Article
Nanoscience & Nanotechnology
Zhiming Chen, Jianhua Zeng
Summary: This study theoretically and numerically investigates the formation, properties, and dynamics of matter-wave localized gap modes in a one-dimensional nanoscale darkstate optical lattice. It reveals that localized modes in deeply subwavelength adiabatic lattices exhibit a cusplike mode, contrary to previously reported results in conventional deep optical lattices.
Article
Physics, Fluids & Plasmas
Ross Parker, Alejandro Aceves, Jesus Cuevas-Maraver, P. G. Kevrekidis
Summary: In this work, a topological two-dimensional lattice with periodically time-dependent interactions is revisited, identifying fundamental solitons and analyzing their Floquet stability. Multisoliton analogs show different stability properties.
Article
Materials Science, Multidisciplinary
S. Mukherjee, V. K. Kozin, A. Nalitov, I. A. Shelykh, Z. Sun, D. M. Myers, B. Ozden, J. Beaumariage, M. Steger, L. N. Pfeiffer, K. West, D. W. Snoke
Summary: The study focused on the effect of pseudomagnetic field on a polariton condensate in a ring-shaped microcavity, resulting in a stable four-leaf pattern. The pattern was found to originate from the interaction of cavity potential, energy relaxation, and TE-TM splitting. Comparisons with the dissipative one-dimensional spinor Gross-Pitaevskii equation with the TE-TM splitting energy showed good qualitative agreement.
Article
Mathematics, Interdisciplinary Applications
Xiuye Liu, Jianhua Zeng
Summary: This article introduces the nonlinear localization of dense Bose-Einstein condensates (BECs) in a novel two-dimensional twisted periodic potential called Moire optical lattices, which bridge the gap between perfect optical lattices and aperiodic ones. The Moire optical lattices display wider second gaps and flat-band features, and support localized matter-wave structures like gap solitons and topological states within the finite gaps of the linear Bloch-wave spectrum. These localized structures have wide stability regions and can be readily implemented with currently available optical-lattice techniques.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mathematics, Interdisciplinary Applications
Junbo Chen, Jianhua Zeng
Summary: Investigated the existence, properties, and stability of one-dimensional matter-wave gap solitons and soliton clusters in optical lattices with competitive cubic-quintic nonlinearity, identifying stable and unstable regions for dark gap solitons and clusters.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Optics
P. Sturmer, M. Nilsson Tengstrand, R. Sachdeva, S. M. Reimann
Summary: This study investigates the stationary structures and breathing mode behavior of a two-dimensional self-bound binary Bose droplet using both an analytical approach and numerical solutions. It is found that the super-Gaussian ansatz is more effective in describing the system properties compared to the Gaussian ansatz. The preference for the breathing mode over the self-evaporating process is observed for large nonrotating droplets, while the results differ based on the ansatz for small self-bound systems.
Article
Physics, Fluids & Plasmas
Jun Hong, Chenhui Wang, Yongping Zhang
Summary: In this paper, a method to stabilize the Bloch states in BECs is proposed, which is achieved by using an out-of-phase linear lattice. The stabilization mechanism is explained through the averaged interaction. Furthermore, the effect of incorporating a constant interaction into BECs with mixed nonlinear and linear lattices on the instabilities of Bloch states in the lowest band is revealed.
Article
Optics
S. Barland, P. Azam, G. L. Lippi, R. A. Nyman, R. Kaiser
Summary: This study reports on the experimental investigation of photon thermalization and condensation in a semiconductor microresonator in the weak-coupling regime. The observed phase transition and identified saturation of population at high energies and superlinear increase of occupation at low energy suggest Bose-Einstein condensation of photons in equilibrium with a particle reservoir. This research provides insights into the relationship between photon thermalization and laser emission.
Article
Optics
Gautam Hegde, Sandra M. Jose, Rejish Nath
Summary: This study analyzes the dynamics of population and spin densities in spin-1 spinor condensates resulting from the spatial overlap between two distinct polar bright solitons. The findings show that the dynamics of overlapping solitons in scalar condensates display various phenomena such as soliton fusion, atomic switching, and repulsive dynamics. The study also reveals that overlapping polar solitons can emerge as ferromagnetic solitons, oscillatons, or a combination of both in the presence of spin-dependent interactions.
Article
Materials Science, Multidisciplinary
Yu-Xi Xu, Yuan Zhao, Qi-Hong Huang, De-Wei Wang, Zhuo Fan, Li Xue, Si-Liu Xu
Summary: The researchers theoretically investigated the localization of nonlinear matter waves in the PT-symmetric Rydberg atomic BECs system, finding that they can be generated and maintained with stability. Fundamental, higher-order, and vortical solitons were discovered, and their stability was evaluated through numerical simulation and linear-stability analysis. Additionally, the collision of solitons showed a quasi-elastic feature.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Samuel N. Alperin, Natalia G. Berloff
Summary: This paper investigates a generic mechanism of breather formation by simultaneously driving a polariton condensate with both nonresonant and nth order resonant pump frequencies. It constructs a family of exotic breathers with nontrivial discrete order of rotational symmetry for the second order resonance. Furthermore, it demonstrates the spontaneous emergence of crystalline and glassy orderings of lattices of polygonal breathers, depending on the degree of polygonal excitations at the lattice sites.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Juntao He, Ji Lin
Summary: This research explores the existence and stability of stationary and moving bright solitons in spin-orbit-coupled spin-1 Bose-Einstein condensates in the presence of an external Zeeman field. The relation between the bright solitons and the energy spectrum as well as the atomic interactions is investigated. The stability analysis reveals interesting dynamics in the collisions of stable bright solitons with different velocities.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jiaqi Hu, Zhaorong Wang, Seonghoon Kim, Hui Deng, Sebastian Brodbeck, Christian Schneider, Sven Hofling, Nai H. Kwong, Rolf Binder
Summary: By using a microcavity with strong polarization selectivity, researchers observed a fermionic gain mechanism underlying polariton laser, which is consistent with an open-dissipative-pumped system analog of a polaritonic BCS state.
Article
Mathematics, Interdisciplinary Applications
Chunyan Li, Vladimir V. Konotop, Boris A. Malomed, Yaroslav V. Kartashov
Summary: This study reveals the mechanism of linear and nonlinear localization induced by spatially periodic modulation of spin-orbit coupling. It shows that specific chemical potential can lead to localized solitons or vortex solitons, and their stability strongly depends on the potential's location in the gaps.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Alexej Gaidoukov, James R. Anglin
Summary: Gray solitons are one-parameter solutions to the one-dimensional nonlinear Schrodinger equation with positive cubic nonlinearity, found in repulsively interacting dilute Bose-Einstein condensates or electromagnetic waves in waveguides described by Gross-Pitaevskii mean-field theory. Numerical solutions show that these solitons are dynamically unstable to snaking, with the initially straight line undulating with exponentially growing amplitude. An approximate analytical description of the snake instability within Bogoliubov-de Gennes perturbation theory is pursued to assist in future studies of quantum mechanical instability beyond mean-field theory.
Article
Physics, Multidisciplinary
Yuriko Baba, Francisco Dominguez-Adame, Gloria Platero, Rafael A. Molina
Summary: The study focused on the effect and control of Rashba spin-orbit coupling on the Fermi arcs of topological Dirac semimetals. Analyzing the rotation of surface state spins and the spin-dependent two-terminal conductance reveals the potential for spintronic applications in the presence of disorder.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Jose Luis Hernando, Yuriko Baba, Elena Diaz, Francisco Dominguez-Adame
Summary: In this study, we investigate the impact of a random distribution of non-magnetic impurities on the electron states formed at the surface of a topological insulator. By comparing the results obtained from SCBA and CPA methods, we find that the latter provides more accurate predictions regarding the spectral properties of surface states, particularly as disorder magnitude increases.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Carolina Martinez-Strasser, Yuriko Baba, Alvaro Diaz-Fernandez, Francisco Dominguez-Adame
Summary: The study investigates novel spherical core-shell nanoparticles with band inversion, showing robust midgap bound states and the tunability of energy levels through shell thickness. This discovery opens up possibilities for applications in electronics and optoelectronics.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Applied
M. Barroso, J. Balduque, F. Dominguez-Adame, E. Diaz
Summary: This study investigates the thermal effects on spin transport in a deformable helical molecule in the presence of chiral-induced spin-orbit coupling. The carrier-lattice interaction is taken into account using the Peyrard-Bishop-Holstein model, and temperature is introduced as a stochastic noise in the Langevin approach. The results show the existence of two distinct spin-dependent polaron transport regimes as a function of temperature.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Hyoung-In Lee, Christopher Gaul
Summary: We investigate the surface plasmon resonance in a metal-chiral medium interface and compare it with the metal-dielectric interface. The chiral case exhibits either larger or smaller phase speeds compared to the achiral case due to energy redistribution between translation and rotation. In a loss-free system, there are crossovers among dispersion curves and spatial inversions in field profiles, which are associated with anti-symmetric spin flips with respect to medium chirality. The short-wavelength limit establishes an upper bound on medium chirality.
Article
Physics, Multidisciplinary
Dunkan Martinez, Alvaro Diaz-Fernandez, Pedro A. Orellana, Francisco Dominguez-Adame
Summary: Topological superconductors are promising candidates for the search of Majorana zero modes, which are important for quantum computation. It is necessary to study the behavior of electron states in topological superconductors in the presence of magnetic or non-magnetic impurities. The focus is on scattering resonances and spin texture to understand the spin behavior of the electrons. The results show evidence of topological robustness with scattering resonances outside the superconducting gap. Non-trivial and anisotropic spin textures related to the Dzyaloshinskii-Moriya interaction are also discovered, indicating a Ruderman-Kittel-Kasuya-Yosida interaction controlled by Friedel oscillations. These findings are valuable for further investigations on many-point-impurity scattering or impurity potentials with finite range.
ANNALEN DER PHYSIK
(2023)
Article
Physics, Condensed Matter
Christopher Gaul, Santiago Cuesta-Lopez
Summary: Organic semiconductors are ideal for affordable, scalable, and sustainable electronics, LEDs, and solar cells. A machine learning model is developed to accurately and quickly estimate the HOMO and LUMO energies of a given molecular structure, addressing a challenge in finding suitable compounds for organic photovoltaic cells.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yuriko Baba, Mario Amado, Enrique Diez, Francisco Dominguez-Adame, Rafael A. Molina
Summary: This paper proposes a method to freely adjust the Chern number in multilayered structures by applying an external electric field along the stacking direction, overcoming the previous limitation of only being able to tune the Chern number by changing doping concentration or magnetic layer width. By generating new inverted bands and collapsing the previously inverted ones through the presence of an electric field in the stacking direction, the number of Chern states can be externally tuned in the sample without modifying the layers or doping level.
Article
Physics, Fluids & Plasmas
R. P. A. Lima, A. Malyshev
Summary: This study investigates various regimes of charge transfer in DNA using the Peyrard-Bishop-Holstein model. It finds that the polaronic contribution to charge transport is irrelevant due to the instability of the polaron. An alternative fluctuation-governed charge transfer mechanism is proposed, which explains the different charge transfer regimes at different temperatures. Dynamic fluctuations in the vibrational subsystem play a key role in this mechanism.
Article
Materials Science, Multidisciplinary
Irian Sanchez-Ramirez, Yuriko Baba, Leonor Chico, Francisco Dominguez-Adame
Summary: This study investigates the impact of many-body effects on the thermoelectric efficiency of graphene nanoribbons and finds that electron-electron interactions are crucial for enhancing the thermoelectric efficiency. An experimental setup is also proposed to test the validity of the conclusions.
Article
Chemistry, Multidisciplinary
Olga Arroyo-Gascon, Yuriko Baba, Jorge Cerda, Oscar de Abril, Ruth Martinez, Francisco Dominguez-Adame, Leonor Chico
Summary: In this study, we investigate the effects of a non-magnetic impurity located at the surface of the SnTe topological crystalline insulator. We find that doping leads to a shift of the Dirac cones in energy, which strongly depends on the impurity position with respect to the surface. By comparing different geometries, we demonstrate that the surface states remain gapless in the doped semi-infinite system, while a gap opens in the slab geometry.
Proceedings Paper
Education & Educational Research
Yuriko Baba, Elena Diaz, Francisco Dominguez-Adame, Alvaro Diaz-Fernandez
Summary: In an attempt to communicate scientific breakthroughs to a wide audience, media often provide brief summaries of findings, which may not be sufficient for undergraduate students in scientific disciplines. Introducing recent research discoveries in the curriculum can be a complex but beneficial strategy, as students could be influenced by media bias and may benefit from exposure to cutting-edge research in their courses.
7TH INTERNATIONAL CONFERENCE ON HIGHER EDUCATION ADVANCES (HEAD'21)
(2021)
Article
Materials Science, Multidisciplinary
Vivian Torres Vera, Diego Mendez-Gonzalez, Diego J. Ramos-Ramos, Asmae Igalla, Marco Laurenti, Rafael Contreras-Caceres, Enrique Lopez-Cabarcos, Elena Diaz, Jorge Rubio-Retama, Sonia Melle, Oscar G. Calderon
Summary: The study analyzed the effect of Er3+ and Yb3+ dopant concentrations on the luminescence properties of nanoparticles and found that there is a significant increase in luminescence intensity as the Yb/Er ratio increases following a power-law behavior, with greater enhancement at low excitation intensities. Saturation occurs at a Yb/Er ratio of around two, with a slight peak when this ratio is around four.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)