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Excitonic Magnetism in Strongly Correlated Materials

Total Cost €


EC-Contrib. €






Project "EXMAG" data sheet

The following table provides information about the project.


Organization address
address: KARLSPLATZ 13
city: WIEN
postcode: 1040

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Austria [AT]
 Project website
 Total cost 1˙382˙500 €
 EC max contribution 1˙382˙500 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2014-CoG
 Funding Scheme ERC-COG
 Starting year 2015
 Duration (year-month-day) from 2015-06-01   to  2020-05-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    TECHNISCHE UNIVERSITAET WIEN AT (WIEN) coordinator 1˙204˙750.00
2    FYZIKALNI USTAV AV CR V.V.I CZ (PRAHA 8) participant 177˙750.00


 Project objective

Spontaneous symmetry breaking leading to states of matter with long-range order is one of the central topics in condensed matter physics. Common types of order, such as ferro- and anti-ferromagnetic, are characterized by spin or charge densities modulated on inter-atomic scale, therefore well studied thanks to various scattering experiments. Order parameters that are not of this type are much more difficult to detect, giving rise to names such as hidden order or electronic nematicity. Their impact on transport or thermodynamic properties may, nevertheless, be substantial. In the EXMAG project we will investigate excitonic condensation in systems with strongly correlated electrons as a new mechanism leading to unconventional ordered states. The objective of the project is to characterize the physical properties of various excitonic phases and to find their realization in real materials. We will focus on intermediate coupling strength and doped systems where the interaction between the excitonic order and the charge carriers is expected to lead to new physics. In particular, we want to explore the potential of the excitonic order to induce instabilities, e.g. magnetic or superconducting, that are not present in the normal phase. We will also address the possibility of topologically non-trivial quasi-particle band-structures in the excitonic phase. Our main tool will be numerical simulations based on the dynamical mean-field theory and ab initio band-structure methods. We will pursue two main lines of research: investigation of simple models allowing access to many physical observables and studies of real materials capturing the chemical complexities at the cost of more severe approximations. Ultimately, we want to understand in detail the properties of the excitonic magnets and their potential functionalities,and to identify the main control parameters and promising materials.


year authors and title journal last update
List of publications.
2019 D. Geffroy, J. Kaufmann, A. Hariki, P. Gunacker, A. Hausoel, J. Kuneš
Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study
published pages: , ISSN: 0031-9007, DOI: 10.1103/physrevlett.122.127601
Physical Review Letters 122/12 2020-01-24
2019 J. Ebad-Allah, J. Fernández Afonso, M. Krottenmüller, J. Hu, Y. L. Zhu, Z. Q. Mao, J. Kuneš, C. A. Kuntscher
Chemical pressure effect on the optical conductivity of the nodal-line semimetals ZrSi Y ( Y = S , Se , Te
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.99.125154
Physical Review B 99/12 2020-01-24
2019 Juan Fernández Afonso, Andrii Sotnikov, Atsushi Hariki, Jan Kuneš
Pressure-induced spin-state ordering in Sr 2 CoO 3 F
published pages: , ISSN: 2469-9950, DOI: 10.1103/physrevb.99.205118
Physical Review B 99/20 2020-01-24
2019 Kyo-Hoon Ahn, Atsushi Hariki, Kwan-Woo Lee, Jan Kuneš
Antiferromagnetism in RuO 2 as d -wave Pomeranchuk instability
published pages: 184432, ISSN: 2469-9950, DOI: 10.1103/physrevb.99.184432
Physical Review B 99/18 2020-01-24
2017 A. Sotnikov, J. Kuneš
Competing phases in a model of Pr-based cobaltites
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.96.245102
Physical Review B 96/24 2020-01-24
2017 Atsushi Hariki, Andreas Hausoel, Giorgio Sangiovanni, Jan Kuneš
DFT+DMFT study on soft moment magnetism and covalent bonding in SrRu 2 O 6
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.96.155135
Physical Review B 96/15 2020-01-24
2018 Juan Fernandez Afonso, Andrii Sotnikov, J Kunes
Theoretical investigation of excitonic magnetism in LaSrCoO4
published pages: , ISSN: 0953-8984, DOI: 10.1088/1361-648X/aab0bb
Journal of Physics: Condensed Matter 2020-01-24
2018 D. Geffroy, A. Hariki, J. Kuneš
Excitonic magnet in external field: Complex order parameter and spin currents
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.97.155114
Physical Review B 97/15 2020-01-24
2018 M S Bulakhov, A S Peletminskii, S V Peletminskii, Yu V Slyusarenko, A G Sotnikov
Re-examining the quadratic approximation in theory of a weakly interacting Bose gas with condensate: the role of nonlocal interaction potentials
published pages: 205302, ISSN: 0953-4075, DOI: 10.1088/1361-6455/aae061
Journal of Physics B: Atomic, Molecular and Optical Physics 51/20 2020-01-24
2018 Andrii Sotnikov, Agnieszka Cichy, Jan Kuneš
Suppression and revival of long-range ferromagnetic order in the multiorbital Fermi-Hubbard model
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.97.235157
Physical Review B 97/23 2020-01-24
2018 Ru-Pan Wang, Atsushi Hariki, Andrii Sotnikov, Federica Frati, Jun Okamoto, Hsiao-Yu Huang, Amol Singh, Di-Jing Huang, Keisuke Tomiyasu, Chao-Hung Du, Jan Kuneš, Frank M. F. de Groot
Excitonic dispersion of the intermediate spin state in LaCoO 3 revealed by resonant inelastic x-ray scattering
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.98.035149
Physical Review B 98/3 2020-01-24
2018 Atsushi Hariki, Mathias Winder, Jan Kuneš
Continuum Charge Excitations in High-Valence Transition-Metal Oxides Revealed by Resonant Inelastic X-Ray Scattering
published pages: , ISSN: 0031-9007, DOI: 10.1103/PhysRevLett.121.126403
Physical Review Letters 121/12 2020-01-24
2017 A. Golubeva, A. Sotnikov, A. Cichy, J. Kuneš, W. Hofstetter
Breaking of SU(4) symmetry and interplay between strongly correlated phases in the Hubbard model
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.95.125108
Physical Review B 95/12 2020-01-24
2017 Atsushi Hariki, Takayuki Uozumi, Jan Kuneš
LDA+DMFT approach to core-level spectroscopy: Application to 3 d transition metal compounds
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.96.045111
Physical Review B 96/4 2020-01-24
2017 J. Fernández Afonso, J. Kuneš
Excitonic magnetism in d 6 perovskites
published pages: , ISSN: 2469-9950, DOI: 10.1103/PhysRevB.95.115131
Physical Review B 95/11 2020-01-24
2016 Andrii Sotnikov, Jan Kunes
Field-induced exciton condensation in LaCoO3
published pages: 30510, ISSN: 2045-2322, DOI: 10.1038/srep30510
Scientific Reports 6 2020-01-24
2016 Agnieszka Cichy, Andrii Sotnikov
Orbital magnetism of ultracold fermionic gases in a lattice: Dynamical mean-field approach
published pages: 53624, ISSN: 2469-9926, DOI: 10.1103/PhysRevA.93.053624
Physical Review A 93/5 2020-01-24
2016 J. Kuneš, D. Geffroy
Spontaneous Spin Textures in Multiorbital Mott Systems
published pages: 256403, ISSN: 0031-9007, DOI: 10.1103/PhysRevLett.116.256403
Physical Review Letters 116/25 2020-01-24

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