Article
Physics, Multidisciplinary
Martin-Isbjorn Trappe, Piotr T. Grochowski, Jun Hao Hue, Tomasz Karpiuk, Kazimierz Rzazewski
Summary: We predict the phase separations of two-dimensional Fermi gases with repulsive contact-type interactions between two spin components. The universal transition from the paramagnetic state at small repulsive interactions toward ferromagnetic density profiles at large interaction strengths is revealed, with intricate particle-number dependent phases in between. Our employed corrections to the bare contact interaction energy and especially to the Thomas-Fermi kinetic energy functional are necessary for reliably predicting properties of trapped mesoscopic Fermi gases.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
S. Pilati, G. Orso, G. Bertaina
Summary: In this study, the ground-state properties of two-component repulsive Fermi gases in two dimensions were investigated using fixed-node diffusion Monte Carlo simulations. The energy per particle, equation of state, and magnetic susceptibility were analyzed for different parameters, revealing the characteristics of polarons and the stability of the ferromagnetic phase. Further analysis is needed to understand the effects of the fixed-node constraint on the results.
Article
Optics
Hikaru Sakakibara, Hiroyuki Tajima, Haozhao Liang
Summary: This study theoretically investigates two-dimensional spin-1/2 fermions with finite-range interactions. Characterizing the attractive interaction in terms of the scattering length and the effective range, the study discusses the effects of finite-range on the ground-state properties in this system.
Article
Materials Science, Multidisciplinary
Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafal Oldziejewski, Richard Schmidt
Summary: We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range on the ground state of the quantum three-body problem. We find that confinement and a finite interaction range can enhance trimer stability and overcome Coulomb repulsion, opening possibilities for electron pairing beyond conventional paradigms.
Article
Chemistry, Multidisciplinary
Koloman Wagner, Zakhar A. Iakovlev, Jonas D. Ziegler, Marzia Cuccu, Takashi Taniguchi, Kenji Watanabe, Mikhail M. Glazov, Alexey Chernikov
Summary: This study demonstrates the diffusion of excitons in a monolayer semiconductor with a continuously tunable Fermi sea of free charge carriers. The light emission from tightly bound exciton states in electrically gated WSe2 monolayer is detected using microscopy. The measurements reveal a nonmonotonic dependence of the exciton diffusion coefficient on the charge carrier density.
Article
Optics
Raul Bombin, Viktor Cikojevic, Juan Sanchez-Baena, Jordi Boronat
Summary: This study focuses on the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms, investigating properties such as polaron energy, quasiparticle residue, and effective mass using the diffusion Monte Carlo method. The results highlight the importance of considering the effective range and scattering length to reproduce experimental results, as well as the establishment of universality through different model potentials for the interaction between the Fermi sea and the impurity. This underscores the significance of quantum fluctuations and beyond mean-field effects in accurately describing the Fermi polaron problem.
Article
Mathematics, Interdisciplinary Applications
Amit Sharma
Summary: This study reports the emergence of explosive synchronization in ensembles of non-identical coupled oscillators using attractive and repulsive mean-field coupling. The role of repulsive mean-field coupling is essential in inducing a first-order transition from incoherent to coherent states, depending on the strength of the coupling and distribution of intrinsic oscillator parameters. The existence of explosive synchronization is numerically studied in the parameter plane using order parameters for limit-cycle oscillators with symmetric and asymmetric distributions in the intrinsic oscillator parameters.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Mathematics, Interdisciplinary Applications
Amit Sharma, Biswambhar Rakshit
Summary: This study investigates the dynamical robustness in a network of oscillators with both attractive and repulsive coupling. The findings reveal complex aging transition dynamics due to the interplay of attractive and repulsive interactions. The aging transition occurs through both homogeneous and inhomogeneous steady states, with discontinuous phase transitions observed in the latter case.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Chemistry, Multidisciplinary
Ciera M. Wentworth, Alexander C. Castonguay, Pepijn G. Moerman, Caleb H. Meredith, Rebecca Balaj, Seong Ik Cheon, Lauren Zarzar
Summary: This study reports emulsions with a behavior opposite to the typical one where solubilization decreases the interfacial tension and leads to droplet attraction. By adjusting the oil chemical structure, nonionic surfactant structure, and surfactant concentration, three regimes corresponding to droplet attraction, repulsion, or inactivity are identified.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Optics
Silas R. Beane, Gianluca Bertaina, Roland C. Farrell, William R. Marshall
Summary: We study the ultracold and weakly coupled Fermi gas in two spatial dimensions using an effective field theory framework. It is found that the universal corrections to the energy density at two orders of interaction strength do not agree with Monte Carlo simulations in the weak-coupling regime. We obtain universal corrections to three orders of interaction strength, which provide agreement between theory and simulation. We also consider the scale ambiguity associated with the renormalization of singular contact interactions, and calculate nonuniversal contributions to the energy density.
Article
Optics
Esben Rohan Christensen, Arturo Camacho-Guardian, Georg M. Bruun
Summary: This study explores the properties of a mobile ion immersed in a quantum degenerate gas of fermionic atoms, revealing distinct characteristics of ionic Fermi polarons compared to neutral polaron. Ionic polarons exhibit multiple stable states and smooth transitions from repulsive to attractive with increasing interaction strength. Interestingly, the residue of the ionic polaron increases with Fermi density, which contrasts with the behavior of neutral polarons.
Article
Physics, Fluids & Plasmas
Sayantan Nag Chowdhury, Sarbendu Rakshit, Javier M. Buldu, Dibakar Ghosh, Chittaranjan Hens
Summary: This article explores the synchronization properties of dynamical systems connected through multiplex architectures, showing the coexistence of intralayer synchronization and antiphase dynamics between coupled systems of different layers. The transition from interlayer antisynchronization to antiphase synchrony in bipartite multiplex architectures is demonstrated, along with the necessary conditions and local stability analysis of the interlayer antisynchronization state.
Article
Physics, Fluids & Plasmas
Xiaoyu Zheng, Obeng Appiagyei Addai, Peter Palffy-Muhoray
Summary: Studying rodlike particles interacting via long-range repulsive potential, it was found that at low temperatures, the particles tend to form stripes with alternating orientations.
Article
Optics
Cheng Peng, Ruijin Liu, Wei Zhang, Xiaoling Cui
Summary: In this study, the physics of Fermi polarons and molecules have been explored using a unified variational Ansatz, confirming the existence of a first-order transition in 3D and 2D Fermi polarons. The nature of this transition is determined by an energy competition between systems with different momenta. Additionally, different variational methods have been used to study the nature of the polaron-molecule transition in 2D systems, with consistent conclusions reached.
Article
Optics
Jonas von Milczewski, Felix Rose, Richard Schmidt
Summary: We study the phase diagram of strongly coupled two-dimensional Bose-Fermi mixtures interacting with attractive short-range potentials as a function of the particle densities. We develop a functional-renormalization-group approach that accounts for the bound-state physics arising from the extended Frohlich Hamiltonian. By including three-body correlations, we reproduce the polaron-to-molecule transition and predict spectral functions and quasiparticle properties. We find that at finite boson density, fermions and bosons can form a fermionic composite with a well-defined Fermi surface, and as the boson density increases, there is a transition into a strongly correlated phase.
Article
Physics, Multidisciplinary
Eugenio Cocchi, Luke A. Miller, Jan H. Drewes, Marco Koschorreck, Daniel Pertot, Ferdinand Brennecke, Michael Koehl
PHYSICAL REVIEW LETTERS
(2016)
Article
Physics, Multidisciplinary
Lothar Ratschbacher, Christoph Zipkes, Carlo Sias, Michael Koehl
Article
Physics, Multidisciplinary
Marco Koschorreck, Daniel Pertot, Enrico Vogt, Michael Koehl
Article
Physics, Multidisciplinary
M. W. Mitchell, M. Koschorreck, M. Kubasik, M. Napolitano, R. J. Sewell
NEW JOURNAL OF PHYSICS
(2012)
Article
Optics
Stefan K. Baur, Bernd Froehlich, Michael Feld, Enrico Vogt, Daniel Pertot, Marco Koschorreck, Michael Koehl
Article
Physics, Multidisciplinary
B. Dubost, M. Koschorreck, M. Napolitano, N. Behbood, R. J. Sewell, M. W. Mitchell
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Multidisciplinary
B. Froehlich, M. Feld, E. Vogt, M. Koschorreck, M. Koehl, C. Berthod, T. Giamarchi
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Multidisciplinary
Matthias Steiner, Hendrik M. Meyer, Christian Deutsch, Jakob Reichel, Michael Koehl
PHYSICAL REVIEW LETTERS
(2013)
Article
Physics, Multidisciplinary
D. Pertot, A. Sheikhan, E. Cocchi, L. A. Miller, J. E. Bohn, M. Koschorreck, M. Koehl, C. Kollath
PHYSICAL REVIEW LETTERS
(2014)
Article
Optics
William Telford, Lynn Strickland, Marco Koschorreck
Article
Biochemical Research Methods
William Telford, Lynn Stickland, Marco Koschorreck
Proceedings Paper
Physics, Nuclear
Morgan W. Mitchell, R. J. Sewell, M. Napolitano, M. Koschorreck, B. Dubost, N. Behbood, M. Kubasik
ICAP 2012 - 23RD INTERNATIONAL CONFERENCE ON ATOMIC PHYSICS
(2013)
Proceedings Paper
Engineering, Electrical & Electronic
Naeimeh Behbood, Mario Napolitano, Giorgio Colangelo, Brice Dubost, Silvana Palacios Alvarez, Robert J. Sewell, Geza Toth, Morgan W. Mitchell
2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2012)