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Ast, Christian, Dr.

Ast-Christian.jpg
 Office: 6C26
Phone: 1653

Lab: 5C11/6C11/7B15
Phone: 1561/1643/1750

Email: c.ast

Research Interests

Low-Dimensional Structures
 thin films, surface alloys, noble metal surfaces, low-dimensional crystals, semimetals, graphene
Electronic Structure

spin-orbit coupling, symmetry-broken environments, electron-phonon interaction, electron-electron interaction, many-particle effects
Experimental Methods

 angle-resolved photoemission spectroscopy (also using synchrotron radiation), x-ray photoemission spectroscopy, scanning tunneling microscopy/spectroscopy at low temperatures

Professional Experience

01/2008 - present

 Emmy-Noether Research Group Leader at the MPI for
Solid State Reasearch in Stuttgart, Germany
01/2007 - 12/2007

 PostDoc at the Max-Planck-Institute for Solid State
Research in Stuttgart, Germany
01/2005 - 12/2006



Emmy-Noether-Scholarship (Phase I) at the Ecole
Polytechnique Fédérale de Lausanne, Switzerland
and at the Max-Planck-Institute for Solid State
Research in Stuttgart, Germany
01/2004 - 12/2004

 Collaborateur Scientifique at the Ecole Polytechnique
Fédérale de Lausanne, Switzerland
09/2003 - 12/2003

 Visiting Scientist at the Max-Planck-Institute for Solid
State Research in Stuttgart, Germany

Education

08/2003 

Ph.D. in Experimental Condensed Matter Physics at the University of Wisconsin-Madison, Wisconsin, USA
07/1998 Vordiplom in Physics at the Universität Hamburg, Germany

 

Publications

39.


 I. Gierz, M. Lindroos, H. Höchst, C. R. Ast and K. Kern, Graphene sublattice symmetry and isospin determined by circular dichroism in angle-resolved photoemission spectroscopy, (submitted) (2012)
38.


 C. R. Ast and I. Gierz, An sp-band tight-binding model for the Rashba-Bychkov effect in a two-dimensional electron gas including nearest neighbor contributions from an electric field, (submitted) (2012)
37.


 M. Assig, A. Koch, W. Stiepany, C. Straßer, A. Ast, K. Kern, and C. R. Ast, Miniature Active Damping Stage for Scanning Probe Applications in Ultra High Vacuum, Rev. Sci. Instr. (to be published) (2012)
36.

 H. M. Benia, C. T. Lin, K. Kern, and C. R. Ast, Reactive chemical doping of the Bi2Se3 topological insulator, Phys. Rev. Lett. 107, 177602 (also: arXiv:1105.2664) (2011)
35.

 I. Gierz, F. Meier, J. H. Dil, K. Kern, C. R. Ast, Tuning the spin texture in binary and ternary surface alloys on Ag(111), Phys. Rev. B 83, 195122 (also: arXiv:1011.1829) (2011)
34.


 I. Gierz, J. Henk, H. Höchst, C. R. Ast, and K. Kern, Illuminating the dark corridor in graphene: polarization dependence of angle-resolved photoemission spectroscopy on graphene, Phys. Rev. B 83, 121408(R) (also: arXiv:1010.1618) (2011) (Editor's Suggestion)
33.

 I. Gierz, J. H. Dil, F. Meier, B. Slomski, J. Osterwalder, J. Henk, R. Winkler, C. R. Ast, and K. Kern, Giant spin splitting in epitaxial graphene, arXiv:1004.1573v1/v2 (2010)
32.


 I. Gierz, B. Stadtmüller, J. Vuorinen, M. Lindroos, F. Meier, J. H. Dil, K. Kern, and C. R. Ast, The Structural Influence on the Rashba-type Spin-Splitting in Surface Alloys, Phys. Rev. B 81, 245430 (also: arXiv:1003.2351) (2010)
31.


 I. Gierz, T. Suzuki, D. S. Lee, B. Krauss, C. Riedl, U. Starke, H. Höchst, J. H. Smet, C. R. Ast, and K. Kern, Electronic decoupling of an epitaxial graphene monolayer by gold intercalation, Phys. Rev. B 81, 235408 (also: arXiv:1003.2355) (2010) (Editor's Suggestion)
30.


 L. Moreschini, A. Bendounan, H. Bentmann, M. Assig, K. Kern, F. Reinert, J. Henk, C. R. Ast, and M. Grioni, The influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces, Phys. Rev. B 80, 035438 (2009)
29.


 I. Gierz, T. Suzuki, E. Frantzeskakis, S. Pons, S. Ostanin, A. Ernst, J. Henk, M. Grioni, K. Kern, and C. R. Ast, Silicon surface with giant spin-splitting, Phys. Rev. Lett. 103, 046803 (also: arXiv:0905.0790) (2009)
28.


 E. Frantzeskakis, L. Moreschini, S. Pons, C. R. Ast, D. Pacilé, M. Papagno, M. C. Falub, M. Grioni, New Mechanism for Spin-Orbit Splitting of Conduction States in Surface Alloys, e-J. Surf. Sci. Nanotech. 7, 264 (2009)
27.



 L. Moreschini, A. Bendounan, I. Gierz, C.R. Ast, H. Mirhosseini, H. Höchst, K. Kern, J. Henk, K. Kern, J. Henk, A. Ernst, S. Ostanin, F. Reinert, and M. Grioni, Assessing the atomic contribution to the Rashba spin-orbit splitting in surface alloys: Sb/Ag(111), Phys. Rev. B 79, 075424 (2009)
26.

 I. Gierz, C. Riedl, U. Starke, C. R. Ast, and K. Kern, Atomic Hole Doping of Graphene, Nano Lett. 8, 4603 (also: arXiv:0808.0621) (2008)
25.


 E. Frantzeskakis, S. Pons, H. Mirhosseini, J. Henk, C. R. Ast, and M. Grioni, Tuning of spin-gaps at silicon interfaces, Phys. Rev. Lett. 101, 196805 (2008) (also: arXiv:0805.3959) (2008)
24.


 C.R. Ast, M. Assig, A. Ast, K. Kern, Design criteria for scanning tunneling microscopes to reduce the response to external mechnanical disturbances, Rev. Sci. Instr. 79, 093704 (2008)
23.


 L. Moreschini, A. Bendounan, C.R. Ast, F. Reinert, and M. Grioni, The effect of rare gas adsorption on the spin-orbit split bands of a surface alloy: Xe on Bi/Ag(111), Phys. Rev. B 77, 115407 (2008)
22.


 C.R. Ast, D. Pacilé, L. Moreschini, M.C. Falub, M. Papagno, K. Kern, M. Grioni, J. Henk, A. Ernst, S. Ostanin, and P. Bruno, Spin-orbit split two-dimensional electron gas with tunable Rashba and Fermi energy, Phys. Rev. B 77, 081407(R) (2008)
21.

 C. R. Ast, J. Henk, A. Ernst, L. Moreschini, M. Falub, D. Pacilé, P. Bruno, K. Kern , M. Grioni, Giant spin-splitting through surface alloying, Phys. Rev. Lett. 98, 186807 (2007)
20.


 C. R. Ast, G. Wittich, P. Wahl, R. Vogelgesang, D. Pacilé, M. Falub, L. Moreschini, M. Papagno, M. Grioni, K. Kern, Local detection of spin-orbit splitting by scanning tunneling spectroscopy, Phys. Rev. B 75, 201401(R) (2007) (also cond-mat/0509509)
19.

 D. Pacilé, C. R. Ast, M. Papagno, C. DaSilva, M. Grioni, A. P. Seitsonen, The electronic structure of the Pb/Ag(111) surface alloy, Phys. Rev. B 73, 245429 (2006)
18.


 C. R. Ast, D. Pacilé, M. Papagno, T. Gloor, F. Mila, S. Fedrigo, H. Brune, G. Wittich, K. Kern, M. Grioni, Orbital selective overlayer-substrate hybridization in a Pb monolayer on Ag(111), Phys. Rev. B 73, 245428 (2006)
17.


 M. Grioni, C. R. Ast, D. Pacilé, M. Papagno, H. Berger, and L. Perfetti, Photoemission as a probe of coexisting and conflicting periodicities in low-dimensional solids, New J. Phys. 7, 106 (2005)
16.


 G.-H. Gweon, S.-K. Mo, J. W. Allen, C. R. Ast, H. Höchst, J. L. Sarrao, and Z. Fisk, Hidden one-dimensional electronic structure and non-Fermi liquid angle resolved photoemission line shapes of \eta-Mo4O11, Phys. Rev. B 72, 035126 (2005)
15.


 C. R. Ast, H. Höchst, Final state band structure induced modulations of the photoemission line width in angle resolved valence band spectra: a case study on Bi(111), J. Elec. Spec. Rel. Phen. 144, 679 (2005)
14.


 C. R. Ast and H. Höchst, Reply to Comment: Momentum Dependent Energy Losses in Core Level Photoemission Spectra of Poorly Conducting Metals?, Phys. Rev. Lett. 94, 209704 (2005)
13.

 C. R. Ast and H. Höchst, High-resolution photoemission mapping of the threedimensional band structure of Bi(111), Phys. Rev. B 70, 245122 (2004)
12.

 H. Höchst and C. R. Ast, Momentum dependent Low Energy Losses in Angle Resolved Core Level Photoemission Spectra, J. Elec. Spec. Rel. Phen. 137-140, 407 (2004)
11.

 H. Höchst and C. R. Ast, The Fermi Surfaces of Thin Sb(111) Films, J. Elec. Spec. Rel. Phen. 137-140, 441 (2004)
10.

 C. R. Ast and H. Höchst, Momentum Dependent Energy Losses in Core Level Photoemission Spectra of Poorly Conducting Metals?, Phys. Rev. Lett. 91, 197602 (2003)
9.

 C. R. Ast and H. Höchst, The Electronic Structure of a Bismuth Bilayer, Phys. Rev. B 67, 113102 (2003)
8.

 C. R. Ast and H. Höchst, Indication of Charge Density Wave Formation in Bi(111), Phys. Rev. Lett. 90, 016403 (2003)
7.


 C. Janowitz, R. Müller, L. Dudy, R.-St. Unger, A. Krapf, R. Manzke, C. R. Ast, H. Höchst, Progress in the understanding of the normal state of the cuprates, Appl. Phys. A 76, 673 (2003)
6.

 C. R. Ast and H. Höchst, Two-dimensional band structure and self-energy of Bi(111) near the Γ point, Phys. Rev. B 66, 125103 (2002)
5.


 C. Janowitz, R. Müller, M. Schneider, A. Krapf, H. Höchst, C. R. Ast, R. Manzke, Unusual electronic ground state of a prototype cuprate: Band splitting of single CuO2-plane Bi2Sr2−xLaxCuO6+\delta, Europhys. Lett. 60, 615 (2002)
4.


 R. Müller, C. Janowitz, M. Schneider, R.-St. Unger, A. Krapf, H. Dwelk, A. Müller, L. Dudy, R. Manzke, C. R. Ast, and H. Höchst, Fermi surface and superconducting gap of triple-layered Bi2Sr2Ca2Cu3O10+\delta, J. Supercond. 15, 147 (2002)
3.


 R. Müller, C. Janowitz, A. Krapf, M. Schneider, R.-St. Unger, L. Dudy, H. Dwelk, R. Manzke, H. Höchst, and C. R. Ast, Photon energy dependence of ARPES-spectra of single layer Bi2Sr2−xLaxCuO6+\delta, Physica B 312, 91 (2002)
2.

 C. Janowitz, R.Müller, M. Schneider, A. Krapf, H. Höchst, C. Ast, and R. Manzke, Fermi surface of Bi-cuprates with variable number of CuO2 planes, Physica C 364-365, 600 (2001)
1.

 C. R. Ast and H. Höchst, Fermi Surface of Bi(111) Measured by Photoemission Spectroscopy, Phys. Rev. Lett. 87, 177602 (2001)