Silke BIERMANN

Head of the Department of Physics at Ecole Polytechnique

Professeur at Ecole Polytechnique

Research group : Condensed Matter 

Head of the team "Condensed matter" at CPHT

Silke Biermann receives the 2013 ERC Consolidator Grant

 

Address CPHT, Ecole Polytechnique, 91128 Palaiseau cedex, France
Phone number 01 69 33 42 77
Fax number 01 69 33 49 49
Contact firstname.lastname@polytechnique.edu
Office "Aile zéro", Office 1007

 

Research interest

My research is concerned with strong electronic Coulomb interactions in solid state systems. The 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 Recently, I found myself also doing quite a lot of work on iron-oxypnictides and related compounds, such as LaFeAsOFeSe, or BaFe2As2.

Recent Publications

Galler A, Ener S, Maccari F, Dirba, I, Skokov KP, Gutfleisch O, Biermann S, Pourovskii LV.
Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics.
npj Quantum Materials. 2021;6(1):2.
DOI: 10.1038/s41535-020-00301-6

Chattopadhyay S, Lenz B, Kanungo S, Sushila, Panda SK, Biermann S, Schnelle W, Manna K, Kataria R, Uhlarz M, Skourski Y, Zvyagin SA, Ponomaryov A, Herrmannsdorfer T, Patra R, Wosnitza J.
Pronounced 2/3 magnetization plateau in a frustrated S=1 isolated spin-triangle compound: Interplay between Heisenberg and biquadratic exchange interactions.
Physical Review B. 2019;100(9):094427.
DOI: 10.1103/PhysRevB.100.094427.

Jana S, Panda S K, Phuyal D, Pal B, Mukherjee S, Dutta A, Kumar P A, Hedlund D, Schott J, Thunstrom P, Kvashnin Y, Rensmo H, Kamalakar M V, Segre C U, Svedlindh P, Gunnarsson K, Biermann S, Eriksson O, Karis O, Sarma D D.
Charge disproportionate antiferromagnetism at the verge of the insulator-metal transition in doped LaFeO3.
Physical Review B. 2019;99(7):075106.
DOI: 10.1103/PhysRevB.99.075106.

Lenz B, Martins C, Biermann S.
Spectral functions of Sr2IrO4: theory versus experiment.
Journal of Physics-Condensed Matter. 2019;31(29):293001.
DOI: 10.1088/1361-648X/ab146a.

Louat A, Lenz B, Biermann S, Martins C, Bertran F, Le Fèvre P, Rault JE, Bert F, Brouet V.
ARPES study of orbital character, symmetry breaking, and pseudogaps in doped and pure Sr2IrO4.
Physical Review B. 2019;100(20):205135.
DOI: 10.1103/PhysRevB.100.205135.

Schmitz D, Schmitz-Antoniak C, Radu F, Ryll H, Luo C, Bhandary S, Biermann S, Siemensmeyer K, Wende H, Ivanov S, Eriksson O.
Soft X-Ray Magnetic Circular Dichroism of Vanadium in the Metal–Insulator Two-Phase Region of Paramagnetic V2O3 Doped with 1.1% Chromium.
Physica Status Solidi (B) Basic Research. 2019:1900456.
DOI: 10.1002/pssb.201900456.

Steinbauer J, De'Medici L, Biermann S.
Doping-driven metal-insulator transition in correlated electron systems with strong Hund's exchange coupling.
Physical Review B. 2019;100(8):085104.
DOI: 10.1103/PhysRevB.100.085104.

Steinbauer J, Biermann S, Bhandary S.
Role of charge transfer in hybridization-induced spin transition in metal-organic molecules.
Physical Review B. 2019;10(24):245418.
DOI: 10.1103/PhysRevB.100.245418.

Delange P, Backes S, van Roekeghem A, Pourovskii L, Jiang H, Biermann S.
Novel Approaches to Spectral Properties of Correlated Electron Materials: From Generalized Kohn-Sham Theory to Screened Exchange Dynamical Mean Field Theory.
Journal of the Physical Society of Japan. 2018;87(4):041003.
DOI: 10.7566/JPSJ.87.041003.

Jovic V, Koch RJ, Panda SK, Berger H, Bugnon P, Magrez A, Smith KE, Biermann S, Jozwiak C, Bostwick A, Rotenberg E, Moser S.
Dirac nodal lines and flat-band surface state in the functional oxide RuO2.
Physical Review B. 2018;98(24):241101.
DOI: 10.1103/PhysRevB.98.241101.

Martins C, Lenz B, Perfetti L, Brouet V, Bertran F, Biermann S.
Nonlocal Coulomb correlations in pure and electron-doped Sr2IrO4: Spectral functions, Fermi surface, and pseudo-gap-like spectral weight distributions from oriented cluster dynamical mean-field theory.
Physical Review Materials. 2018;2(3):032001.
DOI: 10.1103/PhysRevMaterials.2.032001

Mukherjee S, Pal B, Sarkar I, van Roekeghem A, Drube W, Takagi H, Matsuno J, Biermann S, Sarma DD.
Nature of the charge carriers in LaAlO3-SrTiO3 oxide heterostructures probed using hard X-ray photoelectron spectroscopy.
Epl. 2018;123(4):47003.
DOI: 10.1209/0295-5075/123/47003.

Ayral T, Biermann S, Werner P, Boehnke L.
Influence of Fock exchange in combined many-body perturbation and dynamical mean field theory.
Physical Review B 2017;95(24):245130.
DOI: 10.1103/PhysRevB.95.245130

Delange P, Biermann S, Miyake T, Pourovskii L.
Crystal-field splittings in rare-earth-based hard magnets: An ab initio approach.
Physical Review B 2017;96(15):155132.
DOI: 10.1103/PhysRevB.96.155132

Fink J, Rienks EDL, Thirupathaiah S, Nayak J, van Roekeghem A, Biermann S, et al.
Experimental evidence for importance of Hund's exchange interaction for incoherence of charge carriers in iron-based superconductors.
Physical Review B 2017;95(14):144513.
DOI: 10.1103/PhysRevB.95.144513

Hirayama M, Miyake T, Imada M, Biermann S.
Low-energy effective Hamiltonians for correlated electron systems beyond density functional theory.
Physical Review B 2017;96(7):075102.
DOI: 10.1103/PhysRevB.96.075102

Martins C, Aichhorn M, Biermann S.
Coulomb correlations in 4d and 5d oxides from first principles-or how spin-orbit materials choose their effective orbital degeneracies.
Journal of Physics-Condensed Matter 2017;29(26):263001.
DOI: 10.1088/1361-648X/aa648f

Panda SK, Jiang H, Biermann S.
Pressure dependence of dynamically screened Coulomb interactions in NiO: Effective Hubbard, Hund, intershell, and intersite components.
Physical Review B 2017;96(4):045137.
DOI: 10.1103/PhysRevB.96.045137

Seth P, Hansmann P, van Roekeghem A, Vaugier L, Biermann S.
Towards a First-Principles Determination of Effective Coulomb Interactions in Correlated Electron Materials: Role of Intershell Interactions.
Physical Review Letters 2017;119(5):056401.
DOI: 10.1103/PhysRevLett.119.056401

Curriculum Vitae

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’École Normale Supérieure Paris, France, 1994
Prediploma degrees, Physics and Mathematics, University of Cologne, Germany, 1993

Research

Since September 2003 Professeur Chargée de Cours ("Associate professor") at École 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 
PhotoWorkshop 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
Studienstiftung des deutschen Volkes
Condmat-ArXiv
PMC

 

 

English