Article
Physics, Multidisciplinary
Thomas Kohlert, Sebastian Scherg, Pablo Sala, Frank Pollmann, Bharath Hebbe Madhusudhana, Immanuel Bloch, Monika Aidelsburger
Summary: Intriguingly, quantum many-body systems can exhibit nonergodic behavior even in the absence of disorder. The tilted one-dimensional Fermi-Hubbard model is shown to naturally realize distinct effective Hamiltonians that support nonergodic behavior due to fragmentation. The observed dynamics in experimentally accessible parameter ranges suggest a pronounced dependence of the relaxation dynamics on the initial doublon fraction, revealing the microscopic processes of the fragmented model. These findings are significant for future studies of nonergodic behavior in higher dimensions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xingbo Wei, Xianlong Gao, W. Zhu
Summary: We investigate the behavior of hard-core bosons in a lattice chain with a weak linear potential. We find that the critical point of dynamical Stark localization differs from that of static Stark localization in the single-particle case, suggesting the presence of an intermediate phase where the eigenstates are localized but the dynamic wave functions are extended after quenching. When considering many-body interactions, we observe a similar intermediate phase and study both the static transition for the ground state and the dynamical transition for domain-wall states.
Article
Quantum Science & Technology
Amir H. Karamlou, Jochen Braumuller, Yariv Yanay, Agustin Di Paolo, Patrick M. Harrington, Bharath Kannan, David Kim, Morten Kjaergaard, Alexander Melville, Sarah Muschinske, Bethany M. Niedzielski, Antti Vepsalainen, Roni Winik, Jonilyn L. Yoder, Mollie Schwartz, Charles Tahan, Terry P. Orlando, Simon Gustavsson, William D. Oliver
Summary: In this study, quantum transport and localization phenomena in tight-binding lattices are experimentally investigated using a controlled array of superconducting qubits, showing quantitative agreement with theoretical predictions and numerical simulations.
NPJ QUANTUM INFORMATION
(2022)
Article
Chemistry, Multidisciplinary
Sergio de-la-Huerta-Sainz, Angel Ballesteros, Nicolas A. Cordero
Summary: Graphene nanostructures have unconventional properties that have attracted significant attention. In this study, Density Functional Theory was used to investigate the mechanical and electronic properties of curved graphene nanoflakes. Different boundary conditions were applied to relaxed hexagonal flakes, and the behavior of curvature energy and quantum regeneration times were analyzed as the radius of the spherical sector changed. The occurrence of a divergence in the revival time suggests a possible phase transition caused by the pseudomagnetic field generated by the curvature, which may be the first case of a phase transition in graphene nanostructures without external electric or magnetic fields.
Article
Physics, Multidisciplinary
Giuseppe Del Vecchio Del Vecchio, Andrea De Luca, Alvise Bastianello
Summary: This article investigates the chaotic dynamics induced by a localized defect in 1D integrable systems, and studies the non-thermal transport properties using numerical simulations and solutions of the Boltzmann equation.
Article
Physics, Multidisciplinary
Jaksa Vucicevic, Rok Zitko
Summary: By using dynamical mean field theory, the magnetic field dependence of dc conductivity in the Hubbard model on the square lattice was investigated, revealing novel oscillatory effects at elevated temperature which are in line with recent experiments on graphene superlattices. The study elucidated the key roles of off-diagonal elements of the current vertex and the incoherence of electronic states in explaining trends with respect to temperature and doping.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Zhongkai Huang, Alejandro D. Somoza, Cheng Peng, Jin Huang, Maolin Bo, Chuang Yao, JiBiao Li, Guankui Long
Summary: Recent developments in qubit engineering have made circuit quantum electrodynamics devices promising candidates for studying Bloch oscillations and Landau-Zener transitions. This work investigates Bloch-Zener oscillations using a hybrid circuit chain with alternating site energies, coupled with dispersionless optical phonons. The study reveals the significant role of band gaps in tuning wave patterns and time periodic reconstructions in the presence of qubit-phonon interactions.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
L. Absil, Y. Balland, F. Pereira Dos Santos
Summary: We present a method for transporting ultracold atoms over macroscopic distances and recapturing them in a vertical mixed trap. The trap consists of a vertical lattice and a transverse confinement beam. Transport is achieved using Bloch oscillations, allowing for up to 25% atom displacement.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Sebastian Scherg, Thomas Kohlert, Pablo Sala, Frank Pollmann, Bharath Hebbe Madhusudhana, Immanuel Bloch, Monika Aidelsburger
Summary: This study investigates non-ergodic dynamics in a tilted optical lattice, revealing long-lived initial-state memory attributed to emergent kinetic constraints. Through experiments and numerical simulations, a detailed microscopic understanding of this behavior is provided, suggesting the possibility of complex thermalizing behavior in the absence of disorder in many-body systems.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Jorge I. Facio, Elisabetta Nocerino, Ion C. Fulga, Rafal Wawrzynczak, Joanna Brown, Genda Gu, Qiang Li, Martin Mansson, Yasmine Sassa, Oleh Ivashko, Martin Zimmermann, Felix Mende, Johannes Gooth, Stanislaw Galeski, Jeroen van den Brink, Tobias Meng
Summary: Real-world topological semimetals typically have both Dirac and Weyl nodes along with trivial Fermi pockets. By studying ZrTe5, we demonstrate that strain can be used to tune the band structure and push all trivial pockets far away from the Fermi energy, but only within a certain range of Van der Waals gaps. This resolves conflicting reports on the presence of additional pockets in ZrTe5 and provides a clear map of where to find a pure three-dimensional Dirac semimetallic phase in the material's structural parameter space.
Article
Materials Science, Multidisciplinary
Hiroki Ikegami, Yasunobu Nakamura
Summary: This research presents experimental investigations of transport properties in the insulating phase of two-dimensional Josephson-junction arrays (JJAs). The results indicate that the JJAs exhibit nonlinear current-voltage characteristics at low temperatures, and the crossover temperature to the insulating phase and the phase diagram in the insulating side are determined through the analysis of nonlinearity.
Article
Materials Science, Multidisciplinary
Titas Chanda, Jakub Zakrzewski
Summary: In this study, many-body localization (MBL) features are explored in a large spin chain model with long-range interactions. The model represents cold atoms inside a cavity driven by an external laser field, where long-range interactions originate from rescattering of cavity photons. Previous studies were limited to small system sizes that could be exactly diagonalized. By utilizing tensor network algorithms, nonergodic features and MBL are demonstrated to exist in this model for random disorder and in the presence of a tilted potential, even for system sizes relevant to experiments.
Article
Physics, Multidisciplinary
Etienne Granet
Summary: We construct a family of Hermitian potentials in 1D quantum mechanics that converge to a delta interaction with an energy-dependent coupling in the zero-range limit. These pointlike interactions can be used to create potentials with a finite support and energy-dependent coupling.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Zhi-Wei Jia, Li Li, Yi-Yan Guo, An-Bang Wang, Hong Han, Jin-Chuan Zhang, Pu Li, Shen-Qiang Zhai, Feng-Qi Liu
Summary: In this study, the dynamic states of mutual-coupled mid-infrared quantum cascade lasers were investigated numerically in the parameter space of injection strength and detuning frequency. Various types of period-one states and dynamic behaviors such as square-wave, quasi-period, pulse-burst, and chaotic oscillations were observed.
Article
Physics, Multidisciplinary
K. Gotze, M. J. Pearce, M. J. Coak, P. A. Goddard, A. D. Grockowiak, W. A. Coniglio, S. W. Tozer, D. E. Graf, M. B. Maple, P-C Ho, M. C. Brown, J. Singleton
Summary: CeOs4Sb12, a member of the skutterudite family, exhibits an unusual semimetallic low-temperature L-phase. The influence of pressure on the different H-T phase boundaries in CeOs4Sb12 was investigated through electrical transport and megahertz conductivity measurements. The results showed changes in properties such as the decrease in Fermi surface size and marginal suppression of the low-temperature phase under high pressure.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
P. Ilzhoefer, M. Sohmen, G. Durastante, C. Politi, A. Trautmann, G. Natale, G. Morpurgo, T. Giamarchi, L. Chomaz, M. J. Mark, F. Ferlaino
Summary: The study investigates the response of dipolar supersolids to interaction quenches, finding a parameter regime where the out-of-equilibrium state rephases before gradually relaxing into an incoherent droplet array. Collective mode excitations caused by the interaction quench connect to phonons in solids and affect the phase dynamics.
Article
Physics, Multidisciplinary
T. Dieterle, M. Berngruber, C. Hoelzl, R. Loew, K. Jachymski, T. Pfau, F. Meinert
Summary: The study investigates the transport dynamics of a single low-energy ionic impurity in a Bose-Einstein condensate by implanting the impurity using fast electric field pulses. The results show diffusive transport properties of the impurity and allow for the measurement of its mobility through comparison with simulations. This research opens up a new path for studying dynamics of charged quantum impurities in ultracold matter.
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
G. Unnikrishnan, C. Beulenkamp, D. Zhang, K. P. Zamarski, M. Landini, H-C Naegerl
Summary: A compact and robust setup for optically transporting ultracold atoms over long distances is presented using a focus-tunable moire lens. The moire lens demonstrates superior thermal stability and low astigmatism, achieving a transfer efficiency of 70% with negligible temperature change. Compared to fluid-based varifocal lenses, the moire lens is more compact and stable, allowing for simplified experimental setups.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Multidisciplinary Sciences
Nicolas Zuber, Viraatt S. V. Anasuri, Moritz Berngruber, Yi-Quan Zou, Florian Meinert, Robert Loew, Tilman Pfau
Summary: Researchers have discovered a new type of molecular ion based on the interaction between the ionic charge and a flipping-induced dipole of a highly excited electron, called Rydberg atom. This molecular ion has a bond length of several micrometres. Using a high-resolution ion microscope, they have measured the vibrational spectrum and spatially resolved the bond length and angular alignment of the molecule. Due to the large bond length, the molecular dynamics are extremely slow.
Article
Physics, Multidisciplinary
S. Tiwari, F. Engel, M. Wagner, R. Schmidt, F. Meinert, S. Wuster
Summary: Recent experiments with Bose-Einstein condensates have investigated the quantum-many-body dynamics of atoms moving within the Rydberg atom. The study focused on the effects of the electron-atom interaction potential and found that it is crucial for the initial condensate response within the Rydberg orbit but becomes less relevant for the density waves at later times. The local dynamics of condensate heating was also explored and was found to provide only minor corrections to the mean-field dynamics. Overall, the results suggest that Bose-Einstein condensates can be used to study ultra-cold chemistry dynamics involving Rydberg states.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Matthew A. Norcia, Elena Poli, Claudia Politi, Lauritz Klaus, Thomas Bland, Manfred J. Mark, Luis Santos, Russell N. Bisset, Francesca Ferlaino
Summary: Angular oscillations can serve as a useful probe for superfluid properties, but in systems with 2D structure, the frequency of angular oscillations remains nearly unchanged even with significant alterations in superfluidity, suggesting that they may not always provide a robust experimental probe for superfluidity with typical experimental protocols.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Lauritz Klaus, Thomas Bland, Elena Poli, Claudia Politi, Giacomo Lamporesi, Eva Casotti, Russell N. Bisset, Manfred J. Mark, Francesca Ferlaino
Summary: This study investigates the phenomenon of quantized vortices in ultracold gases composed of lanthanide atoms, utilizing manipulation of atoms and rotating external magnetic fields.
Article
Physics, Multidisciplinary
Gabriele Natale, Thomas Bland, Simon Gschwendtner, Louis Lafforgue, Daniel S. Grun, Alexander Patscheider, Manfred J. Mark, Francesca Ferlaino
Summary: Three-dimensional quantum gases of strongly dipolar atoms can exhibit a transition from a dilute gas to a dense macrodroplet. In this study, a one-dimensional optical lattice is used to explore the role of quantum fluctuations and observe different phases. The results show the presence of macrodroplets extended over several lattice sites and a transition to a state localized to a single lattice plane. A numerical model is developed to explain the experimental observations, revealing the characteristics of different types of macrodroplets and a two-dimensional soliton.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yi-Quan Zou, Moritz Berngruber, Viraatt S. V. Anasuri, Nicolas Zuber, Florian Meinert, Robert Loew, Tilman Pfau
Summary: Vibrational dynamics in conventional molecules usually occur on a picosecond or shorter timescale. However, ultralong-range Rydberg molecules exhibit dramatically slowed down dynamics due to their large bond length of up to several micrometers. In this study, we directly observe the vibrational dynamics of a recently discovered Rydberg-atom-ion molecule. By applying a weak external electric field, we are able to control the molecule's orientation and induce vibrational dynamics. Our research opens up opportunities for controlling molecular dynamics in Rydberg molecules.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Sergi Julia-Farre, Daniel Gonzalez-Cuadra, Alexander Patscheider, Manfred J. Mark, Francesca Ferlaino, Maciej Lewenstein, Luca Barbiero, Alexandre Dauphin
Summary: This paper investigates the topological properties of the bond order wave phase in the extended Fermi-Hubbard model. For an infinite system, the bond order wave regime is characterized by two degenerate bulk states corresponding to trivial and topological sectors. By imposing a suitable boundary potential, the topological sector can be stabilized in finite-size systems, providing a concrete protocol for observing the topologically protected degenerate edge modes. The bulk of the system is characterized by exotic solitonic solutions interpolating between trivial and topological sectors.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Alice Pagano, Sebastian Weber, Daniel Jaschke, Tilman Pfau, Florian Meinert, Simone Montangero, Hans Peter Buechler
Summary: We study the implementation of a high-fidelity controlled-phase gate in a Rydberg quantum computer. By optimizing the pulse shapes, we are able to reduce the gate infidelity and analyze the influence of fundamental error sources in an experimentally realistic setup. The results show that achieving high gate fidelity is possible.
PHYSICAL REVIEW RESEARCH
(2022)
Review
Optics
A. Patscheider, L. Chomaz, G. Natale, D. Petter, M. J. Mark, S. Baier, B. Yang, R. R. W. Wang, J. L. Bohn, F. Ferlaino
Summary: Accurate knowledge of the scattering length is crucial in ultracold quantum gas experiments. In this study, we carefully characterized the s-wave scattering length for erbium isotopes and compared it with theoretical models using cross-dimensional thermalization measurements and numerical simulations. We also observed a dependence of the number of collisions per rethermalization on density, which might be due to deviations from an ideal harmonic trapping configuration.
Article
Optics
C. Politi, A. Trautmann, P. Ilzhoefer, G. Durastante, M. J. Mark, M. Modugno, F. Ferlaino
Summary: In this study, the influence and control of dipole-dipole interactions (DDIs) on the total interspecies interaction in an erbium-dysprosium mixture were experimentally and theoretically investigated. By rotating the dipole orientation, the effect of the long-range and anisotropic DDI on the in-trap displacements of the erbium and dysprosium clouds was tuned. A theoretical description based on an extended Gross-Pitaevskii theory was presented for the binary system, including beyond mean-field terms for the single-species. Lower and upper bounds for the interspecies scattering length were predicted. This research is significant for exploring the experimentally unexplored dipolar miscibility-immiscibility phase diagram and realizing quantum droplets and supersolid states with heteronuclear dipolar mixtures.
Article
Physics, Multidisciplinary
A. Patscheider, B. Yang, G. Natale, D. Petter, L. Chomaz, M. J. Mark, G. Hovhannesyan, M. Lepers, F. Ferlaino
Summary: The study reports on observing and exciting atoms on a specific narrow inner-shell orbital transition, measuring amplitudes and frequency shifts through high-resolution spectroscopy, demonstrating coherent control, and determining atomic lifetimes. The experimental results are in good agreement with the theoretical model and propose possible magic-wavelength conditions.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
A. Trautmann, M. J. Mark, P. Ilzhoefer, H. Edri, A. El Arrach, J. G. Maloberti, C. H. Greene, F. Robicheaux, F. Ferlaino
Summary: This study investigates the Rydberg spectrum in Er-166 and identifies approximately 550 individual states, with good agreement with a multichannel quantum defect theory. The results provide improved accuracy for the lowest two ionization thresholds and quantum defects for all observed series, opening the way for future applications of Rydberg states for quantum simulation.
PHYSICAL REVIEW RESEARCH
(2021)
