrO3 monolayer, an unconventional crystal field distortion mechanism inducing in-plane electric polarization is discovered, along with the observation of both ferroelectric and antiferroelectric phases.
Article
Multidisciplinary Sciences
Peng Wang, Qidong Fu, Ruihan Peng, Yaroslav Kartashov, Lluis Torner, Vladimir V. Konotop, Fangwei Ye
Summary: This study demonstrates the Thouless topological transport of light in a tunable Moire lattice, which exhibits unique topological features and occurs widely in various scientific areas.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Tahereh Nematiaram, Sergio Ciuchi, Xiaoyu Xie, Simone Fratini, Alessandro Troisi
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Review
Chemistry, Physical
Simone Fratini, Mark Nikolka, Alberto Salleo, Guillaume Schweicher, Henning Sirringhaus
Article
Physics, Multidisciplinary
Arnaud Ralko, Jaime Merino
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Andrej Pustogow, Yohei Saito, Anja Loehle, Miriam Sanz Alonso, Atsushi Kawamoto, Vladimir Dobrosavljevic, Martin Dressel, Simone Fratini
Summary: This study reveals the persistent Fermi-liquid behavior in correlated metals at half filling for varying correlation strength upon approaching a Mott insulator, showing pronounced quadratic dependences and a puzzling elastic contribution. The emergence of a bad metal from resilient quasiparticles near the Mott transition is demonstrated, supported by a theoretical model for the optical response.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Massimiliano Comin, Simone Fratini, Xavier Blase, Gabriele D'Avino
Summary: This study presents a multiscale model for predicting the dielectric properties of doped organic semiconductors, showing a large nonlinear enhancement of the dielectric constant as doping increases. The enhanced screening in the material reduces energy barriers for electron-hole separation, facilitating thermal charge release.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Inaki Garcia-Elcano, Jaime Merino, Jorge Bravo-Abad, Alejandro Gonzalez-Tudela
Summary: Fermi arcs are surface states connecting topologically distinct Weyl points, which showcase the topological aspects of Weyl physics. We investigate the photonic counterpart of these states and demonstrate unique phenomena. We show how to image the Fermi arcs through the spontaneous decay of emitters coupled to the system's border. We also demonstrate the potential of Fermi arc surface states as a robust quantum link, enabling perfect quantum state transfer and the formation of highly entangled states.
Article
Materials Science, Multidisciplinary
Manuel Fernandez Lopez, Ben J. Powell, Jaime Merino
Summary: In this paper, we investigate superconductivity in strongly interacting electrons on a decorated honeycomb lattice. We find that spin-orbit coupling induces an easy-plane ferromagnetic interaction, and hole doping leads to partial occupation of a flat band, resulting in highly sensitive order parameters for superconductivity. We also explore different superconducting phases under various interaction parameters, and observe both first-order and second-order phase transitions. Additionally, we show that the multiple sites per unit cell in the lattice and multiple bands near the Fermi energy give rise to distinct nodal structures in real and reciprocal space.
Article
Physics, Multidisciplinary
Jaime Merino, Arnaud Ralko
Summary: The large thermal Hall conductivity recently observed in Mott insulating cuprates has been attributed to chiral neutral spin excitations. A quantum spin liquid with Majorana excitations, Chern number +/- 4, and large thermal Hall conductivity has been found as an excited state of a frustrated Heisenberg model on the square lattice.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Manuel Fernandez Lopez, Jaime Merino
Summary: The Mott transition in honeycomb compounds with significant spin-orbit coupling was explored. At finite temperatures, a novel semimetallic phase was identified between a topological insulator and a topological Mott insulator, characterized by gapped spin excitations with nontrivial topological properties.
Article
Materials Science, Multidisciplinary
K. Driscoll, A. Ralko, S. Fratini
Summary: In correlated electron systems, the metallic character of a material can be strongly suppressed near an integer concentration of conduction electrons as a result of Coulomb interactions forbidding double occupancy of local atomic orbitals. A new general route for obtaining correlated behavior, different from the Mott-Hubbard mechanism, is explored here, relying on unscreened, long-range Coulomb interactions to create a pseudogap metal phase characterized by divergent quasiparticle mass and a Coulomb pseudogap in the electronic spectrum. The Fermi-liquid state is destroyed due to the frustrating nature of long-range potentials slowing down collective charge rearrangements in the nearly frozen, disordered charge background.
Article
Materials Science, Multidisciplinary
Jaime Merino, Manuel Fernandez Lopez, Ben J. Powell
Summary: In this study, electron correlation driven superconductivity was observed on a decorated honeycomb lattice, leading to singlet superconductivity with extended-s, extended-d, and f-wave symmetries. The f-wave singlet pairing enabled by lattice decoration could potentially result in high-temperature superconductivity in materials like Rb3TT center dot 2H(2)O and Mo3S7(dmit)(3).
Article
Materials Science, Multidisciplinary
Zekun Zhuang, Jaime Merino, J. B. Marston
Article
Materials Science, Multidisciplinary
Manuel Fernandez Lopez, Jaime Merino
Article
Physics, Multidisciplinary
Joseba Goikoetxea, Jorge Bravo-Abad, Jaime Merino
JOURNAL OF PHYSICS COMMUNICATIONS
(2020)
Article
Physics, Multidisciplinary
S. Fratini, S. Ciuchi
PHYSICAL REVIEW RESEARCH
(2020)
