Article
Physics, Multidisciplinary
Henock Ngoubi, Raoul yonkeu Mbakob, Issa Sali, Germain Hubert Ben-Bolie, Timoleon Crepin Kofane
Summary: This article investigates the dynamics of DNA breather motion using the modified Peyrard-Bishop-Dauxois model, and shows that it is governed by the complex quintic Ginzburg-Landau equation. The impact of the quintic term on breather formations and the characteristics of wave excitations generated by the introduction of the quintic nonlinearity are discussed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Optics
Pan Wang, Jiangyong He, Xiaosheng Xiao, Zhi Wang, Yange Liu
Summary: This study presents theoretical investigations on the filter-induced instability mechanism in passive driven fiber resonators. Numerical simulations demonstrate coherent frequency combs with rates up to sub-terahertz level. The comparison with other types of instabilities reveals the intrinsic distinction in the family of modulation instabilities. These findings have significant implications for the development of ultrahigh-repetition-rate frequency comb generation.
PHOTONICS RESEARCH
(2022)
Article
Physics, Fluids & Plasmas
Y. He, A. Witt, S. Trillo, A. Chabchoub, N. Hoffmann
Summary: Modulation instability is a focusing mechanism that can generate strong wave localizations on water surfaces and in other nonlinear dispersive media. By studying the exact solutions of the nonlinear Schrodinger equation, it has been found that phase-shift localization applied to the background can trigger extreme events.
Article
Physics, Multidisciplinary
Yuchen He, Alexey Slunyaev, Nobuhito Mori, Amin Chabchoub
Summary: The study discusses the formation mechanism of nonlinear wave focusing and the role of modulation instability in this process. Experimental evidence is used to demonstrate that MI can still exist stably in the scenario of two counterpropagating wave trains, unaffected by the broadband or directional wave field.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Juanfen Wang, Yuan Jin, Xuguang Gong, Lingzhen Yang, Jie Chen, Pingping Xue
Summary: In this study, random soliton-like beams generated based on the Kuznetsov-Ma solitons in a nonlinear fractional Schrodinger equation (NLFSE) are investigated. It is found that in the nonlinear regime, the Kuznetsov-Ma solitons can evolve into random soliton-like beams due to collapse, with the number and peak intensity of the beams depending on the nonlinear coefficient and Levy index.
Article
Physics, Multidisciplinary
Yiming Pan, Moshe-Ishay Cohen, Mordechai Segev
Summary: We propose superluminal solitons residing in the momentum gap (k gap) of nonlinear photonic time crystals. These solitons are structured as plane waves in space while periodically selfreconstructing wave packets in time. Compared to the stationary nature of Bragg gap solitons, the k-gap solitons emerge from modes with infinite group velocity, causing superluminal evolution.
PHYSICAL REVIEW LETTERS
(2023)
Article
Mathematics, Interdisciplinary Applications
Xiuye Liu, Jianhua Zeng
Summary: Dark solitons, localized nonlinear waves, have attracted significant attention due to their rich formation and dynamics in various fields. In this study, a purely nonlinear strategy is used to stabilize dark soliton stripes by introducing a quasi-one-dimensional Gaussian-like trap and combining it with an external linear harmonic trap. The results demonstrate complete stabilization of dark soliton stripes and a significant reduction in modulational instability.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Optics
Sergey K. Ivanov, Yaroslav Kartashov, Matthias Heinrich, Alexander Szameit, Lluis Torner, Vladimir V. Konotop
Summary: A novel type of topological dipole soliton is theoretically introduced in a specific topological insulator structure, with bright envelopes of different symmetries. These solitons can exist under the unique spectral features of edge states in the structure.
Article
Mathematics, Applied
Zhixiang Deng, Yu Chen, Jun Liu, Chujun Zhao, Dianyuan Fan
Summary: This study focuses on the spectral analysis of light propagating in normally dispersive graded-index multimode fibers under initial noisy conditions. The research reveals high correlation between conjugate couples of well-separated spectral sidebands, while cross-combinations exhibit a poor degree of correlation. These results provide insights into the independent occurrence of geometric parametric instability processes associated with each sideband pair, which can be beneficial for the future implementation of high-efficiency photon pair sources with reduced Raman decorrelations.
Article
Physics, Multidisciplinary
Nicolas Englebert, Nathan Goldman, Miro Erkintalo, Nader Mostaan, Simon-Pierre Gorza, Francois Leo, Julien Fatome
Summary: Synthetic dimensions can introduce band properties without a periodic structure in real space, and a study in an optical resonator has now shown non-linear soliton states in synthetic frequency space. By coupling the discrete degrees of freedom of a physical system, synthetic dimensions can construct fictitious lattice structures, providing a way to study band properties in the absence of a real periodic lattice structure. Non-linearities and dissipation in synthetic dimensions have potential for rich physics, but have not been extensively explored.
Article
Mechanics
Muhammad Ishaq, Zhi-Min Chen, Qingkai Zhao
Summary: In this study, the ideal fluid model of an inviscid fluid is considered, assuming adiabatic and incompressible flow that is irrotational. The derived system of equations describes motion in two dimensions using Laplace equation with appropriate boundary conditions. The nonlinear Korteweg-De Vries equation is derived to investigate the interaction of multiple periodic waves, revealing wave energy transfer and characteristics of solitons.
Article
Physics, Multidisciplinary
D. S. Agafontsev, A. A. Gelash
Summary: The study indicates that the largest rogue waves in both systems have practically identical dynamical and statistical properties, suggesting that multi-soliton interaction may be the main mechanism for rogue wave formation in modulational instability cases. Additionally, it is demonstrated that most of the largest rogue waves can be well approximated by the amplitude-scaled rational breather solution of the second order in both space and time.
FRONTIERS IN PHYSICS
(2021)
Article
Multidisciplinary Sciences
Urban Mur, Miha Ravnik, David Sec
Summary: In this study, tunable light beam control based on multi-layer liquid-crystal cells and an external electric field was demonstrated. This device allows for precise control of outgoing light propagation and has potential applications in projectors or automotive headlamps.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Fluids & Plasmas
Ping-Tong Qian, Xiao-Bo Zhang, Chen Jiao, Xiang-Yu Cui, Ai-Xia Zhang, Ju-Kui Xue
Summary: The interaction between an electromagnetic pulse and a relativistic hot plasma is studied analytically and numerically, revealing the transition from wakefield generation to soliton excitation. Nonlinear Schrodinger equations are derived and bright and dark soliton solutions are obtained. The stability phase diagram of solitons and modulation instability of plane waves are also studied. The results show that the wakefield-soliton transition depends on plasma density and thermal effects. This research provides theoretical evidence for understanding high-power laser plasma interactions.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Multidisciplinary
Conrad Bertrand Tabi, Saravana Veni, Timoleon Crepin Kofane
Summary: The modulational instability of continuous waves in a two-component Bose-Einstein condensate with a mixture of Rashba and Dresselhaus spin-orbit couplings and the Lee-Huang-Yang term is investigated theoretically and numerically. It is found that instability can be induced in the presence of the RD spin-orbit coupling under suitable balance between nonlinear and dispersive effects. The emergence of multi-peaked solitons and exotic vortex structures in direct numerical simulations confirms the analytical predictions and suggests that modulational instability is a suitable mechanism for generating matter waves.
Article
Physics, Multidisciplinary
Matteo Ciardi, Tommaso Macri, Fabio Cinti
Summary: This work explores methodology for investigating interacting systems with contact interactions, introducing a class of zonal estimators for path-integral Monte Carlo methods aimed at providing physical information about limited regions of inhomogeneous systems. The usefulness of zonal estimators is demonstrated through their application to a system of trapped bosons in a quasiperiodic potential in two dimensions, focusing on finite temperature properties across a wide range of potential values. Finally, the generalization of such estimators to local fluctuations of particle numbers and magnetic ordering in multi-component systems, spin systems, and systems with nonlocal interactions is discussed.
Article
Optics
G. D. Telles, P. E. S. Tavares, A. R. Fritsch, A. Cidrim, V. S. Bagnato
Summary: This study reports the observation of twisted decay of quadruply charged vortices in an atomic Bose-Einstein condensate. Numerical simulations confirm that singly-charged vortices resulting from the decay exhibit twisted, helical Kelvin waves.
LASER PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Roshan Sajjad, Jeremy L. Tanlimco, Hector Mas, Alec Cao, Eber Nolasco-Martinez, Ethan Q. Simmons, Flavio L. N. Santos, Patrizia Vignolo, Tommaso Macri, David M. Weld
Summary: This article reports the experimental observation of the quantum boomerang effect and elucidates the crucial role of initial-state symmetries in this effect. The results highlight the importance of Anderson localization and provide a unique experimental probe of the underlying quantum nature of localized matter.
Article
Optics
Pierre Lassegues, Mateus Antonio Fernandes Biscassi, Martial Morisse, Andre Cidrim, Nolan Matthews, Guillaume Labeyrie, Jean-Pierre Rivet, Farrokh Vakili, Robin Kaiser, William Guerin, Romain Bachelard, Mathilde Hugbart
Summary: This paper discusses the relationship between the Siegert relation and the intensity temporal correlations, and examines the validity of this relation in the fields of astrophysics and quantum scattering.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Multidisciplinary Sciences
Luca Salasnich
Summary: The density of states of a quantum system can be obtained through different methods such as calculation from definition, deducing from microcanonical entropy or canonical partition function. In this paper, a numerical method is suggested to obtain the density of states from the Helmholtz free energy, which is equivalent to a Legendre transformation. The method is applied to determine the many-body density of states of the unitary Fermi gas, and also to review the density of states of a Schwarzschild black hole.
Review
Physics, Applied
Andrea Tononi, Luca Salasnich
Summary: Atomic gases confined in curved geometries exhibit distinct features compared to those in flat geometries, such as periodic boundaries, local curvature, and nontrivial topologies. Recent experiments on shell-shaped quantum gases and ring-shaped superfluids suggest that the manifold of a quantum gas could be controlled, allowing for the study of curved many-body quantum systems. This Perspective article examines the physics of these gases in different curved geometries, discussing phase transitions, superfluid dynamics, and future research directions.
NATURE REVIEWS PHYSICS
(2023)
Article
Physics, Condensed Matter
Stefania De Palo, Edmond Orignac, Roberta Citro, Luca Salasnich
Summary: We study a gas of bosonic dipolar atoms in the presence of a transverse harmonic trapping potential by using an improved variational Bethe ansatz, which includes the transverse width of the atomic cloud as a variational parameter. Our calculations show that the system behavior evolves from quasi-one dimensional to a strictly one-dimensional one by changing the atom-atom interaction, or the axial density, or the frequency of the transverse confinement. Quite remarkably, in the droplet phase induced by the attractive dipolar interaction the system becomes sub-one dimensional when the transverse width is smaller than the characteristic length of the transverse harmonic confinement.
Article
Optics
Koichiro Furutani, Andrea Perali, Luca Salasnich
Summary: We theoretically investigate the Berezinskii-Kosterlitz-Thouless transition in a binary mixture of bosonic atoms with Rabi coupling. The transition temperature shows a nonmonotonic behavior with respect to the intercomponent coupling and an amplification for finite Rabi coupling. By developing the Nelson-Kosterlitz renormalization-group equations, we clarify the dependence of the transition temperature on the Rabi coupling and the intercomponent coupling. Our results contribute to the understanding of multicomponent quantum systems, such as multiband superconductors.
Article
Optics
F. Lorenzi, A. Bardin, L. Salasnich
Summary: We investigate the scattering theory of two particles in a D-dimensional space and derive analytical formulas for the s-wave phase shift by using an on-shell approximation. These results provide explicit expressions of the low-momentum parameters g similar to 0 and g similar to 2 of the interaction potential in terms of the s-wave scattering length and effective range. Our findings, depending on the spatial dimension, serve as a useful benchmark for calculations in few-body and many-body systems. We also apply these results to obtain the zero-temperature pressure of a two-dimensional uniform interacting Bose gas with a beyond-mean-field correction incorporating scattering length and effective range.
Article
Optics
A. Brollo, A. Veronese, L. Salasnich
Summary: This study investigates various properties of a two-site anyonic Josephson junction, such as Josephson frequency, imbalanced solutions, macroscopic quantum self-trapping, coherence visibility, and condensate fraction, and highlights the crucial role of the anyonic angle. The theoretical predictions serve as an important reference for future experimental quantum simulations of anyonic matter in double-well potentials.
Article
Materials Science, Multidisciplinary
Flavio Noronha, Tommaso Macri
Summary: The quantum boomerang effect (QBE) has been recently observed in an experiment simulating the quantum kicked-rotor model. This effect refers to the phenomenon of particles with finite initial velocity returning and stopping at the original location in a disordered potential. Analytical arguments support the presence of QBE in a wide range of disordered systems. The conditions for observing QBE include Anderson localization, the reality of the spectrum for non-Hermitian systems, the invariant property of the disorder realizations, and the initial state being an eigenvector of a specific operator. The QBE can also be observed in momentum space under different conditions, allowing its presence in time-reversal-symmetry-broken models and non-Hermitian models. Examples are provided to illustrate the QBE in different models. However, weakly interacting bosonic systems do not exhibit a real-space (momentum-space) QBE due to the breaking of reflection-timereversal (time-reversal) symmetry.
Article
Physics, Multidisciplinary
Luca Salasnich
Summary: This study investigates the effects of spatial curvature on an atomic Bose-Einstein condensate confined in an elliptical waveguide. The results show that the system undergoes a quantum phase transition from a two-peak configuration to a one-peak configuration at a critical attractive interaction strength. This phase transition also leads to a significant reduction in the superfluid fraction, which goes to zero for a sufficiently attractive Bose-Bose interaction.
SCIPOST PHYSICS CORE
(2022)
Article
Optics
G. Bighin, A. Burchianti, F. Minardi, T. Macri
Summary: In this paper, we investigate the fate of an impurity in an ultracold heteronuclear Bose mixture, with a focus on the experimentally relevant case of a K-41 - Rb-87 mixture, where the impurity is in a K-41 hyperfine state. Our findings show that by varying the interactions, the impurity can localize either at the center or at the surface of the droplet.
Article
Materials Science, Multidisciplinary
Bruno R. de Abreu, Fabio Cinti, Tommaso Macri
Summary: This paper investigates the search for spontaneous pattern formation in equilibrium phases with genuine quantum properties. The effect of quantum fluctuations and exchange interactions on the phases of an ensemble of bosonic particles is studied. Extensive simulations reveal a rich phase diagram with supersolid stripes, kagome, and triangular crystals in the low-density regime, as well as patterns with 12-fold rotational symmetry in the high-density limit. The quantum phases are characterized by computing the superfluid density and the bond-orientational order parameter. Differences between the findings of this study and classical equilibrium phases for the same parameter regimes are highlighted.
Article
Optics
Matteo Ciardi, Tommaso Macri, Fabio Cinti
Summary: In this paper, we study the finite-temperature properties of a 2D trapped boson system in a quasiperiodic potential using ab initio path integral Monte Carlo simulations. We find the existence of a robust Bose glass phase, which is not affected by thermal fluctuations up to about half of the critical temperature of the noninteracting system. We characterize local quantities in the trap using zonal estimators and present a phase diagram for a set of parameters relevant to current experiments with quasi-2D optical confinement.
