Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Low-Dimensional Systems: Other Materials
TT 33.10: Vortrag
Dienstag, 17. März 2015, 12:00–12:15, H 3010
ARPES and NMTO Wannier Orbital Theory of Li0.9Mo6O17 — •L. Dudy1, J.W. Allen2, J.D. Denlinger3, J. He4, M. Greenblatt5, M.W. Haverkort6, O.K. Andersen7, and Y. Nohara7 — 1Physikalisches Institut, Universität Würzburg, D- 97074 Würzburg, Germany — 2University of Michigan, Ann Arbor, MI, USA — 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — 4Clemson University, Clemson, SC, USA — 5Rutgers University, Piscataway, NJ, USA — 6Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — 7Max-Planck-Institut für Festkörperphysik, Stuttgart, Germany
Li0.9Mo6O17 displays theoretically interesting [1] metallic quasi-one dimensional (1D) behavior that is unusually robust against 3D crossover with decreasing temperature, and is characterized by a large value of anomalous exponent α≈ 0.6 [2]. We present very high resolution, low temperature (T=6K-30K) angle resolved photoemission spectroscopy (ARPES) of its band structure and Fermi surface (FS), analyzed with N-th order muffin tin orbital (NMTO) Wannier function band theory. We confirm a previous conclusion [3] that LDA band theory is unusually successful, implying a small Hubbard U, and find in ARPES the dispersion and FS warping and splitting expected for predicted small and long range hoppings (t⊥≈ 10-15 meV) between chains.
[1] P. Chudzinski, T. Jarlborg and T. Giamarchi, Phys. Rev. B 86, 075147 (2013).
[2] L. Dudy et al., J. Phys. Cond. Matter 25, 014007 (2013).
[3] M. Nuss and M. Aichhorn, Phys. Rev. B 89, 045125 (2014).