196 citations · 2.6k across the 56 of their papers we have counts for
56 papers
Interaction-induced nematic Dirac semimetal from quadratic band touching: A constrained-path quantum Monte Carlo study
Zi Hong Liu, Hongyu Lu, Zi Yang Meng +1
Electronic systems with quadratic band touchings, commonly found in two- and three-dimensional materials such as Bernal-stacked bilayer graphene, kagome metals, HgTe, and pyrochlor…
Gross-Neveu-XY quantum criticality in moiré Dirac materials
Bilal Hawashin, Michael M. Scherer, Lukas Janssen
Two-dimensional van-der-Waals materials offer a highly tunable platform for engineering electronic band structures and interactions. By employing techniques such as twisting, gatin…
Twist-tuned quantum criticality in moiré bilayer graphene
Jan Biedermann, Lukas Janssen
We argue that moiré bilayer graphene at charge neutrality hosts a continuous semimetal-to-insulator quantum phase transition that can be accessed experimentally by tuning the twist…
Critical properties of metallic and deconfined quantum phase transitions in Dirac systems
Zi Hong Liu, Matthias Vojta, Fakher F. Assaad +1
We characterize, by means of large-scale fermion quantum Monte Carlo simulations, metallic and deconfined quantum phase transitions in a bilayer honeycomb model in terms of their q…
Evolution of entanglement entropy at SU() deconfined quantum critical points
Menghan Song, Jiarui Zhao, Meng Cheng +4
Over the past two decades, the enigma of the deconfined quantum critical point (DQCP) has attracted broad attention across the condensed matter, quantum field theory, and high-ener…
Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material NaCoTeO
Xiaochen Hong, Matthias Gillig, Weiliang Yao +7
The recent report of a half-quantized thermal Hall effect in the Kitaev material -RuCl has sparked a strong debate on whether it is generated by Majorana fermion edge curren…
Quasiuniversality from all-in-all-out Weyl quantum criticality in pyrochlore iridates
David Jonas Moser, Lukas Janssen
We identify an exotic quasiuniversal behavior near the all-in-all-out Weyl quantum critical point in three-dimensional Luttinger semimetals, such as the pyrochlore iridates Ir…
Marginal Fermi liquid at magnetic quantum criticality from dimensional confinement
Bernhard Frank, Zi Hong Liu, Fakher F. Assaad +2
Metallic quantum criticality is frequently discussed as a source for non-Fermi liquid behavior, but controlled theoretical treatments are scarce. Here we identify and study a novel…
Triple-q order in NaCoTeO from proximity to hidden-SU(2)-symmetric point
Wilhelm G. F. Krüger, Wenjie Chen, Xianghong Jin +2
In extended Heisenberg-Kitaev-Gamma-type spin models, hidden-SU(2)-symmetric points are isolated points in parameter space that can be mapped to pure Heisenberg models via nontrivi…
Magnetic quantum phase transition in a metallic Kondo heterostructure
Zi Hong Liu, Bernhard Frank, Lukas Janssen +2
We consider a two-dimensional quantum spin system described by a Heisenberg model that is embedded in a three-dimensional metal. The two systems couple via an antiferromagnetic Kon…
Gross-Neveu-Heisenberg criticality from expansion
Konstantinos Ladovrechis, Shouryya Ray, Tobias Meng +1
The Gross-Neveu-Heisenberg universality class describes a continuous quantum phase transition between a Dirac semimetal and an antiferromagnetic insulator. Such quantum critical po…
Phase diagrams of SO() Majorana-Hubbard models: Dimerization, internal symmetry breaking, and fluctuation-induced first-order transitions
Lukas Janssen, Urban F. P. Seifert
We study the zero-temperature phase diagrams of Majorana-Hubbard models with SO() symmetry on two-dimensional honeycomb and -flux square lattices, using mean-field and renorm…
Nematic Quantum Criticality in Dirac Systems
Jonas Schwab, Lukas Janssen, Kai Sun +4
We investigate nematic quantum phase transitions in two different Dirac fermion models. The models feature twofold and fourfold, respectively, lattice rotational symmetries that ar…
Metallic and Deconfined Quantum Criticality in Dirac Systems
Zi Hong Liu, Matthias Vojta, Fakher F. Assaad +1
Motivated by the physics of spin-orbital liquids, we study a model of interacting Dirac fermions on a bilayer honeycomb lattice at half filling, featuring an explicit global SO(3)$…
Nesting instability of gapless U(1) spin liquids with spinon Fermi pockets in two dimensions
Wilhelm G. F. Krüger, Lukas Janssen
Quantum spin liquids are exotic states of matter that may be realized in frustrated quantum magnets and feature fractionalized excitations and emergent gauge fields. Here, we consi…
Gross-Neveu-Heisenberg criticality from competing nematic and antiferromagnetic orders in bilayer graphene
Shouryya Ray, Lukas Janssen
We study the phase diagram of an effective model of competing nematic and antiferromagnetic orders of interacting electrons on the Bernal-stacked honeycomb bilayer, as relevant for…
Fractionalized quantum criticality in spin-orbital liquids from field theory beyond the leading order
Shouryya Ray, Bernhard Ihrig, Daniel Kruti +3
Two-dimensional spin-orbital magnets with strong exchange frustration have recently been predicted to facilitate the realization of a quantum critical point in the Gross-Neveu-SO(3…
Field-induced intermediate ordered phase and anisotropic interlayer interactions in -RuCl
Christian Balz, Lukas Janssen, Paula Lampen-Kelley +6
In -RuCl, an external magnetic field applied within the honeycomb plane can induce a transition from a magnetically ordered state to a disordered state that is potentially r…
High-field thermal transport properties of the Kitaev quantum magnet alpha-RuCl3: evidence for low-energy excitations beyond the critical field
Richard Hentrich, Xiaochen Hong, Matthias Gillig +11
We investigate the phononic in-plane longitudinal low-temperature thermal conductivity kappa_ab of the Kitaev quantum magnet alpha-RuCl3 for large in-plane magnetic fields up to 33…
Flux crystals, Majorana metals, and flat bands in exactly solvable spin-orbital liquids
Sreejith Chulliparambil, Lukas Janssen, Matthias Vojta +2
Spin-orbital liquids are quantum disordered states in systems with entangled spin and orbital degrees of freedom. We study exactly solvable spin-orbital models in two dimensions wi…
Fractionalized fermionic quantum criticality in spin-orbital Mott insulators
Urban F. P. Seifert, Xiao-Yu Dong, Sreejith Chulliparambil +3
We study transitions between topological phases featuring emergent fractionalized excitations in two-dimensional models for Mott insulators with spin and orbital degrees of freedom…
Susceptibility anisotropy and its disorder evolution in models for Kitaev materials
Eric C. Andrade, Lukas Janssen, Matthias Vojta
Mott insulators with strong spin-orbit coupling display a strongly anisotropic response to applied magnetic fields. This applies in particular to Kitaev materials, with -RuCl$_3…
Heisenberg-Kitaev model in a magnetic field: expansion
Pedro M. Cônsoli, Lukas Janssen, Matthias Vojta +1
The exact solution of Kitaev's spin- honeycomb spin-liquid model has sparked an intense search for Mott insulators hosting bond-dependent Kitaev interactions, of which $\mathr…
Observation of a random singlet state in a diluted Kitaev honeycomb material
Seung-Ho Baek, Hyeon Woo Yeo, Seung-Hwan Do +4
We report a Cl nuclear magnetic resonance (NMR) study of the diluted Kitaev material -RuIrCl ( and ) where non-magnetic Ir dopants subs…