Denis Golež

Review on Photo-induced nonequilibrium states in Mott insulators

Nonlinear response in symmetry-broken systems (excitonic, eta-pairing, superconducting)

Review on Photo-induced nonequilibrium states in Mott insulators

Finally, our review on driven Mott insulators is published in Review of Modern Physics. (https://journals.aps.org/rmp/abstract/10.1103/tkjh-lr83 ). Thanks to Yuta, Martin and Philipp for this long, but insighful journey. Thanks to Lenka Trdina for the nice cover.

Recent highlights

Alexander just published Optical signatures of dynamical excitonic condensates in Physical Review Letters. Congrats !!!

Popular summary: Recent advances in nanotechnology allow the fabrication of atomically thin bilayers in which interlayer excitons—electron–hole pairs bound across two layers can form a Bose–Einstein condensate under applied voltage. Open questions are what dynamical phases such condensates can host and how they can be experimentally observed? Our theoretical study predicts two distinct voltage-tunable dynamical phases. In the first phase, the excitonic order parameter remains confined within a finite range of angles, while in the second, it winds continuously through all angles. This winding phase is accompanied by a pronounced tendency toward stimulated emission, and we predict it could be detected through the optical response. These results provide a concrete experimental signature for identifying dynamical phases in excitonic condensates and point to the possibility of engineered condensates that radiate light. The work opens new directions for experiments probing the interplay between coherence, dynamics, and light–matter coupling in quantum materials.

With Zhiyuan Sun we published Dynamical exciton condensates in biased electron-hole bilayers in Physical Review Letters. Congrats !!!

Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.217002

With Jason Kaye, Zhen Huang and Hugo Strand we published Decomposing imaginary-time Feynman diagrams using separable basis functions: Anderson impurity model strong-coupling expansionin Physical Review X. Congrats !!!

Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.217002

Popular summary: Interactions in quantum many-body systems can be described using a mathematical tool called the Feynman diagram expansion technique. The diagrams represent multidimensional integrals, whose dimension grows with the expansion order. To evaluate diagrammatic expansions of all but the lowest orders, researchers typically use stochastic Monte Carlo integration methods. However, these have several limitations, including slow convergence and the sign problem. In this work, we point out a “nearly convolutional” structure of bold diagrammatic expansions in imaginary time and show how it can be used to obtain an efficient deterministic method for diagram evaluation.

Our algorithm substantially reduces the rate of exponential scaling of the computational cost of direct diagram evaluation with the order. It is robust, efficient at low temperatures, and avoids the sign problem. We apply the method to the bold hybridization expansion of low-symmetry quantum impurity models, for which continuous-time quantum Monte Carlo methods suffer from a severe sign problem. We show that our solver exhibits rapid convergence with increasing diagram order.

Our approach provides a promising new type of solver for quantum impurity models. We anticipate immediate application areas, such as the study of relativistic Mott insulators, and expect the underlying technique to be broadly applicable and compatible with other diagrammatic methods.

Large collaboration, primarily with Anita, Andrej and Andy, led to the publication Picosecond volume expansion drives a later-time insulator–metal transition in a nano-textured Mott insulator in Nature Physics. Congrats to all !!!

Link: https://www.nature.com/articles/s41567-024-02396-1

Very nice popular summary was provided by Denitsa R. Baykusheva: Through the slopes of a light-induced phase transition (https://www.nature.com/articles/s41567-024-02401-7).

Together with Klemen and Janez we showed that proper optical pulse can induce pairing of bipolarons with nonlinear coupling which was publised in PRL. Congrats to all !!!

Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.106001

Popular summary: The authors study how short light pulses can create and control bipolarons — pairs of electrons that bind together because they deform the lattice — in a material where the electrons couple to vibrations (phonons) nonlinearly (the coupling depends on the square of the vibration amplitude). They show that by tuning the frequency of the light pulse, you can turn the effective interaction between the electrons from repulsive to attractive (or back), create long-lived bound electron pairs that survive after the pulse ends, and even switch the sign of the interaction using two pulses of different frequencies. This mechanism is robust across dimensions and survives realistic complications such as phonon dispersion and anharmonicity.

Correlated system in and out of equilibrium

Denis Golež, Eva Paprotzki, Philipp Werner, and Martin Eckstein. Theory of ultrafast screening of u in driven charge-transfer insulators: A time-resolved x-ray absorption study. Physical Review B, 111(4):045147, 2025.
Madhumita Sarkar, Zala Lenarčič, and Denis Golež. Floquet engineering of binding in doped and photo-doped mott insulators. Physical Review Research, 6(3):033331, 2024.
Yuta Murakami, Denis Golež, Martin Eckstein, and Philipp Werner. Photoinduced nonequilibrium states in mott insulators. Reviews of Modern Physics, 97(3):035001, 2025.
Tatsuya Kaneko, Yuta Murakami, Denis Golež, Zhiyuan Sun, and Andrew J Millis. Exciton-spin interactions in antiferromagnetic charge-transfer insulators. Physical Review B, 108(20):205121, 2023.
Tobias Lojewski, Denis Golež, Katharina Ollefs, Loïc Le Guyader, Lea Kämmerer, Nico Rothen- bach, Robin Y Engel, Piter S Miedema, Martin Beye, Gheorghe S Chiuzbăian, et al. Photoinduced charge transfer renormalization in nio. Physical Review B, 110(24):245120, 2024.
Anita Verma, Denis Golež, Oleg Yu Gorobtsov, Kelson Kaj, Ryan Russell, Jeffrey Z Kaaret, Erik Lamb, Guru Khalsa, Hari P Nair, Yifei Sun, et al. Picosecond volume expansion drives a later-time insulator–metal transition in a nano-textured mott insulator. Nature Physics, 20(5):807–814, 2024.
Philipp Werner, Denis Golez, and Martin Eckstein. Local interpretation of time-resolved x-ray absorption in mott insulators: Insights from nonequilibrium dynamical mean-field theory. Physical Review B, 106(16):165106, 2022.
Yuta Murakami, Shintaro Takayoshi, Tatsuya Kaneko, Zhiyuan Sun, Denis Golež, Andrew J Millis, and Philipp Werner. Exploring nonequilibrium phases of photo-doped mott insulators with generalized gibbs ensembles. Communications Physics, 5(1):23, 2022.
Nikolaj Bittner, Denis Golež, Michele Casula, and Philipp Werner. Photoinduced dirac-cone flattening in ba ni s 2. Physical Review B, 104(11):115138, 2021.
Jan Ravnik, Yevhenii Vaskivskyi, Jaka Vodeb, Polona Aupič, Igor Vaskivskyi, Denis Golež, YaroslavGerasimenko, ViktorKabanov, andDraganMihailovic. Quantum billiards with correlated electrons confined in triangular transition metal dichalcogenide monolayer nanostructures. Nature Communications, 12(1):3793, 2021.
Jiajun Li, Denis Golež, et.al, Superconducting optical response of photodoped Mott insulators, Modern Physics Letters B, 2040054 (2020).
Yuta Murakami, Denis Golež, Tatsuya Kaneko, et.al., Collective modes in excitonic insulators: Effects of electron-phonon coupling and signatures in the optical response, Physical Review B 101 (19), 195118 (2020).
Nikolaj Bittner, Denis Golež, Martin Eckstein, and Philipp Werner. Photo-enhanced excitonic correlations in a Mott insulator with nonlocal interactions. Phys. Rev. B 101, 085127 (2020).
Konrad Gillmeister, Denis Golež, Cheng-Tien Chiang, Nikolaj Bittner, Yaroslav Pavlyukh, Jamal Berakdar, Philipp Werner, and Wolf Widdra. Ultrafast coupled charge and spin dynamics in strongly correlated NiO. Nature Communications volume 11, 4095 (2020).
Philipp Werner, Jianju Li, Denis Golež, and Martin Eckstein. Entropy-cooled nonequilibrium states of the hubbard model. Phys. Rev. B, 100:155130 (2019).
Denis Golež, Martin Eckstein, and Philipp Werner. Multiband nonequilibrium GW + EDMFT formalism for correlated insulators. Phys. Rev. B, 100:235117 (2019).
Denis Golež, Lewin Boehnke, Martin Eckstein, and Philipp Werner. Dynamics of photodoped charge transfer insulators. Phys. Rev. B, 100:041111 (2019).
Sharareh Sayyad, Rok Žitko, Hugo U. R. Strand, Philipp Werner, and Denis Golež. Comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems. Phys. Rev. B, 99:045118, Jan (2019)
Riku Tuovinen, Denis Golež, Michael Schüler, Philipp Werner, Martin Eckstein, and Michael A. Sentef. Adiabatic preparation of a correlated symmetry-broken initial state with the generalized kadanoff–baym ansatz. physica status solidi (b), 256(7):1800469 (2019).
Nikolaj Bittner, Denis Golež, Hugo U. R. Strand, Martin Eckstein, and Philipp Werner. Coupled charge and spin dynamics in a photoexcited doped mott insulator. Phys. Rev. B, 97:235125 (2018).
Yuta Murakami, Denis Golež, Martin Eckstein, and Philipp Werner. Photoinduced enhancement of excitonic order. Phys. Rev. Lett., 119:247601 (2017).
Manuel Ligges, Isabella Avigo, Denis Golež, Hugo Strand, Ljupka Stojchevska, Matthias Kalläne, Kai Rossnagel, Martin Eckstein, Philipp Werner, Uwe Bovensiepen. Ultrafast doublon dynamics in photo-excited 1T-TaS2. Phys. Rev. Lett., 120:166401 (2018).
Denis Golež, Lewin Boehnke, Hugo U. R. Strand, Martin Eckstein, and Philipp Werner. Nonequilibrium GW+EDMFT: Antiscreening and Inverted Populations from Nonlocal Correlations. Phys. Rev. Lett. 118, 246402 (2017).
Selene Mor, Marc Herzog, Denis Golež, Philipp Werner, Martin Eckstein, Naoyuki Katayama, Minoru Nohara, Hide Takagi, Takashi Mizokawa, Claude Monney, Julia Staehler. Ultrafast electronic band gap control in an excitonic insulator. Phys. Rev. Lett. 119, 086401 (2017).
Denis Golež, Philipp Werner, and Martin Eckstein. Photoinduced gap closure in an excitonic insulator. Phys. Rev.B, 94:035121 (2016).
Denis Golež, Martin Eckstein, and Philipp Werner. Dynamics of screening in photodoped Mott insulators. Phys. Rev. B, 92:195123 (2015).
Stefano Dal Conte, Lev Vidmar, Denis Golež, Marcin Mierzejewski, Giancarlo Soavi, Simone Peli, Francesco Banfi, Gabriele Ferrini, Riccardo Comin, Bart M Ludbrook, Laetitia Chauviere, N. D. Zhigadlo, H. Eisaki, M. Greven, S. Lupi, Andreas Damascelli, D. Brida, Masimo Capone, Janez Bonča, G. Cerullo and Claudio Giannetti. Snapshots of the retarded interaction of charge carriers with ultrafast fluctuations in cuprates. Nature Physics, 11(5):421-426 (2015)
Denis Golež, Janez Bonča, Marcin Mierzejewski, and Lev Vidmar. Mechanism of ultrafast relaxation of a photo-carrier in antiferromagnetic spin background. Phys. Rev. B, 89:165118 (2014).
Denis Golež and Rok Žitko. Lifshitz phase transitions in the ferromagnetic regime of the Kondo lattice model. Phys. Rev. B, 88:054431 (2013).
Denis Golež, Janez Bonča, and Rok Žitko. Vibrational Andreev bound states in magnetic molecules. Phys. Rev. B, 86:085142 (2012).

Polaronic systems

Klemen Kovač, Denis Golež, Marcin Mierzejewski, and Janez Bonča. Optical manipulation of bipolarons in a system with nonlinear electron-phonon coupling. Physical review letters, 132(10):106001, 2024.
Jonathan H Fetherolf, Denis Golež, and Timothy C Berkelbach. A unification of the holstein polaron and dynamic disorder pictures of charge transport in organic semiconductors, Phys. Rev. X 10, 021062 (2020).
Stefano Dal Conte, Lev Vidmar, Denis Golež, Marcin Mierzejewski, Giancarlo Soavi, Simone Peli, Francesco Banfi, Gabriele Ferrini, Riccardo Comin, Bart M Ludbrook, Laetitia Chauviere, N. D. Zhigadlo, H. Eisaki, M. Greven, S. Lupi, Andreas Damascelli, D. Brida, Masimo Capone, Janez Bonča, G. Cerullo and Claudio Giannetti. Snapshots of the retarded interaction of charge carriers with ultrafast fluctuations in cuprates. Nature Physics, 11(5):421-426 (2015)
Jan Kogoj, Zala Lenarčič, Denis Golež, Marcin Mierzejewski, Peter Prelovšek, and Janez Bonča. Multistage dynamics of the spin-lattice polaron formation. Phys. Rev. B, 90:125104 (2014).
Zala Lenarčič, Denis Golež, Janez Bonča, and Peter Prelovšek. Optical response of highly excited particles in a strongly correlated system. Phys. Rev. B, 89:125123 (2014).
Denis Golež, Janez Bonča, Marcin Mierzejewski, and Lev Vidmar. Mechanism of ultrafast relaxation of a photo-carrier in antiferromagnetic spin background. Phys. Rev. B, 89:165118 (2014).
Denis Golež, Janez Bonča, Lev Vidmar, and Stuart A. Trugman. Relaxation Dynamics of the Holstein Polaron. Phys. Rev. Lett., 109:236402 (2012).
Denis Golež, Janez Bonča, and Lev Vidmar. Dissociation of a Hubbard-Holstein bipolaron driven away from equilibrium by a constant electric field. Phys. Rev. B, 85:144304 (2012).

Strong-light matter coupling

Jiajun Li, Denis Golež, Giacomo Mazza, et.al. Electromagnetic coupling in tight-binding models for strongly correlated light and matter, Physical Review B 101 (20), 205140 (2020).
Zhiyuan Sun, Yuta Murakami, Fengyuan Xuan, Tatsuya Kaneko, Denis Golež, and A. J. Millis. Dynamical exciton condensates in biased electron-hole bilayers. Physical review letters, 133(21):217002 (2024).

Numerical methods

Jason Kaye, Zhen Huang, Hugo UR Strand, and Denis Golež. Decomposing imaginary-time feynman diagrams using separable basis functions: Anderson impurity model strong-coupling expansion. Physical Review X, 14(3):031034, 2024.
JasonKaye and DenisGolez. Low rank compression in the numerical solution of the nonequilibrium Dyson equation. SciPost Physics, 10(4):091, 2021.
Michael Schüler, Denis Golež, Yuta Murakami, Nikolaj Bittner, Andreas Hermann, Hugo UR Strand, Philipp Werner, and Martin Eckstein. Nessi: The non-equilibrium systems simulation package. Computer Physics Communications 257, 107484 (2020).
Riku Tuovinen, Denis Golež, et.al, Comparing the generalized Kadanoff-Baym ansatz with the full Kadanoff-Baym equations for an excitonic insulator out of equilibrium, Phys. Rev. B 102, 115157 (2020).

Nonlinear response in symmetry-broken systems (excitonic, eta-pairing, superconducting)

Banhi Chatterjee, Denis Golež, and Jernej Mravlje. Delicate competition between different excitonic orderings in ta2nise5. Crystals, 15(5):414, 2025.
Alexander Osterkorn, Yuta Murakami, Tatsuya Kaneko, Zhiyuan Sun, Andrew J Millis, and Denis Golež. Optical signatures of dynamical excitonic condensates. Physical Review Letters, 135(10):106902, 2025.
Lei Geng, Xiulan Liu, Jianing Zhang, Denis Golež, and Liang-You Peng. Anomalous photoinduced band renormalization in correlated materials: The case of ta 2 nise 5. Physical Review B, 110(11):115104, 2024.
Banhi Chatterjee, Jernej Mravlje, and Denis Golež. Collective modes and raman response in ta2nise 5. Physical Review B, 111(12):L121106, 2025.
Thomas Blommel, Jason Kaye, Yuta Murakami, Emanuel Gull, and Denis Golež. Chirped amplitude mode in photoexcited superconductors. Physical Review B, 111(9):094502, 2025.
Denis Golež, Sydney KY Dufresne, Min-Jae Kim, Fabio Boschini, Hao Chu, Yuta Murakami,Giorgio Levy, Arthur K Mills, Sergey Zhdanovich, Masahiko Isobe, et al. Unveiling the underlying interactions in ta 2 nise 5 from photoinduced lifetime change. Physical Review B, 106(12):L121106, 2022.
Zhiyuan Sun, Tatsuya Kaneko, Denis Golež, and Andrew J Millis. Second-order josephson effect in excitonic insulators. Physical Review Letters, 127(12):127702, 2021.
Tanusree Saha, Denis Golež, Giovanni De Ninno, Jernej Mravlje, Yuta Murakami, Barbara Ressel, Matija Stupar, and Primož Rebernik Ribič. Photoinduced phase transition and associated timescales in the excitonic insulator ta 2 ni se 5. Physical Review B, 103(14):144304, 2021.
Tatsuya Kaneko, Zhiyuan Sun, Yuta Murakami, Denis Golež, and Andrew J Millis. Bulk, Photovoltaic effect driven by collective excitations in a correlated insulator. Physical Review Letters, 127(12):127402, 2021.
Jiajun Li, Denis Golež, et.al, Superconducting optical response of photodoped Mott insulators, Modern Physics Letters B, 2040054 (2020)
Yuta Murakami, Denis Golež, Tatsuya Kaneko, et.al., Collective modes in excitonic insulators: Effects of electron-phonon coupling and signatures in the optical response, Physical Review B 101 (19), 195118 (2020).
Denis Golež, Janez Bonča, Marcin Mierzejewski, and Lev Vidmar. Mechanism of ultrafast relaxation of a photo-carrier in antiferromagnetic spin background. Phys. Rev. B, 89:1651182014.

Page updated

Google Sites

Report abuse