TY - JOUR AB - We perform numerical simulations to study self-assembly of nanoparticles mediated by an elastic planar surface. We show how the nontrivial elastic response to deformations of these surfaces leads to anisotropic interactions between the particles resulting in aggregates having different geometrical features. The morphology of the patterns can be controlled by the mechanical properties of the surface and the strength of the particle adhesion. We use simple scaling arguments to understand the formation of the different structures, and we show how the adhering particles can cause the underlying elastic substrate to wrinkle if two of its opposite edges are clamped. Finally, we discuss the implications of our results and suggest how elastic surfaces could be used in nanofabrication. AU - Šarić, Anđela AU - Cacciuto, Angelo ID - 10389 IS - 18 JF - Soft Matter KW - condensed matter physics KW - general chemistry SN - 1744-683X TI - Soft elastic surfaces as a platform for particle self-assembly VL - 7 ER - TY - JOUR AB - We present experimentally derived potential curves 1?and spin-orbit interaction functions for the strongly perturbed AΣu+ 3?and bΠu states of the cesium dimer. The results are based on data from several sources. Laser-induced fluorescence Fourier transform spectroscopy (LIF FTS) was used some time ago in the Laboratoire Aimé Cotton primarily to study the XΣg+ state. More recent work at Tsinghua University provides information from moderate 3?resolution spectroscopy on the lowest levels of the bΠ0u± state as well as additional high-resolution data. From Innsbruck University, we have precision data obtained with cold Cs2 molecules. Recent data from Temple University was obtained using the optical-optical double resonance polarization spectroscopy technique, and finally, a group at the University of Latvia has added additional LIF FTS data. In the Hamiltonian matrix, we have used analytic potentials (the expanded Morse oscillator form) with both finite-difference (FD) coupled-channel and discrete variable representation (DVR) calculations of the term values. Fitted diagonal and off-diagonal spin-orbit functions are obtained and compared with ab initio results from Temple and Moscow State universities. AU - Bai, Jianmei AU - Ahmed, Ergin AU - Beser, Bediha AU - Guan, Yafei AU - Kotochigova, Svetlana AU - Lyyra, Marjatta AU - Ashman, Seth AU - Wolfe, Christopher AU - Huennekens, John AU - Xie, Feng AU - Li, Dan AU - Li, Li AU - Tamanis, Maris AU - Ferber, Ruvin AU - Drozdova, Anastasia AU - Pazyuk, Elena AU - Stolyarov, Andrey AU - Danzl, Johann G AU - Nägerl, Hanns AU - Bouloufa, Nadia AU - Dulieu, Olivier AU - Amiot, Claude AU - Salami, Houssam AU - Bergeman, Thomas ID - 1050 IS - 3 JF - Physical Review A - Atomic, Molecular, and Optical Physics TI - Global analysis of data on the spin-orbit-coupled A 1Σu+ and b 3Πu inf states of Cs2 VL - 83 ER - TY - JOUR AB - We produce an ultracold and dense sample of rovibronic ground state Cs 2 molecules close to the regime of quantum degeneracy, in a single hyperfine level, in the presence of an optical lattice. The molecules are individually trapped, in the motional ground state of an optical lattice well, with a lifetime of 8 s. For preparation, we start with a zero-temperature atomic Mott-insulator state with optimized double-site occupancy and efficiently associate weakly-bound dimer molecules on a Feshbach resonance. Despite extremely weak Franck-Condon wavefunction overlap, the molecules are subsequently transferred with >50% efficiency to the rovibronic ground state by a stimulated four-photon process. Our results present a crucial step towards the generation of Bose-Einstein condensates of ground-state molecules and, when suitably generalized to polar heteronuclear molecules such as RbCs, the realization of dipolar many-body quantum-gas phases in periodic potentials. AU - Nägerl, Hanns AU - Mark, Manfred AU - Haller, Elmar AU - Gustavsson, Mattias AU - Hart, Russell AU - Danzl, Johann G ID - 1048 IS - 1 JF - Journal of Physics: Conference Series TI - Ultracold and dense samples of ground-state molecules in lattice potentials VL - 264 ER - TY - JOUR AB - The present paper aims at finding optimal parameters for trapping of Cs 2 molecules in optical lattices, with the perspective of creating a quantum degenerate gas of ground-state molecules. We have calculated dynamic polarizabilities of Cs 2 molecules subject to an oscillating electric field, using accurate potential curves and electronic transition dipole moments. We show that for some particular wavelengths of the optical lattice, called "magic wavelengths", the polarizability of the ground-state molecules is equal to the one of a Feshbach molecule. As the creation of the sample of ground-state molecules relies on an adiabatic population transfer from weakly-bound molecules created on a Feshbach resonance, such a coincidence ensures that both the initial and final states are favorably trapped by the lattice light, allowing optimized transfer in agreement with the experimental observation. AU - Vexiau, Romain AU - Bouloufa, Nadia AU - Aymar, Mireille AU - Danzl, Johann G AU - Mark, Manfred AU - Nägerl, Hanns AU - Dulieu, Olivier ID - 1052 IS - 1-2 JF - European Physical Journal D TI - Optimal trapping wavelengths of Cs 2 molecules in an optical lattice VL - 65 ER - TY - JOUR AB - We demonstrate the temporal Talbot effect for trapped matter waves using ultracold atoms in an optical lattice. We investigate the phase evolution of an array of essentially non-interacting matter waves and observe matter-wave collapse and revival in the form of a Talbot interference pattern. By using long expansion times, we image momentum space with sub-recoil resolution, allowing us to observe fractional Talbot fringes up to tenth order. AU - Mark, Manfred AU - Haller, Elmar AU - Danzl, Johann G AU - Lauber, Katharina AU - Gustavsson, Mattias AU - Nägerl, Hanns ID - 1051 JF - New Journal of Physics TI - Demonstration of the temporal matter-wave Talbot effect for trapped matter waves VL - 13 ER - TY - JOUR AB - We perform precision measurements on a Mott-insulator quantum state of ultracold atoms with tunable interactions. We probe the dependence of the superfluid-to-Mott-insulator transition on the interaction strength and explore the limits of the standard Bose-Hubbard model description. By tuning the on-site interaction energies to values comparable to the interband separation, we are able to quantitatively measure number-dependent shifts in the excitation spectrum caused by effective multibody interactions. AU - Mark, Manfred AU - Haller, Elmar AU - Lauber, Katharina AU - Danzl, Johann G AU - Daley, Andrew AU - Nägerl, Hanns ID - 1053 IS - 17 JF - Physical Review Letters TI - Precision measurements on a tunable Mott insulator of ultracold atoms VL - 107 ER - TY - JOUR AB - We investigate local three-body correlations for bosonic particles in three dimensions and one dimension as a function of the interaction strength. The three-body correlation function g(3) is determined by measuring the three-body recombination rate in an ultracold gas of Cs atoms. In three dimensions, we measure the dependence of g(3) on the gas parameter in a BEC, finding good agreement with the theoretical prediction accounting for beyond-mean-field effects. In one dimension, we observe a reduction of g( 3) by several orders of magnitude upon increasing interactions from the weakly interacting BEC to the strongly interacting Tonks-Girardeau regime, in good agreement with predictions from the Lieb-Liniger model for all strengths of interaction. AU - Haller, Elmar AU - Rabie, Mahmoud AU - Mark, Manfred AU - Danzl, Johann G AU - Hart, Russell AU - Lauber, Katharina AU - Pupillo, Guido AU - Nägerl, Hanns ID - 1054 IS - 23 JF - Physical Review Letters TI - Three-body correlation functions and recombination rates for bosons in three dimensions and one dimension VL - 107 ER - TY - JOUR AB - Nuclear pore complexes (NPCs) assemble at the end of mitosis during nuclear envelope (NE) reformation and into an intact NE as cells progress through interphase. Although recent studies have shown that NPC formation occurs by two different molecular mechanisms at two distinct cell cycle stages, little is known about the molecular players that mediate the fusion of the outer and inner nuclear membranes to form pores. In this paper, we provide evidence that the transmembrane nucleoporin (Nup), POM121, but not the Nup107–160 complex, is present at new pore assembly sites at a time that coincides with inner nuclear membrane (INM) and outer nuclear membrane (ONM) fusion. Overexpression of POM121 resulted in juxtaposition of the INM and ONM. Additionally, Sun1, an INM protein that is known to interact with the cytoskeleton, was specifically required for interphase assembly and localized with POM121 at forming pores. We propose a model in which POM121 and Sun1 interact transiently to promote early steps of interphase NPC assembly. AU - Talamas, Jessica A. AU - HETZER, Martin W ID - 11094 IS - 1 JF - Journal of Cell Biology KW - Cell Biology SN - 0021-9525 TI - POM121 and Sun1 play a role in early steps of interphase NPC assembly VL - 194 ER - TY - JOUR AB - As the gatekeepers of the eukaryotic cell nucleus, nuclear pore complexes (NPCs) mediate all molecular trafficking between the nucleoplasm and the cytoplasm. In recent years, transport-independent functions of NPC components, nucleoporins, have been identified including roles in chromatin organization and gene regulation. Here, we summarize our current view of the NPC as a dynamic hub for the integration of chromatin regulation and nuclear trafficking and discuss the functional interplay between nucleoporins and the nuclear genome. AU - Liang, Yun AU - HETZER, Martin W ID - 11096 IS - 1 JF - Current Opinion in Cell Biology KW - Cell Biology SN - 0955-0674 TI - Functional interactions between nucleoporins and chromatin VL - 23 ER - TY - JOUR AU - HETZER, Martin W AU - Cavalli, Giacomo ID - 11095 IS - 3 JF - Current Opinion in Cell Biology KW - Cell Biology SN - 0955-0674 TI - Editorial overview VL - 23 ER -