Article
Materials Science, Multidisciplinary
Alexander N. Poddubny
Summary: We conducted a theoretical study on the quantum states of two repelling spinless particles in a one-dimensional tight-binding model with a simple periodic lattice and open boundary conditions. Our research revealed that the interaction between the particles can drive nontrivial correlated two-particle states, such as bound states and edge states, and induce interaction-induced flat bands. We also found that the localization of the center of mass of the two particles enforces the localization of their relative motion, leading to the formation of bound states. Furthermore, we explored the properties of the bound states using an approximate effective non-Hermitian model for the relative motion that exhibits the non-Hermitian skin effect.
Article
Physics, Multidisciplinary
W. Rodriguez-Cruz, J. C. Torres-Guzman, A. Diaz-de-Anda
Summary: By introducing a gradient in the length distribution of N weakly coupled beams, the elastic equivalent of the Wannier-Stark ladder is obtained in a system governed by two coupled second-degree differential equations, occurring from the third band of states onwards, unlike other classical systems.
Article
Multidisciplinary Sciences
Mahmut S. Kavrik, Jordan A. Hachtel, Wonhee Ko, Caroline Qian, Alex Abelson, Eyup B. Unlu, Harshil Kashyap, An-Ping Li, Juan C. Idrobo, Matt Law
Summary: This study demonstrates the emergence of distinct local electronic states induced by crystalline necks in self-assembled quantum dot superlattices. The bandgap modulation at the necks is shown through multi-probe scanning tunneling spectroscopy and monochromated electron energy-loss spectroscopy. The results suggest the modification of the electronic structure of nanoscale superlattices, which may have potential applications in optoelectronics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Nicolo Crescini, Samuel Cailleaux, Wiebke Guichard, Cecile Naud, Olivier Buisson, Kater W. Murch, Nicolas Roch
Summary: The modern primary voltage standard is based on the a.c. Josephson effect and the ensuing Shapiro steps, where a microwave tone applied to a Josephson junction yields a constant voltage hf/2e determined by only the microwave frequency f, Planck's constant h and the electron charge e.
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
Optics
J. Ramya Parkavi, V. K. Chandrasekar, M. Lakshmanan
Summary: This study investigates the stable Bloch oscillations and Landau-Zener tunneling in a non-Hermitian system exposed to external fields. Complex dispersive bands were found to be isolated in both flat-band and non-flat-band cases, potentially enabling Bloch oscillations induced by a synthetic electric field and leading to amplified Bloch oscillations for controlling transport phenomena in non-Hermitian systems.
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
Materials Science, Multidisciplinary
Rafael Sanchez, Cosimo Gorini, Genevieve Fleury
Summary: This study investigates the thermoelectric response of a coherent conductor in contact with a scanning probe, observing a multiterminal thermoelectric effect and a thermoelectric diode effect. By considering a simple model for noninteracting electrons, nonlocal and nonreciprocal responses are found, modulated by the position of the hot probe tip.
Article
Optics
Truong X. Tran, Hue M. Nguyen, Dung C. Duong
Summary: In this paper, we simulate the optical analogs of the relativistic quantum electron-positron dynamic pair production and annihilation processes in a binary waveguide array consisting of straight and curved sections. The results show excellent agreement between the discrete model based on binary waveguide arrays and the truly continuous Dirac equation in quantum field theory, in terms of the probabilities of these two processes.
Article
Optics
Zoran Ristivojevic
Summary: We study the polaron quasiparticle in a one-dimensional Bose gas using the Yang-Gaudin model, deriving an exact result for the polaron mass in the thermodynamic limit. The polaron mass is expressed in terms of the derivative with respect to the density of the ground-state energy per particle of the Bose gas without the polaron, allowing for high-order power series calculations in weak and strong interaction regimes.
Article
Materials Science, Multidisciplinary
Bhilahari Jeevanesan, Claudio Benzoni, Sergej Moroz
Summary: This study examines collective normal modes of a finite disk-shaped two-dimensional vortex crystal in a compressible bosonic superfluid in an artificial magnetic field. The findings include chiral surface waves propagating at frequencies higher than bulk Tkachenko modes, low frequency bulk excitations, and a Ruderman mode that is well described by a developed low-energy effective field theory.
Article
Materials Science, Multidisciplinary
X. Z. Zhang, Z. Song
Summary: Quenching has emerged as a transformative tool for evolving quantum systems into nonequilibrium phases. In strongly correlated systems, it can significantly alter the microscopic behavior and manifest interesting phenomena. We demonstrate the induction of a nonequilibrium steady conducting state from the deep Mott insulating phase using a staggered magnetic field, showing the potential of electron-electron correlation and modulated external fields to access new exotic quantum states.
Article
Optics
Stefano Longhi
Summary: This article discusses the differences in particle behavior in unbounded potentials between classical mechanics and wave mechanics, and introduces a new class of unbounded potentials where wave delocalization is observed. Experimental verification of this phenomenon is done through light dynamics in synthetic photonic lattices.
Article
Multidisciplinary Sciences
Robin Huber, Max-Niklas Steffen, Martin Drienovsky, Andreas Sandner, Kenji Watanabe, Takashi Taniguchi, Daniela Pfannkuche, Dieter Weiss, Jonathan Eroms
Summary: In this study, band conductivity oscillations in a graphene superlattice were experimentally observed. These oscillations are governed by the internal structure of the Hofstadter butterfly (Brown-Zak oscillations) and a commensurability relation between the electron cyclotron radius and the superlattice period (Weiss oscillations). A complete description of the oscillations in two-dimensional superlattices was obtained, showing a detailed match between theory and experiment.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Luca Naponiello, Luigi Mancini, Alessandro Sozzetti, Aldo S. Bonomo, Alessandro Morbidelli, Jingyao Dou, Li Zeng, Zoe M. Leinhardt, Katia Biazzo, Patricio E. Cubillos, Matteo Pinamonti, Daniele Locci, Antonio Maggio, Mario Damasso, Antonino F. Lanza, Jack J. Lissauer, Karen A. Collins, Philip J. Carter, Eric L. N. Jensen, Andrea Bignamini, Walter Boschin, Luke G. Bouma, David R. Ciardi, Rosario Cosentino, Silvano Desidera, Xavier Dumusque, Aldo F. M. Fiorenzano, Akihiko Fukui, Paolo Giacobbe, Crystal L. Gnilka, Adriano Ghedina, Gloria Guilluy, Avet Harutyunyan, Steve B. Howell, Jon M. Jenkins, Michael B. Lund, John F. Kielkopf, Katie V. Lester, Luca Malavolta, Andrew W. Mann, Rachel A. Matson, Elisabeth C. Matthews, Domenico Nardiello, Norio Narita, Emanuele Pace, Isabella Pagano, Enric Palle, Marco Pedani, Sara Seager, Joshua E. Schlieder, Richard P. Schwarz, Avi Shporer, Joseph D. Twicken, Joshua N. Winn, Carl Ziegler, Tiziano Zingales
Summary: Neptune-sized planets exhibit diverse compositions and densities, which are influenced by factors such as their distance from the host stars and atmospheric escape processes. TOI-1853 b, a planet in the hot-Neptune desert, has a mass almost twice that of any other Neptune-sized planet known so far and a high density dominated by heavy elements. The properties of TOI-1853 b challenge conventional theories of planetary formation and evolution and could be the result of multiple proto-planet collisions or the final state of a planet that migrated closer to its parent star.
Article
Multidisciplinary Sciences
Matthew A. Norcia, Claudia Politi, Lauritz Klaus, Elena Poli, Maximilian Sohmen, Manfred J. Mark, Russell N. Bisset, Luis Santos, Francesca Ferlaino
Summary: Supersolid states combine properties of solids and superfluids, initially envisioned in solid helium but observed in ultracold atomic gases. The extension of supersolid properties into two dimensions using dysprosium atoms opens up the possibility of studying rich excitation properties.
Article
Physics, Multidisciplinary
Maximilian Sohmen, Claudia Politi, Lauritz Klaus, Lauriane Chomaz, Manfred J. Mark, Matthew A. Norcia, Francesca Ferlaino
Summary: In this study, the finite-temperature properties of dipolar supersolids formed by cooling through direct evaporation were explored. The research revealed that as the atomic system cools towards quantum degeneracy, it transitions from a thermal gas to a crystalline state with periodic density modulation, followed by a transition to a supersolid state with long-range phase coherence.
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
Cell Biology
Carlo Emanuele Villa, Cristina Cheroni, Christoph P. Dotter, Alejandro Lopez-Tobon, Barbara Oliveira, Roberto Sacco, Aysan Cerag Yahya, Jasmin Morandell, Michele Gabriele, Mojtaba R. Tavakoli, Julia Lyudchik, Christoph Sommer, Mariano Gabitto, Johann G. Danzl, Giuseppe Testa, Gaia Novarino
Summary: Mutations in the CHD8 gene are a common cause of autism spectrum disorder. This study used human cerebral organoids to investigate the effects of CHD8 haploinsufficiency on neurodevelopment. The researchers found that CHD8 haploinsufficiency disrupted the generation of inhibitory and excitatory neurons, resulting in an imbalance in their proportions. By studying genotype-phenotype relationships and cell-autonomous nature, the study identified cell-type-specific molecular defects associated with CHD8 mutations.
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
Multidisciplinary Sciences
Yoav Ben-Simon, Karola Kaefer, Philipp Velicky, Jozsef Csicsvari, Johann G. Danzl, Peter Jonas
Summary: The mammalian hippocampal formation is crucial for higher brain functions and a recent study has revealed the role of excitatory neurons in layer 6b of the mouse EC in this process. These neurons project to all sub-regions of the hippocampal formation and receive input from different brain regions. Their output is characterized by slow-decaying excitatory postsynaptic currents, which can drive plateau-like potentials in their target cells. The inhibition of the EC-6b pathway affects spatial coding and cell ablation impairs the formation and degradation of spatial memories.
NATURE COMMUNICATIONS
(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
Multidisciplinary Sciences
Paul Schroff, Arthur La Rooij, Elmar Haller, Stefan Kuhr
Summary: Arbitrary light potentials are generated using a spatial light modulator (SLM) to simulate light propagation, reducing experimental errors and improving accuracy and efficiency of the light potentials.
SCIENTIFIC REPORTS
(2023)
Article
Instruments & Instrumentation
Mateusz Borkowski, Lukas Reichsollner, Premjith Thekkeppatt, Vincent Barbe, Tijs van Roon, Klaasjan van Druten, Florian Schreck
Summary: A magnetic field control system is developed to achieve magnetic field control of over 1000 G with ppm-level precision in ultracold-atom experiments. By combining a battery-powered, current-stabilized power supply with active feedback stabilization of the magnetic field using fluxgate magnetic field sensors, microwave spectroscopy of ultracold Rb atoms is performed. The magnetic field stability is demonstrated to be 2.4(3) mG at 1050 G [2.3(3) ppm relative] based on the spectral feature.
REVIEW OF SCIENTIFIC INSTRUMENTS
(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)
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. 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)
Article
Optics
D. Petter, A. Patscheider, G. Natale, M. J. Mark, M. A. Baranov, R. van Bijnen, S. M. Roccuzzo, A. Recati, B. Blakie, D. Baillie, L. Chomaz, F. Ferlaino
Summary: The response of a dipolar supersolid to Bragg excitation was studied experimentally and theoretically, revealing that the phase dynamics induced by phase transition significantly affect the response speed. The discrepancy between experiments and theories was attributed to coherent phase variations along the phase diagram.
