Publications

Review articles

• L. Janssen and M. Vojta, Heisenberg-Kitaev physics in magnetic fields, Topical Review in J. Phys.: Condens. Matter 31, 423002 (2019)

Preprints

• N. Francini, L. Schmidt, L. Janssen, and D. Lozano-Gómez, Exact nematic and mixed magnetic phases driven by competing orders on the pyrochlore lattice, arXiv:2510.23704

• K. K. Bestha, M. Sahoo, N. Francini, R. Kluge, R. Morrow, A. Maljuk, S. Wurmehl, S. Luther, Y. Skourski, H. Kühne, S. Mishra, J. Geck, M. Brando, B. Büchner, L. T. Corredor, L. Janssen, A. U. B. Wolter, Field-induced magnetic phases in the Kitaev candidate Na₃Co₂SbO₆, arXiv:2510.09282

• J. Biedermann and L. Janssen, Dirac quantum criticality in twisted double bilayer transition metal dichalcogenides, arXiv:2509.04561

• Z. H. Liu, H. Lu, Z. Y. Meng, and L. Janssen, Interaction-induced nematic Dirac semimetal from quadratic band touching: A constrained-path quantum Monte Carlo study, arXiv:2507.15668

Research articles

• N. Francini, P. M. Cônsoli, L. Janssen, Ferrimagnetism from quantum fluctuations in Kitaev materials, Phys. Rev. B 112, 155103 (2025)

• M. Fornoville and L. Janssen, Fractionalized fermionic multicriticality in anisotropic Kitaev spin-orbital liquids, Phys. Rev. B 112, 125142 (2025) (Editors' Suggestion)

• D. J. Moser and L. Janssen, Continuous order-to-order quantum phase transitions from fixed-point annihilation, Rep. Prog. Phys. 88, 098001 (2025)

• X. Hong, M. Schiffer, B. V. Schwarze, M. Uhlarz, X. Jin, W. Yao, L. Janssen, S. Zherlitsyn, B. Büchner, Y. Li, Y. Sun, and C. Hess, Direct probe of magnetic field effects on phonons by ultrasound propagation in a quasi-two-dimensional honeycomb magnet Na₂Co₂TeO₆, Phys. Rev. B 112, 094403 (2025)

• J. Biedermann and L. Janssen, Twist-tuned quantum criticality in moiré bilayer graphene, Phys. Rev. B 112, L041109 (2025)

• B. Hawashin, M. M. Scherer, and L. Janssen, Gross-Neveu-XY quantum criticality in moiré Dirac materials, Phys. Rev. B 111, 205129 (2025)

• N. Francini, L. Janssen, and D. Lozano-Gómez, Higher-rank spin liquids and spin nematics from competing orders in pyrochlore magnets, Phys. Rev. B 111, 085140 (2025) (Editors' Suggestion)

• M. Song, J. Zhao, M. Cheng, C. Xu, M. M. Scherer, L. Janssen, and Z. Y. Meng, Evolution of entanglement entropy at SU(N) deconfined quantum critical points, Sci. Adv. 11, eadr0634 (2025)

• B. Hawashin, A. Eichhorn, L. Janssen, M. M. Scherer, and S. Ray, The Nordic-walking mechanism and its explanation of deconfined pseudocriticality from Wess-Zumino-Witten theory, Nat. Commun. 16, 20 (2025)

• Niccolò Francini and Lukas Janssen, Ferrimagnetism from triple-q order in Na₂Co₂TeO₆, Phys. Rev. B 110, 235118 (2024)

• Z. H. Liu, M. Vojta, F. F. Assaad, and L. Janssen, Critical properties of metallic and deconfined quantum phase transitions in Dirac systems, Phys. Rev. B 110, 125123 (2024)

• D. J. Moser and L. Janssen, Quasiuniversality from all-in-all-out Weyl quantum criticality in pyrochlore iridates, Phys. Rev. B 109, L081111 (2024)

• X. Hong, M. Gillig, W. Yao, L. Janssen, V. Kocsis, S. Gass, Y. Li, A. U. B. Wolter, B. Büchner, and C. Hess, Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material Na₂Co₂TeO₆, npj Quantum Mater. 9, 18 (2024)

• N. Francini and L. Janssen, Spin vestigial orders in extended Heisenberg-Kitaev models near hidden SU(2) points: Application to Na₂Co₂TeO₆, Phys. Rev. B 109, 075104 (2024)

• W. G. F. Krüger, W. Chen, X. Jin, Y. Li, and L. Janssen, Triple-q Order in Na₂Co₂TeO₆ from Proximity to Hidden-SU(2)-Symmetric Point, Phys. Rev. Lett. 131, 146702 (2023)

• B. Frank, Z. H. Liu, F. F. Assaad, M. Vojta, and L. Janssen, Marginal Fermi liquid at magnetic quantum criticality from dimensional confinement, Phys. Rev. B 108, L100405 (2023)

• Z. H. Liu, B. Frank, L. Janssen, M. Vojta, and F. F. Assaad, Magnetic quantum phase transition in a metallic Kondo heterostructure, Phys. Rev. B 107, 165104 (2023)

• K. Ladovrechis, S. Ray, T. Meng, and L. Janssen, Gross-Neveu-Heisenberg criticality from 2 + ε expansion, Phys. Rev. B 107, 035151 (2023)

• J. Schwab, L. Janssen, K. Sun, Z. Y. Meng, I. F. Herbut, M. Vojta, and F. F. Assaad, Nematic Quantum Criticality in Dirac Systems, Phys. Rev. Lett. 128, 157203 (2022)

• Z. H. Liu, M. Vojta, F. F. Assaad, and L. Janssen, Metallic and Deconfined Quantum Criticality in Dirac Systems, Phys. Rev. Lett. 128, 087201 (2022) (Editors' Suggestion)

• L. Janssen and U. F. P. Seifert, Phase diagrams of SO(N) Majorana-Hubbard models: Dimerization, internal symmetry breaking, and fluctuation-induced first-order transitions, Phys. Rev. B 105, 045120 (2022)

• W. G. F. Krüger and L. Janssen, Nesting instability of gapless U(1) spin liquids with spinon Fermi pockets in two dimensions, Phys. Rev. B 104, 165133 (2021)

• A. Eichhorn, M. Pauly, and S. Ray, Towards a Higgs mass determination in asymptotically safe gravity with a dark portal, J. High Energy Phys. 10 (2021) 100

• S. Ray and L. Janssen, Gross-Neveu-Heisenberg criticality from competing nematic and antiferromagnetic orders in bilayer graphene, Phys. Rev. B 104, 045101 (2021)

• C. Balz, L. Janssen, P. Lampen-Kelley, A. Banerjee, Y. H. Liu, J.-Q. Yan, D. G. Mandrus, M. Vojta, and S. E. Nagler, Field-induced intermediate ordered phase and anisotropic interlayer interactions in α-RuCl₃, Phys. Rev. B 103, 174417 (2021) (Editors' Suggestion)

• S. Ray, B. Ihrig, D. Kruti, J. A. Gracey, M. M. Scherer, and L. Janssen, Fractionalized quantum criticality in spin-orbital liquids from field theory beyond the leading order, Phys. Rev. B 103, 155160 (2021)

• S. Chulliparambil, L. Janssen, M. Vojta, H.-H. Tu, and U. F. P. Seifert, Flux crystals, Majorana metals, and flat bands in exactly solvable spin-orbital liquids, Phys. Rev. B 103, 075144 (2021)

• R. Hentrich, X. Hong, M. Gillig, F. Caglieris, M. Culo, M. Shahrokhvand, U. Zeitler, M. Roslova, A. Isaeva, T. Doert, L. Janssen, M. Vojta, B. Büchner, and C. Hess, High-field thermal transport properties of the Kitaev quantum magnet α-RuCl₃: Evidence for low-energy excitations beyond the critical field, Phys. Rev. B 102, 235155 (2020)

• U. F. P. Seifert, X.-Y. Dong, S. Chulliparambil, M. Vojta, H.-H. Tu, and L. Janssen, Fractionalized Fermionic Quantum Criticality in Spin-Orbital Mott Insulators, Phys. Rev. Lett. 125, 257202 (2020)

• S. Chulliparambil, U. F. P. Seifert, M. Vojta, L. Janssen, and H.-H. Tu, Microscopic models for Kitaev's sixteenfold way of anyon theories, Phys. Rev. B 102, 201111(R) (2020)

• P. M. Cônsoli, L. Janssen, M. Vojta, and E. C. Andrade, Heisenberg-Kitaev model in a magnetic field: 1/S expansion, Phys. Rev. B 102, 155134 (2020)

• E. C. Andrade, L. Janssen, and M. Vojta, Susceptibility anisotropy and its disorder evolution in models for Kitaev materials, Phys. Rev. B 102, 115160 (2020)

• S.-H. Baek, H. W. Yeo, S.-H. Do, K.-Y. Choi, L. Janssen, M. Vojta, and B. Büchner, Observation of a random singlet state in a diluted Kitaev honeycomb material,  Phys. Rev. B 102, 094407 (2020)

• S. Ray, M. Vojta, and L. Janssen, Soluble fermionic quantum critical point in two dimensions, Phys. Rev. B 102, 081112(R) (2020)

• S. Gass, P. M. Cônsoli, V. Kocsis, L. T. Corredor, P. Lampen-Kelley, D. G. Mandrus, S. E. Nagler, L. Janssen, M. Vojta, B. Büchner, and A. U. B. Wolter, Field-induced phase transitions of the Kitaev material α-RuCl₃ probed by thermal expansion and magnetostriction, Phys. Rev. B 101, 245158 (2020)

• L. Janssen, W. Wang, M. M. Scherer, Z. Y. Meng, and X. Y. Xu, Confinement transition in the QED₃-Gross-Neveu-XY universality class, Phys. Rev. B 101, 235118 (2020)

• L. Janssen, S. Koch, and M. Vojta, Magnon dispersion and dynamic spin response in three-dimensional spin models for α-RuCl₃, Phys. Rev. B 101, 174444 (2020)

• E. Torres, L. Weber, L. Janssen, S. Wessel, and M. M. Scherer, Emergent symmetries and coexisting orders in Dirac fermion systems, Phys. Rev. Research 2, 022005(R) (2020)

• W. G. F. Krüger, M. Vojta, and L. Janssen, Heisenberg-Kitaev models on hyperhoneycomb and stripy-honeycomb lattices: 3D-2D equivalence of ordered states and phase diagrams, Phys. Rev. Research 2, 012021(R) (2020)

• S. Ray, M. Vojta, and L. Janssen, Quantum critical behavior of two-dimensional Fermi systems with quadratic band touching, Phys. Rev. B 98, 245128 (2018) (Editors' Suggestion)

• B. Ihrig, L. Janssen, L. N. Mihaila, and M. M. Scherer, Deconfined criticality from the QED₃-Gross-Neveu model at three loops, Phys. Rev. B 98, 115163 (2018)

• P. Lampen-Kelley, L. Janssen, E. C. Andrade, S. Rachel, J.-Q. Yan, C. Balz, D. G. Mandrus, S. E. Nagler, and M. Vojta, Field-induced intermediate phase in α-RuCl₃: Non-coplanar order, phase diagram, and proximate spin liquid, arXiv:1807.06192

• L. Janssen, I. F. Herbut, and M. M. Scherer, Compatible orders and fermion-induced emergent symmetry in Dirac systems, Phys. Rev. B 97, 041117(R) (2018)

• L. Janssen and Y.-C. He, Critical behavior of the QED₃-Gross-Neveu model: Duality and deconfined criticality, Phys. Rev. B 96, 205113 (2017)

• L. Janssen, E. C. Andrade, and M. Vojta, Magnetization processes of zigzag states on the honeycomb lattice: Identifying spin models for α-RuCl₃ and Na₂IrO₃, Phys. Rev. B 96, 064430 (2017)

• A. U. B. Wolter, L. T. Corredor, L. Janssen, K. Nenkov, S. Schönecker, S.-H. Do, K.-Y. Choi, R. Albrecht, J. Hunger, T. Doert, M. Vojta, and B. Büchner, Field-induced quantum criticality in the Kitaev system α-RuCl₃, Phys. Rev. B 96, 041405(R) (2017)

• L. Janssen and I. F. Herbut, Phase diagram of electronic systems with quadratic Fermi nodes in 2 < d < 4: 2 + ε expansion, 4 − ε expansion, and functional renormalization group, Phys. Rev. B 95, 075101 (2017)

• L. Janssen, E. C. Andrade, and M. Vojta, Honeycomb-Lattice Heisenberg-Kitaev Model in a Magnetic Field: Spin Canting, Metamagnetism, and Vortex Crystals, Phys. Rev. Lett. 117, 277202 (2016)

• L. Janssen, Spontaneous breaking of Lorentz symmetry in (2 + ε)-dimensional QED, Phys. Rev. D 94, 094013 (2016)

• A. Eichhorn, L. Janssen, and M. M. Scherer, Critical O(N) models above four dimensions: Small-N solutions and stability, Phys. Rev. D 93, 125021 (2016)

• L. Janssen and I. F. Herbut, Excitonic instability of three-dimensional gapless semiconductors: Large-N theory, Phys. Rev. B 93, 165109 (2016)

• I. F. Herbut and L. Janssen, Critical O(2) and O(3) φ⁴ theories near six dimensions, Phys. Rev. D 93, 085005 (2016)

• L. Classen, I. F. Herbut, L. Janssen, and M. M. Scherer, Competition of density waves and quantum multicritical behavior in Dirac materials from functional renormalization, Phys. Rev. B 93, 125119 (2016)

• F. Gehring, H. Gies, and L. Janssen, Fixed-point structure of low-dimensional relativistic fermion field theories: Universality classes and emergent symmetry, Phys. Rev. D 92, 085046 (2015)

• L. Janssen and I. F. Herbut, Nematic quantum criticality in three-dimensional Fermi system with quadratic band touching, Phys. Rev. B 92, 045117 (2015)

• L. Classen, I. F. Herbut, L. Janssen, and M. M. Scherer, Mott multicriticality of Dirac electrons in graphene, Phys. Rev. B 92, 035429 (2015)

• I. F. Herbut and L. Janssen, Topological Mott Insulator in Three-Dimensional Systems with Quadratic Band Touching, Phys. Rev. Lett. 113, 106401 (2014)

• J. Braun, H. Gies, L. Janssen, and D. Roscher, Phase Structure of Many-Flavor QED₃, Phys. Rev. D 90, 036002 (2014)

• L. Janssen and I. F. Herbut, Antiferromagnetic critical point on graphene’s honeycomb lattice: A functional renormalization group approach, Phys. Rev. B 89, 205403 (2014)

• L. Janssen and H. Gies, Critical behavior of the (2+1)-dimensional Thirring model, Phys. Rev. D 86, 105007 (2012)

• H. Gies and L. Janssen, UV fixed-point structure of the three-dimensional Thirring model, Phys. Rev. D 82, 085018 (2010)

• H. Gies, L. Janssen, S. Rechenberger, and M. M. Scherer, Phase transition and critical behavior of d = 3 chiral fermion models with left-right asymmetry, Phys. Rev. D 81, 025009 (2010)

• W. Brendel, F. Bruckmann, L. Janssen, A. Wipf, and C. Wozar, Instanton constituents and fermionic zero modes in twisted CPⁿ models, Phys. Lett. B 676, 116 (2009)