Article
Materials Science, Multidisciplinary
Yasuyuki Kato, Yukitoshi Motome
Summary: Topological defects known as magnetic hedgehogs can produce emergent magnetic monopoles, which are not observed in ordinary electromagnetism. We propose a theoretical model that can stabilize both tetrahedral and cubic hedgehog lattices and study the phase diagram with changes in interaction parameters, magnetic field, and temperature. We find various topological transitions, some of which exhibit singular behavior in thermodynamic quantities.
Article
Optics
Guochao Wei, Zhenzhen Liu, Licheng Wang, Jianyuan Song, Jun-Jun Xiao
Summary: This study demonstrates the existence of topological valley and pseudo-spin edge states in a carefully designed two-dimensional Kekule photonic crystal with time reversal symmetry. The presence of these edge states was confirmed through theoretical, numerical, and experimental analysis, and their distinct characteristics were identified through transmission measurements and end-scattering analysis.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Physical
J. T. Kong, Z. X. Yan, W. Song, W. L. Li, You X., W. Y. Xu, Q. Cheng, D. X. Li
Summary: In this study, we predict manganese diboride (Mn2B2) as an intrinsic two-dimensional antiferromagnetic topological superconductor that exhibits Majorana zero-modes (MZM) in its edge states. The existence of spin-polarized helical gapless edge states in Mn2B2 induces MZM when it enters the superconducting state. The Z(2) topological non-trivial properties of Mn2B2 are confirmed through Wannier charge centers (WCC) and the spin Hall conductivity platform near the Fermi level. The phonon-electron coupling suggests s-wave superconductivity with a critical temperature (Tc) of 6.79 K.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Huihai Wu, Xiaochuan Liu, Yuepei Cai, Longji Cui, Yong Huang
Summary: This paper investigates the near-field radiative heat transfer in three-dimensional topological insulators (3D TIs) and demonstrates the potential of 3D TIs in manipulating near-field thermal radiation by controlling the coupling between surface and bulk states. The findings provide useful insights for energy conversion and thermal management.
MATERIALS TODAY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Aniceto B. Maghirang III, Rovi Angelo B. Villaos, Zhi-Quan Huang, Chia-Hsiu Hsu, Guoqing Chang, Feng-Chuan Chuang
Summary: Using first-principles computations, researchers investigated the structural stability, electronic, and topological properties of 60 monolayer half-Heusler compounds. They identified 6 compounds with nontrivial topological properties and predicted the possible occurrence of a charge density wave phase in one of the compounds. This research provides a foundation for discovering 2D topological materials for future technological applications.
CHINESE JOURNAL OF PHYSICS
(2023)
Review
Mathematics, Applied
Mark J. Ablowitz, Justin T. Cole
Summary: In recent years, the study of wave propagation in nonlinear photonic lattices has attracted considerable interest. This review article focuses on the propagation of wave envelopes in periodic lattices associated with additional potential in the nonlinear Schrodinger equation. The tight-binding approximation is used to find the linear dispersion relation and the equations governing nonlinear discrete envelopes, and continuous envelope equations are derived from the discrete system in the limit of slowly varying envelopes. The article also explores the potential realization of topological insulator systems in an optical waveguide setting.
PHYSICA D-NONLINEAR PHENOMENA
(2022)
Review
Materials Science, Multidisciplinary
Shiqi Xia, Daohong Song, Nan Wang, Xiuying Liu, Jina Ma, Liqin Tang, Hrvoje Buljan, Zhigang Chen
Summary: The article reviews recent work demonstrating topological phenomena in reconfigurable photonic lattices, including one-dimensional nonlinear topological states and gap solitons, as well as two-dimensional universal mapping of topological singularities in momentum space and realization of nontrivial loop states in real space in photonic lattices.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Peng Li, Jinjun Ding, Steven S-L Zhang, James Kally, Timothy Pillsbury, Olle G. Heinonen, Gaurab Rimal, Chong Bi, August DeMann, Stuart B. Field, Weigang Wang, Jinke Tang, Jidong Samuel Jiang, Axel Hoffmann, Nitin Samarth, Mingzhong Wu
Summary: This study reports a genuine topological Hall effect in a TI/MI structure, where the contribution of skyrmions to the Hall effect outweighs the coexistence of magnetic phases.
Article
Physics, Multidisciplinary
Ruochen Ma, Chong Wang
Summary: In this study, we demonstrate that symmetry-protected topological (SPT) phases can also be applied to average symmetries, where local quenched disorders break the symmetries but restore them upon disorder averaging. We classify and characterize a large class of average SPT phases using a decorated domain wall approach, and show that the boundary states of such phases will almost certainly be long-range entangled. We also develop a theory for generalized average SPT phases based on density matrices and quantum channels, indicating that topological quantum phenomena associated with average symmetries can be as rich as those with exact symmetries.
Article
Physics, Multidisciplinary
Yafei Ren, Cong Xiao, Daniyar Saparov, Qian Niu
Summary: The study investigates the adiabatic evolution of electronic states induced by the lattice vibration of a chiral phonon, obtaining electronic orbital magnetization in the form of a topological second Chern form. The traditional theory needs refinement by introducing a k-resolved Born effective charge and accounting for the phonon-modified electronic energy and momentum-space Berry curvature contribution. The second Chern form may diverge when a Yang's monopole is near the parameter space of interest, as demonstrated in a gapped graphene model at the Brillouin zone corner.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Multidisciplinary
RuiShan Wei, QingLong Zhang, DanDan Yang, XiongJian Huang, QiWen Pan, Juan Kang, JianRong Qiu, ZhongMin Yang, GuoPing Dong
Summary: Recently discovered square-root topological insulators are intriguing phases with inherited topological properties from the squared Hamiltonian and double-band structures. The square root mechanism has been generalized to 2(n)-root topological insulators, providing more band gaps. In this study, we experimentally realize one-dimensional 2(n)-root topological insulators in photonic waveguide arrays using the Su-Schrieffer-Heeger (SSH) model. We observe clearly visible topological edge states with tunable numbers under visible light, and demonstrate the localization and multiple numbers of edge states in 2(n)-root topological systems by visualizing the dynamic evolutions of light propagation with varying sample lengths. This experiment provides a stable platform for studying topological states with a remarkable degree of flexibility and control, by constructing 2(n)-root topological photonic lattices in various geometric arrangements.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Wei Chen
Summary: We propose a universal topological marker that can map the topological order to lattice sites for topological insulators and superconductors with Dirac models in any dimension and symmetry class. By introducing a topological operator derived from a momentum-space universal topological invariant, we construct the topological marker by alternating projectors, position operators, and Dirac matrices. The off-diagonal elements of the topological operator yield a non-local topological marker, representing a Wannier state correlation function, which decays with a diverging correlation length at topological phase transitions. Various prototype examples are employed to demonstrate the universality of our formalism.
Article
Physics, Multidisciplinary
Jie Gu, Yunfeng Jiang, Marcus Sperling
Summary: Twisted double-and mono-bilayer graphene are graphene-based moire materials hosting strongly correlated fermions in a gate-tunable conduction band with topologically non-trivial properties. The strong electron-electron interactions lead to a non-coplanar magnetic state and a set of competing ferromagnetic, topological charge density waves. The formation of charge density wave order, connected to a skyrmion lattice phase, is consistent with recent experiments.
Article
Multidisciplinary Sciences
Pedro J. Saenz, Giuseppe Pucci, Sam E. Turton, Alexis Goujon, Rodolfo R. Rosales, Jorn Dunkel, John W. M. Bush
Summary: The passage introduces hydrodynamic spin lattices (HSLs) of 'walking' droplets as a class of active spin systems with particle-wave coupling, revealing various non-equilibrium symmetry-breaking phenomena that can be controlled by varying lattice geometry and system rotation. Theoretical predictions based on a generalized Kuramoto model rationalize experimental observations, establishing HSLs as a versatile platform for exploring active phase oscillator dynamics. The tunability of HSLs suggests exciting directions for future research, from active spin-wave dynamics to hydrodynamic analogue computation and droplet-based topological insulators.
Article
Physics, Multidisciplinary
Y. X. Zhao, Cong Chen, Xian-Lei Sheng, Shengyuan A. Yang
Summary: The study reveals the possibility of switching the two fundamental classes via Z(2) projective representations, allowing for unique topological phases to be achieved in different classes. For PT symmetry, the occurrence of this switching mechanism is demonstrated when P inverses the gauge transformation required to recover the original Z(2) gauge connections under P.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Zahra Baghali Khanian, Manabendra Nath Bera, Arnau Riera, Maciej Lewenstein, Andreas Winter
Summary: We extend the previous results on quantum thermodynamics to the case of multiple non-commuting charges and develop a resource theory of thermodynamics for asymptotically many non-interacting systems. The phase diagram of the system is formed by associating the vector of expected charge values and entropy with every state. Our key result is the Asymptotic Equivalence Theorem, which connects the equivalence classes of states under asymptotic charge-conserving unitaries with the points on the phase diagram. Using the phase diagram, we analyze the first and second laws of thermodynamics and provide insights into the storage of different charges in physically separate batteries.
ANNALES HENRI POINCARE
(2023)
Editorial Material
Physics, Multidisciplinary
Carlo Manzo, Gorka Munoz-Gil, Giovanni Volpe, Miguel Angel Garcia-March, Maciej Lewenstein, Ralf Metzler
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Quantum Science & Technology
Lin Zhang, Utso Bhattacharya, Adrian Bachtold, Stefan Forstner, Maciej Lewenstein, Fabio Pistolesi, Tobias Grass
Summary: Quantum dots placed on a vibrating nanotube provide a platform for studying electron-phonon interactions, which has promising prospects for discovering new quantum materials and understanding strong correlation effects. By coupling the dots to an electronic reservoir, the state of the system can be easily prepared. Our study shows that for certain coupling strengths, the system undergoes a Peierls transition into an insulating regime with charge-density wave order in the steady state, resulting from the competition between electronic Coulomb repulsive interactions and phonon-induced attractive interactions. The transport phenomena observed can serve as fingerprints of electronic correlations. We also present powerful numerical methods to capture the physics of this open electron-phonon system with a large number of phonons. Our work paves the way for studying and detecting correlated electron-phonon physics with current experimental techniques in nanotube quantum simulators.
NPJ QUANTUM INFORMATION
(2023)
Article
Physics, Multidisciplinary
H. Jiang, M. Mandrysz, A. Sanchez, J. Dura, T. Steinle, J. S. Prauzner-Bechcicki, J. Zakrzewski, M. Lewenstein, F. He, J. Biegert, M. F. Ciappina
Summary: This study investigates the non-sequential double ionization (NSDI) in argon induced by a 3100 nm laser source through joint experimental and theoretical approaches. The correlated photoelectron momentum distribution (PMD) is found to strongly depend on the pulse duration, which can be explained by an envelope-induced intensity effect. The laser vector potential at the ionization time of the bound electron is influenced by the pulse duration, leading to different drift momenta. This work highlights the significance of pulse duration in NSDI and enhances our understanding of strong field tunnel-recollision dynamics under mid-IR laser fields.
NEW JOURNAL OF PHYSICS
(2023)
Article
Quantum Science & Technology
Lorenzo Cardarelli, Sergi Julia-Farre, Maciej Lewenstein, Alexandre Dauphin, Markus Mueller
Summary: This work investigates a realistic scenario for the quantum simulation of interaction-induced topological phases using cold Rydberg-dressed atoms in optical lattices. The phase diagram of spinless fermions on a checkerboard lattice is analyzed in the mean-field approximation, and the stability of the phases with respect to temperature and quantum fluctuations is studied. An implementation protocol is proposed to access the topological properties of the model in state-of-the-art cold atom quantum simulators.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
U. Bhattacharya, Th Lamprou, A. S. Maxwell, A. Ordonez, E. Pisanty, J. Rivera-Dean, P. Stammer, M. F. Ciappina, M. Lewenstein, P. Tzallas
Summary: Strong laser field physics and quantum optics have been recently connected. Studies have shown that intense laser-matter interactions can generate controllable entangled and non-classical light states, opening up new research areas in these fields.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Review
Physics, Multidisciplinary
Irenee Frerot, Matteo Fadel, Maciej Lewenstein
Summary: This review discusses methods for detecting and characterizing quantum correlations in many-body systems, with a focus on scalable approaches. It introduces concepts such as quantum entanglement, Einstein-Podolsky-Rosen steering, and Bell nonlocality, both in the bipartite scenario and their generalizations to multipartite cases. The review also covers recent progress in characterizing quantum correlations, experimental techniques for preparing and measuring highly-entangled many-body systems, and the challenges associated with each platform. It concludes with a list of open problems in the field.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Piotr Sierant, Titas Chanda, Maciej Lewenstein, Jakub Zakrzewski
Summary: We investigate the dynamics of a single mobile impurity in a bath of Anderson localized particles in the regime of relatively strong disorder and interactions. We find that at short times, there is evidence of many-body localization, but at longer timescales, the impurity spreads subdiffusively and gradually delocalizes the Anderson insulator. The observed phenomenology includes subdiffusive growth of mean square displacement, power-law decay of density correlation functions, and power-law growth of entanglement entropy.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Maciej Lewenstein, Antonello Scardicchio, Jakub Zakrzewski
Summary: We use a polynomially filtered exact diagonalization algorithm to study the many-body localization (MBL) transition in disordered Floquet systems. We focus on the disordered kicked Ising model and demonstrate quantitatively that finite-size effects at the MBL transition are less severe than in the random field XXZ spin chains commonly studied in the context of MBL. Our findings also apply to other disordered Floquet models, showing smaller finite-size effects than those observed in typical disordered autonomous spin chains. We observe consistent indications of the MBL transition for several indicators of ergodicity breaking in the kicked Ising model. Additionally, we find that assuming a power-law divergence of the correlation length at the MBL transition yields a critical exponent nu approximately equal to 2, in agreement with the Harris criterion for one-dimensional disordered systems.
Article
Physics, Multidisciplinary
Borja Requena, Gorka Munoz-Gil, Maciej Lewenstein, Vedran Dunjko, Jordi Tura
Summary: This paper proposes a novel approach that combines relaxation techniques with deep reinforcement learning to find the best possible bounds within a limited computational budget. The viability and effectiveness of the method are illustrated through benchmark tests on two paradigmatic problems in quantum physics and quantum information processing. The results show that the proposed approach has good feasibility and performance.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Tomasz Szoldra, Piotr Sierant, Maciej Lewenstein, Jakub Zakrzewski
Summary: In this study, we introduce a correlation function difference (CFD) based on local density correlation functions for a one-dimensional spin system. By comparing correlations on a given site between a full system and its restriction, CFD provides useful information on transfer of information in quantum many-body systems. We investigate the examples of different phases in a disordered XXZ spin chain and find that CFD exhibits different behaviors in the ergodic and many-body localized regimes.
Article
Quantum Science & Technology
Philipp Stammer, Javier Rivera-Dean, Andrew Maxwell, Theocharis Lamprou, Andres Ordonez, Marcelo F. Ciappina, Paraskevas Tzallas, Maciej Lewenstein
Summary: Intense laser-matter interactions are of great interest in research and technology, playing important roles in atomic, molecular, and optical physics, as well as attosecond physics and ultrafast optoelectronics. Recent investigations have shown that these interactions can generate controllable high-photon-number entangled coherent states and coherent state superpositions. This tutorial provides a comprehensive fully quantized description of intense laser-atom interactions, covering processes such as high-harmonic generation and above-threshold ionization. It also discusses new phenomena that cannot be explained by semiclassical theories and explores the potential for quantum state engineering of light.
Article
Optics
Marlena Dziurawiec, Tanausu Hernandez Yanes, Marcin Plodzien, Mariusz Gajda, Maciej Lewenstein, Emilia Witkowska
Summary: Spin-squeezing protocols enable the generation of highly correlated quantum many-body states, which can enhance entanglement-inspired metrology and technologies. We investigate a quantum simulator utilizing twisting dynamics in a two-component Bose-Hubbard model with dipolar interactions. Our results demonstrate that the interplay of contact and long-range dipolar interactions in the superfluid phase activates an anisotropic two-axis countertwisting mechanism, accelerating spin-squeezing dynamics and achieving Heisenberg-limited accuracy in spectroscopic measurements.
Article
Astronomy & Astrophysics
Valentin Kasper, Torsten V. Zache, Fred Jendrzejewski, Maciej Lewenstein, Erez Zohar
Summary: Lattice gauge theories play a fundamental role in various fields such as particle physics, condensed matter, and quantum information theory. While recent advancements in controlling artificial quantum systems have allowed for studying Abelian lattice gauge theories in tabletop experiments, realizing non-Abelian models remains challenging. In this study, we propose a coherent quantum control scheme to enforce non-Abelian gauge invariance in a one-dimensional SU(2) lattice gauge system and discuss the potential extension to other non-Abelian gauge symmetries and higher spatial dimensions. The presented coherent control scheme holds promise for the quantum simulation of non-Abelian lattice gauge theories due to its wide applicability.
Article
Physics, Multidisciplinary
Luca Barbiero, Josep Cabedo, Maciej Lewenstein, Leticia Tarruell, Alessio Celi
Summary: We propose a scheme to realize a frustrated Bose-Hubbard model with ultracold atoms in an optical lattice that comprises the frustrated spin-1/2 quantum XX model. Our scheme utilizes a magnetic flux in a square ladder with one real and one synthetic spin dimension. Although this system does not have geometrical frustration, it can be mapped into an effective triangular ladder with staggered fluxes at low energies for specific values of synthetic tunneling. The scheme allows for minimal instances of frustrated magnets without the need for real geometrical frustration, in a setup of minimal experimental complexity.
PHYSICAL REVIEW RESEARCH
(2023)
