Article
Computer Science, Software Engineering
Igor Krivenko
Summary: libcommute is a C++ template library for manipulating polynomial operators in quantum many-body theory and developing exact diagonalization codes. It provides a simple syntax, extensive documentation, and Python bindings for solving diagonalization problems and rapid prototyping.
Article
Physics, Multidisciplinary
M. Hachmann, Y. Kiefer, J. Riebesehl, R. Eichberger, A. Hemmerich
Summary: In this study, spin-polarized samples and spin mixtures of quantum degenerate fermionic atoms are prepared in selected excited Bloch bands of an optical checkerboard square lattice. The extreme band lifetimes above 10 s for the spin-polarized case reflect the suppression of collisions by Pauli's exclusion principle. The remarkable large values of about 1 s found for spin mixtures demonstrate the basis for exploring the physics of Fermi gases with two paired spin components in orbital optical lattices, including the regime of unitarity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
S. G. Porsev, C. Cheung, M. S. Safronova
Summary: In this study, two different approaches were used to calculate the energies and magnetic dipole hyperfine-structure constants of the low-lying states of 233U+ and 233U. The results were compared and analyzed, providing a preliminary value for the U nuclear magnetic moment and outlining the need for further experiments.
Review
Chemistry, Multidisciplinary
Janus J. Eriksen, Juergen Gauss
Summary: The recent many-body expanded full configuration interaction (MBE-FCI) method is critically assessed, with a discussion on its advantages, drawbacks, history, future research directions, and recent applications.
WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE
(2021)
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
Chemistry, Physical
J. Perez-Rios
Summary: The research focuses on the dynamics of charged impurities in ultracold gas bath and explores the evolution of charged impurities in different baths. It also investigates the impact of external laser sources on the reaction probability and evolution of impurities in ion-neutral hybrid traps.
Article
Multidisciplinary Sciences
Przemyslaw Koscik, Arkadiusz Kuros, Adam Pieprzycki, Tomasz Sowinski
Summary: This study presents a highly accurate variational scheme for describing the ground state of a system of a few ultra-cold bosons confined in one-dimensional traps of arbitrary shapes. The proposed method shows efficiency across a range of intermediate interactions under different external potentials. The results highlight that mutual correlations forced by interactions in generic non-parabolic potentials cannot be captured by distance-dependent functions.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Huanyu Ma, Xincheng Wang, Linxuan Zhang, Zhihan Zou, Junyang Yuan, Yixuan Ma, Rujin Lv, Zhenjie Shen, Tianmin Yan, Matthias Weidemueller, Difa Ye, Yuhai Jiang
Summary: The photoionization process of rubidium atoms cooled in a magneto-optical trap was investigated experimentally and theoretically. The results showed that as the laser intensity increased, the momentum of the Rb+ ions from the 5P3/2 state approached zero, while the peaks from the 5S1/2 state remained unchanged. The ion-yield ratio between the 5S1/2 and 5P3/2 states also varied with laser intensity, indicating a transition from perturbative to strongly perturbative ionization for the 5P3/2 state.
Article
Physics, Multidisciplinary
Thomas P. Billam, Kate Brown, Ian G. Moss
Summary: Cold atomic gases can simulate the physics of the early Universe in the laboratory, with features similar to high energy particle theory. This paper describes a three-level system that undergoes a first-order phase transition through bubble nucleation. Theoretical investigation shows bubbles nucleating in two dimensions at non-zero temperature. The bubble nucleation rates calculated from a stochastic projected Gross-Pitaevskii equation and a non-perturbative instanton method show good agreement. Bubbles preferentially nucleate near the walls of the trap when an optical box trap is included in the simulations.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
O. Hryhorchak, V Pastukhov
Summary: We investigate the equilibrium mean-field properties of a mixture composed of bosons and spin-polarized fermionic atoms in a system with a point-like interaction, where the dimension is between 2 and 4. In addition to the system's weak coupling limit, which involves a slightly depleted Bose condensate and an almost ideal Fermi gas, we discuss the (meta)stable phase characterized by dimers consisting of exactly one boson and one fermion. We elucidate the peculiar characteristics of the fermion-dimer and boson-dimer three-body effective interactions, and their effects on the thermodynamic stability of dilute Bose-Fermi mixtures.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Review
Physics, Multidisciplinary
S. I. Mistakidis, A. G. Volosniev, R. E. Barfknecht, T. Fogarty, Th. Busch, A. Foerster, P. Schmelcher, N. T. Zinner
Summary: Cold atomic gases are a crucial system for exploring fundamental physics and quantum technology applications. This review focuses on few-body cold atom systems confined in low dimensions from a theoretical perspective. The authors discuss recent advances in one-dimensional bosonic systems, including static properties and quantum dynamical processes stimulated by correlations. The review also provides an overview of commonly used calculation and numerical tools and methods, offering a balanced and comprehensive summary of the field. The authors conclude by providing an outlook on future directions for exploration in correlated systems.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Francesco Ferri, Rodrigo Rosa-Medina, Fabian Finger, Nishant Dogra, Matteo Soriente, Oded Zilberberg, Tobias Donner, Tilman Esslinger
Summary: By manipulating the drives and losses of a quantum gas, this study demonstrates the competition between coherent dynamics and dissipation, showcasing the transition between a superradiant phase and a normal phase, as well as the emergence of multistability. The findings provide insights into squeezing in non-Hermitian systems, quantum jumps in superradiance, and dynamical spin-orbit coupling in a dissipative setting.
Article
Physics, Multidisciplinary
Neha Singh, Ruhanshi Barad, Aditya Shweta, Prosenjit Kamalkant, Aditya Choudhary, Prosenjit Majumder, Bodhaditya Santra
Summary: The advancement in single-atom trapping and experimental evolution in cold atom manipulation allows us to explore the physics of few-body systems and its connection with many-body systems. The scattering length plays a crucial role in determining the universality of few-body physics in cold atom experiments. In this study, we numerically investigate the 3-body collision dynamics for Cesium atoms by varying the scattering length using Feshbach resonances. Our findings demonstrate that the probability of one atom remaining in the trap is highest at a specific magnetic field value, leading to the development of high fidelity single atom tweezers for applications in quantum information processing.
Article
Physics, Multidisciplinary
Lucas Madeira, Vanderlei S. Bagnato
Summary: Progress in producing and controlling BECs and degenerate Fermi gases in the past 25 years has led to unprecedented control in cold atom systems. Knowledge acquired from studying cold atom systems can be applied to other fields like nuclear physics and statistical optics, with an understanding of their differences. Comparing cold Fermi gases with nuclear matter and nuclei, as well as connecting BECs and atom lasers through matter-wave character, can enhance our understanding of cold atom systems and related areas.
BRAZILIAN JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Mitchell J. Knight, Harry M. Quiney, Andy M. Martin
Summary: This paper describes the variational determination of the two-fermion reduced density matrix for harmonically trapped, ultracold few-fermion systems in one dimension with equal spin populations. The problem is formulated as a semi-definite program subject to N-representability conditions. The ground-state energies, density, pair-correlation function, and eigenvalues of the 2-RDM are found using an augmented Lagrangian method. The results show that this method accurately describes the salient features of the systems and has the potential to handle larger systems.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Pino D'Amico, Massimo Rontani
Article
Chemistry, Physical
Matteo Barborini, Sandro Sorella, Massimo Rontani, Stefano Corni
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2016)
Article
Optics
Massimo Rontani, G. Eriksson, S. Aberg, S. M. Reimann
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2017)
Article
Physics, Condensed Matter
Karsten Leding Vendelbjerg, Massimo Rontani
SUPERLATTICES AND MICROSTRUCTURES
(2017)
Article
Multidisciplinary Sciences
Daniele Varsano, Sandro Sorella, Davide Sangalli, Matteo Barborini, Stefano Corni, Elisa Molinari, Massimo Rontani
NATURE COMMUNICATIONS
(2017)
Article
Nanoscience & Nanotechnology
Francesco Rossella, Andrea Bertoni, Daniele Ercolani, Massimo Rontani, Lucia Sorba, Fabio Beltram, Stefano Roddaro
NATURE NANOTECHNOLOGY
(2014)
Article
Physics, Multidisciplinary
Joshua O. Island, Marvin Ostermann, Lee Aspitarte, Ethan D. Minot, Daniele Varsano, Elisa Molinari, Massimo Rontani, Gary A. Steele
PHYSICAL REVIEW LETTERS
(2018)
Article
Multidisciplinary Sciences
Lee Aspitarte, Daniel R. McCulley, Andrea Bertoni, Joshua O. Island, Marvin Ostermann, Massimo Rontani, Gary A. Steele, Ethan D. Minot
SCIENTIFIC REPORTS
(2017)
Article
Nanoscience & Nanotechnology
Daniele Varsano, Maurizia Palummo, Elisa Molinari, Massimo Rontani
NATURE NANOTECHNOLOGY
(2020)
Article
Multidisciplinary Sciences
S. Samaneh Ataei, Daniele Varsano, Elisa Molinari, Massimo Rontani
Summary: The spontaneous condensation of excitons, similar to Cooper pairs in superconductors, can potentially lead to a new phase called an excitonic insulator (EI) in semiconductors. At high pressure, bulk MoS2 is shown to be prone to condensation of genuine excitons with finite momentum, while the phonon dispersion remains regular. The EI phase sustains an out-of-plane permanent electric dipole moment with an antiferroelectric texture in the layer plane, providing a unique Raman fingerprint for its formation. Direct spectroscopic confirmation of an ideal excitonic insulator phase in bulk MoS2 above 30 GPa has been achieved through Raman features observed experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Bosong Sun, Wenjin Zhao, Tauno Palomaki, Zaiyao Fei, Elliott Runburg, Paul Malinowski, Xiong Huang, John Cenker, Yong-Tao Cui, Jiun-Haw Chu, Xiaodong Xu, S. Samaneh Ataei, Daniele Varsano, Maurizia Palummo, Elisa Molinari, Massimo Rontani, David H. Cobden
Summary: Evidence shows that monolayer WTe2 contains excitons formed by electrons and holes bound by Coulomb attraction, exhibiting V-shaped dependence on electrostatic doping and step in chemical potential at the neutral point upon cooling. Strong electronic interactions allow excitons to form and condense at high temperature, showing strong correlations over a wide temperature range.
Article
Multidisciplinary Sciences
Angela Montanaro, Francesca Giusti, Matteo Zanfrognini, Paola Di Pietro, Filippo Glerean, Giacomo Jarc, Enrico Maria Rigoni, Shahla Y. Mathengattil, Daniele Varsano, Massimo Rontani, Andrea Perucchi, Elisa Molinari, Daniele Fausti
Summary: The authors investigate the optical response of bulk black phosphorus to mid-infrared pulses, and find that while above-gap excitation leads to a broadband light-induced transparency, sub-gap pulses drive an anomalous response, peaked at the single-layer exciton resonance.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Alberto Guandalini, Pino D'Amico, Andrea Ferretti, Daniele Varsano
Summary: Many-body perturbation theory methods, such as the G(0)W(0) approximation, are accurate in predicting quasiparticle properties of materials, but for 2D semiconductors, calculating the QP band structure requires dense BZ sampling. This work shows a method that combines Monte Carlo integration with interpolation to achieve better convergence of QP corrections for 2D semiconductors.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pino D'Amico, Marco Gibertini, Deborah Prezzi, Daniele Varsano, Andrea Ferretti, Nicola Marzari, Elisa Molinari
Article
Materials Science, Multidisciplinary
Pino D'Amico, Luis Agapito, Alessandra Catellani, Alice Ruini, Stefano Curtarolo, Marco Fornari, Marco Buongiorno Nardelli, Arrigo Calzolari
