Dr. Roman Schnalle Universität Bielefeld Fakultät für Physik Universitätsstr. 25 D-33615 Bielefeld

University of Bielefeld Department of Physics Universitätsstr. 25 D-33615 Bielefeld

University of Bielefeld:

• Software/Application development in finance
  2010 - now

• Irreducible tensor operator techniques and point-group symmetries for molecular magnetism
  Project funded by the German Research Foundation (DFG), 2009 - 2010

• Symmetry assisted exact and approximate determination of the energy spectra of magnetic molecules using irreducible tensor operators
  PhD project funded by the federal state of Lower Saxony and the PhD program "Synthesis and Characterisation of Surfaces and Interfaces assembled from Clusters and Molecules", 2006 - 2009

• J. Schnack, R. Schnalle
  Evaluation of Magnetic Spectra Using the Irreducible Tensor Operator Approach
  in High Performance Computing in Science and Engeniering, Garching/Munich 2009,
  edited by S. Wagner, M. Steinmetz, A. Bode, and M. M. Müller (Springer, Heidelberg, 2010), pp. 575-588
  

• R. Steinigeweg, R. Schnalle
  Projection operator approach to spin diffusion in the anisotropic Heisenberg chain at high temperatures
  Phys. Rev. E 82, 040103(R) (2010)
  • online@AIP
  • .pdf Adobe Acrobat (0.2 MB)
  • arXiv:1006.4511

• N.B. Ivanov, J. Schnack, R. Schnalle, J. Richter, P. Koegerler, G.N. Newton, L. Cronin, Y. Oshima, H. Nojiri
  Heat capacity reveals the physics of a frustrated spin tube
  Phys. Rev. Lett. 105, 037206 (2010)
  • online@AIP
  • .pdf Adobe Acrobat (0.2 MB)
  • arXiv:1004.2373

• R. Schnalle, J. Schnack
  Calculating the energy spectra of magnetic molecules: application of real- and spin-space symmetries
  Int. Rev. Phys. Chem. 29, 3, 403 (2010)
  • online@informaworld
  • .pdf Adobe Acrobat (6.6 MB)
  • arXiv:1003.1909

• R. Schnalle
  Symmetry assisted exact and approximate determination of the energy spectra of magnetic molecules using irreducible tensor operators
  Dissertation, University of Osnabrück (2009)
  • online@repOSitorium

• R. Schnalle, A. Läuchli, J. Schnack
  Approximate eigenvalue determination of geometrically frustrated magnetic molecules
  Condensed Matter Physics 12, 3, p. 331 (2009)
  • online@CMP
  • .pdf Adobe Acrobat (0.6 MB)
  • arXiv:0906.0218

• J. Schnack, R. Schnalle
  Frustration effects in antiferromagnetic molecules: the cuboctahedron
  Polyhedron 28, 9-10, pp. 1620-1623 (2009)
  • online@Elsevier
  • .pdf Adobe Acrobat (0.3 MB)
  • arXiv:0810.2165

• R. Schnalle, J. Schnack
  Numerically exact and approximate determination of energy eigenvalues for antiferromagnetic molecules
  using irreducible tensor operators and general point-group symmetries
  Phys. Rev. B 79, 104419 (2009)
  • online@AIP
  • .pdf Adobe Acrobat (0.9 MB)
  • arXiv:0812.4126

• R. Schnalle, J. Schnack
  Optimized perturbation theory for molecular antiferromagnets
  
  • .pdf Adobe Acrobat (0.3 MB)
  • arXiv:0803.1046

• R. Schnalle
  Anwendung der Spinwellentheorie auf hochsymmetrische, magnetische Moleküle
  Diploma thesis, University of Osnabrueck (2006)
  • .pdf Adobe Acrobat (0.5 MB)

• R. Schnalle
  Thinking helps!
  Dedication of the Bielefeld HPC, Bielefeld, 17.06.2010
  

• R. Schnalle
  Approximate eigenvalue determination of geometrically frustrated magnetic molecules
  Spring Meeting of the German Physical Society (DPG), Regensburg, 22.03.2010
  

• R. Schnalle, J. Schnack
  Evaluation of magnetic spectra using the irreducible tensor operator approach
  HLRB, KONWIHR and Linux-Cluster Review and Results Workshop, Leibniz Computing Centre, Garching, 08.12.2009
  
• .pdf Adobe Acrobat (8.8 MB)

• R. Schnalle
  Symmetry assisted exact and approximate determination of the energy spectra of magnetic molecules using irreducible tensor operators
  PhD defense, University of Osnabrueck, 05.10.2009
• .pdf Adobe Acrobat (8.3 MB)

• R. Schnalle
  Irreducible tensor operators and point-group symmetries
  Leverhulme Meeting, The University of Manchester, Manchester (UK), 13. - 16.07.2009
  

• R. Schnalle, J. Schnack
  Irreducible tensor operators and point-group symmetries for spin systems
  "Linking Nuclei, Molecules, and Condensed Matter: Computational Quantum Many-Body Approaches", ECT*, Trento (Italy), 05. - 10.07.2009
  

• R. Schnalle
  Symmetry assisted exact and approximate diagonalization for antiferromagnetic molecules
  Expert's Seminar of the PhD program "Synthesis and Characterisation of Surfaces and Interfaces assembled from Clusters and Molecules", University of Osnabrueck, 22.06.2009
  

• R. Schnalle, J. Schnack
  Symmetry assisted approximate diagonalization for antiferromagnetic molecules
  Spring Meeting of the German Physical Society (DPG), Dresden, 22. - 27.03.2009
  

• R. Schnalle, J. Schnack
  Approximate diagonalization for molecular antiferromagnets
  2nd german-danish meeting on interface related phenomena, NanoSyd, Sonderborg (Denmark), 14. - 16.07.2008
  

• R. Schnalle, J. Schnack
  Approximate spectra for magnetic molecules based on rotational bands
  Group seminar of the Condensed Matter Theory Group, University of Bielefeld, 29.05.2008
  

• R. Schnalle, J. Schnack
  Approximate spectra for magnetic molecules with sublattice structure
  Spring meeting of the German Physical Society (DPG), Berlin, 25. - 29.02.2008
  

• R. Schnalle
  Approximate spectra for magnetic molecules with sublattice structure
  Workshop on "Magnetism in solids and molecules", University of Osnabrueck, 21.11.2007
  

• R. Schnalle
  Modifizierte Spinwellentheorie für Antiferromagneten - Anwendung auf hochsymmetrische magnetische Moleküle
  Group seminar of the Condensed Matter Theory Group, University of Bielefeld, 05.07.2007
  

• R. Schnalle
  From numerical exact diagonalization to spin-wave theory - tools to investigate magnetic molecules
  Seminar of the PhD program "Synthesis and Characterisation of Surfaces and Interfaces assembled from Clusters and Molecules", University of Osnabrueck, 25.06.2007
  

• R. Schnalle
  Frustrated systems in germanic history - a physical review
  Welcome seminar of the PhD program "Synthesis and Characterisation of Surfaces and Interfaces assembled from Clusters and Molecules", University of Osnabrueck, 12.01.2007
  

• R. Schnalle
  Spinwellentheorie für Antiferromagneten: Anwendung auf hochsymmetrische, magnetische Moleküle
  Seminar for theoretical Physics, University of Osnabrueck, 07.11.2006
  

• R. Schnalle
  Spinwellentheorie für Ferromagneten
  Seminar for theoretical Physics, University of Osnabrueck, 05.07.2005
  

• J. Schnack, R. Schnalle, H. Nojiri
  Specific heat of a Cu_3 spin tube
  Spring Meeting of the German Physical Society (DPG), Dresden, 22. - 27.03.2009
  

• R. Schnalle, J. Schnack
  Approximate optimized diagonalization for molecular antiferromagnets
  ICMM 2008, Florence (Italy), 21. - 24.09.2008

• R. Schnalle, J. Schnack
  Approximate diagonalization for molecular antiferromagnets
  Highly Frustrated Magnetism 2008 (HFM08), Braunschweig, 07. - 12.09.2008
• .pdf Adobe Acrobat (1.7 MB)

• R. Schnalle, J. Schnack
  Exact and approximate diagonalization using Irreducible Tensor Operators
  Internal presentation of recent research results, University of Bielefeld, 12. - 13.03.2008

• R. Schnalle, J. Schnack
  Spin-wave theory for magnetic molecules
  Spring meeting of the German Physical Society (DPG), Regensburg, 26. - 30.03.2007
• .pdf Adobe Acrobat (48 kB)

• Interests:
  
  
  • Modified spin-wave theory for molecular magnets
  
  
  • Group/Representation theory
  
  
  • Irreducible tensor operators
  
  
  • HPC (High Performance Computing) and Parallel Programming


• Former Group@UOS: Macroscopic systems and quantum theory


• Group@BI: Condensed Matter Theory

• Molecular magnetism
  
  
  • Molmag - a gate to molecular magnetism
  
  
  • Spinhenge@home - public resource computing devoted to molecular magnetism
  
  

• University of Osnabrueck
  
  
  • Physics department
  
  
  • Former Group@UOS: Macroscopic systems and quantum theory
  
  
  • PhD program: Synthesis and Characterisation of Surfaces and Interfaces assembled from Clusters and Molecules
  
  

• University of Bielefeld
  
  
  • Physics department
  
  
  • Condensed Matter Theory Group
  
  
  • Homepage of Jürgen Schnack