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570 results on '"Palm, F."'

1. Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons

Author

Wilke, R. H., Köhler, T., Palm, F. A., and Paeckel, S.

Subjects
Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons, Quantum Physics
Abstract

We introduce a mechanism stabilizing a one-dimensional quantum many-body phase, characterized by a certain wave vector $k_0$, from a $k_0$-modulated coupling to a center site, via the protection of an emergent $\mathbb Z_2$ symmetry. We illustrate this mechanism by constructing the solution of the full quantum many-body problem of hardcore bosons on a wheel geometry, which are known to form a Bose-Einstein condensate. The robustness of the condensate is shown numerically by adding nearest-neighbor interactions to the wheel Hamiltonian. We identify the energy scale that controls the protection of the emergent $\mathbb Z_2$ symmetry. We discuss further applications such as geometrically inducing finite-momentum condensates. Since our solution strategy is based on a generic mapping from a wheel geometry to a projected ladder, our analysis can be applied to various related problems with extensively scaling coordination numbers.

Published
2021
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8. Telemedizin in der Schlaganfallversorgung – versorgungsrelevant für Deutschland

Author

Barlinn, J., Winzer, S., Worthmann, H., Urbanek, C., Häusler, K. G., Günther, A., Erdur, H., Görtler, M., Busetto, L., Wojciechowski, C., Schmitt, J., Shah, Y., Büchele, B., Sokolowski, P., Kraya, T., Merkelbach, S., Rosengarten, B., Stangenberg-Gliss, K., Weber, J., Schlachetzki, F., Abu-Mugheisib, M., Petersen, M., Schwartz, A., Palm, F., Jowaed, A., Volbers, B., Zickler, P., Remi, J., Bardutzky, J., Bösel, J., Audebert, H. J., Hubert, G. J., and Gumbinger, C.

Published
2021
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16. Coagulation Testing in Intracerebral Hemorrhage Related to Non-vitamin K Antagonist Oral Anticoagulants

Author

Purrucker, Jan C., Rizos, Timolaos, Haas, Kirsten, Wolf, Marcel, Khan, Shujah, Heuschmann, Peter U., Veltkamp, Roland, Buchner, H., Ertl, M., Haarmeier, T., Hobohm, C., Jüttler, E., Neumann-Haefelin, T., Hennerici, M. G., Kleinschnitz, C., Köhrmann, M., Palm, F., Reinhard, M., Röther, J., Schellinger, P., Schmid, E., Seidel, G., Poli, S., Steiner, T., Tanislav, C., Thomalla, G., Veltkamp, R., Wartenberg, K., and on behalf of the RASUNOA investigators

Published
2017
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17. Microplasticity and macroplasticity behavior of additively manufactured Al-Mg-Sc-Zr alloys: in-situ experiment and modeling

Author

Zhang, Xingxing, Bauer, P.-P., Lutz, A., Wielenberg, C., Palm, F., Gan, W. M, and Maawad, E.

Subjects
ddc:530
Abstract

International journal of plasticity 166, 103659 (2023). doi:10.1016/j.ijplas.2023.103659, Understanding and controlling the performance of additively manufactured aluminum alloys containing scandium (Sc) and zirconium (Zr) elements heavily relies on knowledge of their microplasticity and macroplasticity behavior. However, this aspect has received very little attention. In this investigation, we examined the microplasticity and macroplasticity behavior of additively manufactured Al-Mg-Sc-Zr alloys before and after aging, using in-situ synchrotron X-ray diffraction and full-field crystal plasticity modeling. Our study provides a quantitative assessment of the transitions from elasticity to microplasticity and then to macroplasticity and analyzes the development of the initial microstructure, particularly the dislocations. We constructed crystal plasticity fast-Fourier-transform models based on dislocation densities. The predicted evolutions of macroscopic stress-strain curves, lattice strains, and dislocation densities agree with in-situ measurements. The present findings provide deep insights into controlling the performance of AM Al-Mg-Sc-Zr alloys. Besides, the micromechanical model developed in this investigation paves the way for predicting the microplasticity and macroplasticity behavior of various metallic materials., Published by Pergamon Press, Frankfurt, M. [u.a.]

Published
2023
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31. Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons

Author

Wilke, R. H., Köhler, T., Palm, F. A., and Paeckel, S.

Subjects
Condensed Matter::Quantum Gases, Condensed Matter - Strongly Correlated Electrons, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), Quantum Gases (cond-mat.quant-gas), FOS: Physical sciences, Quantum Physics (quant-ph), Condensed Matter - Quantum Gases
Abstract

We introduce a mechanism stabilizing a one-dimensional quantum many-body phase, characterized by a certain wave vector $k_0$, from a $k_0$-modulated coupling to a center site, via the protection of an emergent $\mathbb Z_2$ symmetry. We illustrate this mechanism by constructing the solution of the full quantum many-body problem of hardcore bosons on a wheel geometry, which are known to form a Bose-Einstein condensate. The robustness of the condensate is shown numerically by adding nearest-neighbor interactions to the wheel Hamiltonian. We identify the energy scale that controls the protection of the emergent $\mathbb Z_2$ symmetry. We discuss further applications such as geometrically inducing finite-momentum condensates. Since our solution strategy is based on a generic mapping from a wheel geometry to a projected ladder, our analysis can be applied to various related problems with extensively scaling coordination numbers.

Published
2022
Full Text
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