98 citations · 408 across the 18 of their papers we have counts for
18 papers
Kinetically induced order from mobility-constrained excitations
Aprem P. Joy, Urban F. P. Seifert
A fascinating feature of strongly correlated systems is that excitations may carry nontrivial quantum numbers under emergent symmetries which, in some cases, may strongly constrain…
Anisotropic vacancy-induced magnetization textures in altermagnets
Ruben Burkard, Mathias S. Scheurer, Urban F. P. Seifert
We study magnetic textures induced by vacancies in altermagnets using microscopic simulations and low-energy field theory. We show that a vacancy generically produces a real-space…
Mott insulators in moiré transition metal dichalcogenides at fractional fillings: Slave-rotor mean-field theory
Zhenhao Song, Urban F. P. Seifert, Zhu-Xi Luo +1
In this work, we study a slave-rotor mean-field theory of an extended Hubbard model, applicable to transition metal dichalcogenide moiré systems, that captures both the formation o…
Spin-Peierls instability of the U(1) Dirac spin liquid
Urban F. P. Seifert, Josef Willsher, Markus Drescher +2
A complicating factor in the realization and observation of quantum spin liquids in materials is the ubiquitous presence of other degrees of freedom, in particular lattice distorti…
Wegner's Ising gauge spins versus Kitaev's Majorana partons: Mapping and application to anisotropic confinement in spin-orbital liquids
Urban F. P. Seifert, Sergej Moroz
Emergent gauge theories take a prominent role in the description of quantum matter, supporting deconfined phases with topological order and fractionalized excitations. A common con…
Spin-polarons and ferromagnetism in doped dilute Wigner-Mott insulators
Urban F. P. Seifert, Leon Balents
Moiré heterostructures of transition metal dichalcogenides exhibit Mott-insulating behaviour both at half-filling as well as at fractional fillings, where electronic degrees of fre…
Twisted bilayer U(1) Dirac spin liquids
Zhu-Xi Luo, Urban F. P. Seifert, Leon Balents
When two layers of two-dimensional materials are assembled with a relative twist, moiré patterns arise, inducing a tremendous wealth of exotic phenomena. In this work, we consider…
Phase diagrams and excitations of anisotropic quantum magnets on the triangular lattice
Urban F. P. Seifert, Lucile Savary
The bilinear-biquadratic Heisenberg exchange model on the triangular lattice with a single-ion anisotropy has previously been shown to host a number of exotic magnetic and ne…
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…
Ultrafast optical excitation of magnetic dynamics in van der Waals magnets: Coherent magnons and BKT dynamics in NiPS
Urban F. P. Seifert, Mengxing Ye, Leon Balents
Optical pump-probe experiments carried out in the time domain reveal both the intrinsic low energy dynamics and its connections to higher energy excitations in correlated electron…
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…
Microscopic models for Kitaev's sixteenfold way of anyon theories
Sreejith Chulliparambil, Urban F. P. Seifert, Matthias Vojta +2
In two dimensions, the topological order described by gauge theory coupled to free or weakly interacting fermions with a nonzero spectral Chern number is classif…
Optical excitation of magnons in an easy-plane antiferromagnet: Application to SrIrO
Urban F. P. Seifert, Leon Balents
We study the interaction of a (classical) light field with the magnetic degrees of freedom in the two-dimensional antiferromagnet SrIrO. The reduced space group symmetry of…
Theory of partial quantum disorder in the stuffed honeycomb Heisenberg antiferromagnet
Urban F. P. Seifert, Matthias Vojta
Recent numerical results [Gonzalez , Phys. Rev. Lett. , 017201 (2019); Shimada , J. Phys. Conf. Ser. , 012126 (2018)]…
Bilayer Kitaev models: Phase diagrams and novel phases
Urban F. P. Seifert, Julian Gritsch, Erik Wagner +4
Kitaev's honeycomb-lattice spin- model has become a paradigmatic example for quantum spin liquids, both gapped and gapless. Here we study the fate of these spin…
Fractionalized Fermi liquids and exotic superconductivity in the Kitaev-Kondo lattice
Urban F. P. Seifert, Tobias Meng, Matthias Vojta
Fractionalized Fermi liquids (FL) have been introduced as non-Fermi-liquid metallic phases, characterized by coexisting electron-like charge carriers and local moments which…
Persisting correlations of a central spin coupled to large spin baths
Urban Seifert, Philip Bleicker, Philipp Schering +2
The decohering environment of a quantum bit is often described by the coupling to a large bath of spins. The quantum bit itself can be seen as a spin which is commonly call…