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Silke Biermann
Centre de Physique Théorique (CPHT)
École Polytechnique
91128 Palaiseau Cedex
France
Tel.: +33-1-6933-4277
Fax.: +33-1-6933-4949
firstname.lastname@cpht.polytechnique.fr |
Professeur
chargée de cours
à l'Ecole Polytechnique
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Research Interests
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My research is concerned with strong electronic Coulomb
interactions in solid state systems. The two key questions are: What's
the role of strong Coulomb interactions, and what consequences can they
have? How to handle them within solid state theory?
The first question cannot be discussed without
mentioning the following points:
- Metal-insulator transitions
- Spectral weight transfer from quasi-particle
excitations to incoherent contributions
- Interplay of structural, orbital and spin degrees
of freedom in correlated materials
- Non-local effects of Coulomb correlations
During the last 40 years Density Functional
Theory (DFT) within the local density approximation (LDA) has
revolutionized the field of electronic structure calculations. Still,
the materials I am particularly interested in are precisely those for
which this theory is not sufficient. In strongly correlated systems
Coulomb many-body effects cannot be expressed within an effective
single-particle theory; to calculate dynamical correlations Dynamical Mean Field
Theory (DMFT) is a useful tool. Combining DFT and DMFT (which leads
to the so-called "LDA+DMFT" method) nowadays allows to calculate the
electronic structure of strongly correlated materials (nearly) from
first principles (i.e. without adjustable parameters).
Relevant methodological questions include:
Developments within LDA+DMFT, e.g. concerning
impurity model solvers, basis sets
Cluster extensions of DMFT
Some fundamental questions (e.g.: What's U in
a solid? )
Developments of alternative (first principles)
approaches (the word "nearly" is missing now!), such as GW+DMFT
Materials that are good test cases are e.g. the
following:
transition metals
their oxides (e.g. VO2, vanadates, titanates)
and sulfides
lanthanides and actinides
quasi-1d systems
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Some Recent Publications
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Breakup
of the Fermi Surface Near the Mott Transition in Low-Dimensional Systems
C. Berthod, T. Giamarchi, S. Biermann, A. Georges,
Phys. Rev. Lett. 97, 136401 (2006)
Time
Evolution of the Electronic Structure of 1T-TaS2
through the Insulator-Metal Transition
L. Perfetti, A. Loukakos, M. Lisowski, U. Bovensiepen, H. Berger,
S. Biermann, P.S. Cornaglia, A. Georges, M. Wolf
Phys. Rev. Lett. 97, 067402 (2006)
The alpha-gamma transition of
Cerium is entropy-driven
B. Amadon, S. Biermann, A. Georges, F. Aryasetiawan
Phys. Rev. Lett.
96, 066402 (2006)
Non-Fermi-Liquid Behavior and
Double-Exchange Physics in Orbital-Selective Mott Systems
S. Biermann, L. de' Medici, A. Georges
Phys. Rev. Lett.
95, 206401 (2005)
Orbital-selective Mott transition
in multiband systems: Slave-spin representation and dynamical
mean-field theory
L. de' Medici, S. Biermann, A. Georges
Phys. Rev. B 72,
205124 (2005)
Mott Transition and Kondo Screening
in f-Electron Metals
L. de' Medici, A. Georges, G. Kotliar, S. Biermann
Phys. Rev. Lett.
95, 066402 (2005)
Importance of Interorbital Charge
Transfers for the Metal-to-Insulator Transition of BaVS3
F. Lechermann, S. Biermann, A. Georges
Phys. Rev. Lett.
94, 166402 (2005)
Dynamical Singlets and
Correlation-assisted Peierls Transition in VO2
S. Biermann, A. Poteryaev, A. I. Lichtenstein, A. Georges
Phys. Rev. Lett.
94, 026404 (2005)
Frequency-dependent local
interactions and low-energy effective models from electronic structure
calculations
F. Aryasetiawan, M. Imada, A. Georges, G. Kotliar, S. Biermann, and A.
I. Lichtenstein
Phys. Rev. B 70,
195104 (2004)
Mott Transition and Suppression of
Orbital Fluctuations in Orthorhombic 3d1 Perovskites
E. Pavarini, S. Biermann, A. Poteryaev, A. I. Lichtenstein, A. Georges,
and O. K. Andersen
Phys.
Rev. Lett. 92, 176403 (2004)
Observation of Hubbard Bands in
gamma-Manganese
S. Biermann, A. Dallmeyer, C. Carbone, W. Eberhardt, C. Pampuch, O.
Rader, M. I. Katsnelson, and A. I. Lichtenstein
JETP Letters 80, Issue 9, 612 (2004)
First-Principles Approach to the
Electronic Structure of Strongly Correlated Systems: Combining the GW
Approximation and Dynamical Mean-Field Theory
S. Biermann, F. Aryasetiawan, and A. Georges
Phys.
Rev. Lett. 90, 086402 (2003)
Spectroscopic Signatures of a
Bandwidth-Controlled Mott Transition at the Surface of 1T-TaSe2
L. Perfetti, A. Georges, S. Florens, S. Biermann, S. Mitrovic, H.
Berger, Y. Tomm, H. Höchst, and M. Grioni
Phys. Rev. Lett. 90, 166401 (2003)
Deconfinement Transition and
Luttinger to Fermi Liquid Crossover in Quasi-One-Dimensional Systems
S. Biermann, A. Georges, A. Lichtenstein, and T. Giamarchi
Phys.
Rev. Lett. 87, 276405 (2001)
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Curriculum Vitae
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Degrees
Ph.D., Physics, University of Cologne, Germany, 2000
Diploma degree, Physics, University of Cologne, Germany, 1996
Maîtrise, Physics, Magistère Interuniversitaire de
Physique des Universités Paris VI, VII, XI, XIII et
de l'Ecole Normale Supérieure Paris, France, 1994
Prediploma degrees, Physics and Mathematics, University of Cologne,
Germany, 1993
Research
- Since September 2003
- Professeur Chargée de Cours at Ecole
Polytechnique, France
- Affiliation: Centre de Physique
Théorique, École Polytechnique, Palaiseau, France.
- September 2000 - August 2003
- Postdoctoral fellow/CNRS associate
researcher at Laboratoire de Physique des Solides Université
Paris Sud and
Laboratoire de Physique Théorique de l'Ecole Normale
Supérieure Paris, France
- April 1997 - August 2000
- Ph.D. student at Juelich Research Centre,
Germany
- July 1996 - March 1997
- Visiting scholar at Texas A&M
University, Texas, USA
Organisation of conferences and schools
Workshop
"Electronic Structure of Correlated Materials" and Mid-Term Review of
the RTN "f-Electron Materials", Paris, 2004 -- Photo
Workshop on Ab Initio
Methods for Correlated Spintronics Materials, Mont Saint Odile, 2004
School on
"Electronic Structure Calculations and Correlated Materials", Les
Houches, 2006
Links
LPS Orsay
LPT ENS
RTN network on
f-electron physics
Studienstiftung
des deutschen Volkes
Condmat-ArXiv
Google
PMC
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