Browsing by Subject "Quantum chemistry"

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  • AsS2Cl - An arsenic(V) compound? Formation, stability and structure of gaseous AsSCl and AsS2Cl - A combined experimental and theoretical study 
    Milke, E.; Köppe, R.; Binnewies, Michael (Cambridge : Royal Society of Chemistry, 2011)
    By reaction of solid As4S4 with gaseous Cl2 at a temperature of 410 K gaseous AsSCl and AsS2Cl are formed. Unexpectedly in AsS2Cl the arsenic is not of formal oxidation state +V but +III: the molecular structure of AsS2Cl ...
  • Dissipative preparation of antiferromagnetic order in the Fermi-Hubbard model 
    Kaczmarczyk, J.; Weimer, Hendrik; Lemeshko, Mikhail (Bristol : Institute of Physics Publishing, 2016)
    The Fermi-Hubbard model is one of the key models of condensed matter physics, which holds a potential for explaining the mystery of high-temperature superconductivity. Recent progress in ultracold atoms in optical lattices ...
  • Fabrication of quantum point contacts by engraving GaAs/AlGaAs heterostructures with a diamond tip 
    Regul, J.; Keyser, U.F.; Paesler, M.; Hohls, Frank; Zeitler, U.; Haug, Rolf J.; Malavé, A.; Oesterschulze, E.; Reuter, D.; Wieck, A.D. (College Park, MD : American Institute of Physics, 2002)
    We use the all-diamond tip of an atomic force microscope for the direct engraving of high-quality quantum point contacts in GaAs/AlGaAs heterostructures. The processing time is shortened by two orders of magnitude compared ...
  • Fast manipulation of Bose-Einstein condensates with an atom chip 
    Corgier, R.; Amri, S.; Herr, W.; Ahlers, H.; Rudolph, J.; Guéry-Odelin, D.; Rasel, Ernst Maria; Charron, E.; Gaaloul, Naceur (Bristol : Institute of Physics Publishing, 2018)
    We present a detailed theoretical analysis of the implementation of shortcut-to-adiabaticity protocols for the fast transport of neutral atoms with atom chips. The objective is to engineer transport ramps with durations ...
  • The formation and stability of molybdenum-antimony and tungsten-antimony ternary oxides Sb 2MO 6, Sb 2M 2O 9, Sb 2Mo 3O 12 and Sb 4MO 9 in the gas phase (M = Mo, W). Quantum chemical and mass spectrometric studies 
    Berezovskaya, E.; Milke, E.; Binnewies, Michael (Cambridge : Royal Society of Chemistry, 2012)
    The ternary oxides Sb 2MO 6, Sb 2M 2O 9, Sb 4MO 9 (M = Mo, W) and Sb 2Mo 3O 12 were detected in the gas phase by means of mass spectrometry (MS). These gaseous oxides are reported for the first time. Thermodynamic data was ...
  • High-order cumulants in the counting statistics of asymmetric quantum dots 
    Fricke, Christian; Hohls, Frank; Sethubalasubramanian, Nandhavel; Fricke, Lukas; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2010)
    Measurements of single electron tunneling through a quantum dot (QD) using a quantum point contact as charge detector have been performed for very long time traces with very large event counts. This large statistical basis ...
  • Interactions of Ions and Ultracold Neutral Atom Ensembles in Composite Optical Dipole Traps: Developments and Perspective 
    Karpa, Leon (Basel : MDPI, 2021)
    Ion–atom interactions are a comparatively recent field of research that has drawn considerable attention due to its applications in areas including quantum chemistry and quantum simulations. In first experiments, atomic ...
  • Multilayer ion trap technology for scalable quantum computing and quantum simulation 
    Bautista-Salvador, A.; Zarantonello, G.; Hahn, H.; Preciado-Grijalva, A.; Morgner, J.; Wahnschaffe, M.; Ospelkaus, C. (Bristol : Institute of Physics Publishing, 2019)
    We present a novel ion trap fabrication method enabling the realization of multilayer ion traps scalable to an in principle arbitrary number of metal-dielectric levels. We benchmark our method by fabricating a multilayer ...
  • Preparing attosecond coherences by strong-field ionization 
    Pabst, Stefan; Lein, Manfred; Wörner, Hans Jakob (College Park, MD : American Physical Society, 2016)
    Strong-field ionization (SFI) has been shown to prepare wave packets with few-femtosecond periods. Here, we explore whether this technique can be extended to the attosecond time scale. We introduce an intuitive model, which ...
  • Quantum Algorithmic Readout in Multi-Ion Clocks 
    Schulte, M.; Lörch, N.; Leroux, I.D.; Schmidt, Piet O.; Hammerer, K. (College Park, MD : American Physical Society, 2016)
    Optical clocks based on ensembles of trapped ions promise record frequency accuracy with good short-term stability. Most suitable ion species lack closed transitions, so the clock signal must be read out indirectly by ...
  • Quantum dots formed in a GaAsAlGaAs quantum ring 
    Mühle, A.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2008)
    We demonstrate the tunability of a GaAsAlGaAs quantum ring showing coherent Aharonov-Bohm oscillations up to a gate voltage regime where the ring splits into three quantum dots. This is explained based on the structure's ...
  • The quantum technologies roadmap: A European community view 
    Acín, Antonio; Bloch, Immanuel; Buhrman, Harry; Calarco, Tommaso; Eichler, Christopher; Eisert, Jens; Esteve, Daniel; Gisin, Nicolas; Glaser, Steffen J.; Jelezko, Fedor; Kuhr, Stefan; Lewenstein, Maciej; Riedel, Max F.; Schmidt, Piet O.; Thew, Rob; Wallraff, Andreas; Walmsley, Ian; Wilhelm, Frank K. (Bristol : Institute of Physics Publishing, 2018)
    Within the last two decades, quantum technologies (QT) have made tremendous progress, moving from Nobel Prize award-winning experiments on quantum physics (1997: Chu, Cohen-Tanoudji, Phillips; 2001: Cornell, Ketterle, ...
  • Quantum-Fluctuation-driven crossover from a dilute bose-einstein condensate to a macrodroplet in a dipolar quantum fluid 
    Chomaz, L.; Baier, S.; Petter, D.; Mark, M.J.; Wächtler, F.; Santos, Luis; Ferlaino, F. (College Park, MD : American Physical Society, 2016)
    In a joint experimental, theoretical effort, we report on the formation of a macrodroplet state in an ultracold bosonic gas of erbium atoms with strong dipolar interactions. By precise tuning of the s-wave scattering length ...
  • Semiclassical two-step model for strong-field ionization 
    Shvetsov-Shilovski, N.I.; Lein, Manfred; Madsen, L.B.; Räsänen, E.; Lemell, C.; Burgdörfer, J.; Arbó, D.G.; Tokési, K. (College Park, MD : American Physical Society, 2016)
    We present a semiclassical two-step model for strong-field ionization that accounts for path interferences of tunnel-ionized electrons in the ionic potential beyond perturbation theory. Within the framework of a classical ...
  • Sideband Thermometry of Ion Crystals 
    Vybornyi, Ivan; Dreissen, Laura S.; Kiesenhofer, Dominik; Hainzer, Helene; Bock, Matthias; Ollikainen, Tuomas; Vadlejch, Daniel; Roos, Christian F.; Mehlstäubler, Tanja E.; Hammerer, Klemens (College Park, MD : American Physical Society, 2023)
    Coulomb crystals of cold trapped ions are a leading platform for the realization of quantum processors and quantum simulations and, in quantum metrology, for the construction of optical atomic clocks and for fundamental ...
  • Synthesis of ternary transition metal fluorides Li 3MF 6via a sol-gel route as candidates for cathode materials in lithium-ion batteries 
    Kohl, Julia; Wiedemann, Dennis; Nakhal, Suliman; Bottke, Patrick; Ferro, Noel; Bredow, Thomas; Kemnitz, Erhard; Wilkening, Martin; Heitjans, Paul; Lerch, Martin (Cambridge : Royal Society of Chemistry, 2012)
    A sol-gel route for ternary lithium fluorides of transition metals (M) is presented allowing the synthesis of Li 3MF 6-type and Li 2MF 5-type compounds. It is based on a fluorolytic process using transition metal ...
  • Temperature-dependent broadening of coherent current peaks in InAs double quantum dots 
    Dani, Olfa; Hussein, Robert; Bayer, Johannes C.; Kohler, Sigmund; Haug, Rolf J. (London : Springer Nature, 2022)
    Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment ...
  • The coupled system (2)2Σ+ and (1)2Π of 7Li88Sr 
    Schwanke, Erik; Gerschmann, Julia; Knöckel, Horst; Ospelkaus, Silke; Tiemann, Eberhard (Bristol : IOP Publishing Ltd., 2020)
    We analyse rovibrational transitions of the (2)2Σ+-X(1)2Σ+ system of LiSr and find the energy levels of the (2)2Σ+ state to be perturbed by coupling between the (2)2Σ+ and (1)2Π states. We present an analysis of the coupled ...
  • Thorium nanochemistry: The solution structure of the Th(iv)-hydroxo pentamer 
    Walther, C.; Rothe, J.; Schimmelpfennig, B.; Fuss, M. (Cambridge : Royal Society of Chemistry, 2012)
    Tetravalent thorium exhibits a strong tendency towards hydrolysis and subsequent polymerization. Polymeric species play a crucial role in understanding thorium solution chemistry, since their presence causes apparent ...