187 citations · 944 across the 36 of their papers we have counts for
14 papers · 1 filter
Concentration-Free Quantum Kernel Learning in the Rydberg Blockade
Ayana Sarkar, Martin Schnee, Sangeeth Das Kallullathil +4
Quantum kernel methods (QKMs) offer an appealing framework for machine learning on near-term quantum computers. However, QKMs generically suffer from exponential concentration, req…
Resonant inelastic X-ray scattering in the topological semimetal FeSi
Yao Shen, Anirudh Chandrasekaran, Jennifer Sears +8
The energy spectrum of topological semimetals contains protected degeneracies in reciprocal space that correspond to Weyl, Dirac, or multifold fermionic states. To exploit the unco…
Observing spin fractionalization in the Kitaev spin liquid via temperature evolution of indirect resonant inelastic x-ray scattering
Gábor B. Halász, Stefanos Kourtis, Johannes Knolle +1
Motivated by the ongoing effort to search for high-resolution signatures of quantum spin liquids, we investigate the temperature dependence of the indirect resonant inelastic x-ray…
Quantum spin liquid at finite temperature: proximate dynamics and persistent typicality
I. Rousochatzakis, S. Kourtis, J. Knolle +2
Quantum spin liquids are long-range entangled states of matter with emergent gauge fields and fractionalized excitations. While candidate materials, such as the Kitaev honeycomb ru…
Scrambling via Braiding of Nonabelions
Zhi-Cheng Yang, Konstantinos Meichanetzidis, Stefanos Kourtis +1
We study how quantum states are scrambled via braiding in systems of non-Abelian anyons through the lens of entanglement spectrum statistics. In particular, we focus on the degree…
Symmetry breaking and fermionic fractional Chern insulator in topologically trivial bands
Stefanos Kourtis
We describe a mechanism by which fermions in topologically trivial bands can form correlated states exhibiting a fractional quantum Hall (FQH) effect upon introduction of strong re…
Weyl-type topological phase transitions in fractional quantum Hall like systems
Stefanos Kourtis, Titus Neupert, Christopher Mudry +2
We develop a method to characterize topological phase transitions for strongly correlated Hamiltonians defined on two-dimensional lattices based on the many-body Berry curvature. O…
Free coherent spinons in quantum square ice
Stefanos Kourtis, Claudio Castelnovo
We investigate the quantum dynamics of monopole-like excitations in quantum square ice, as captured by the strongly anisotropic spin-1/2 XXZ model on the checkerboard lattice. We o…
Fractional Chern insulators with strong interactions far exceeding bandgaps
Stefanos Kourtis, Titus Neupert, Claudio Chamon +1
We study two models for spinless fermions featuring topologically non-trivial bands characterized by Chern numbers at fractional filling. Using exact diagonalization, we s…
Femtosecond dynamics of magnetic excitations from resonant inelastic x-ray scattering in CaCu2O3
Valentina Bisogni, Stefanos Kourtis, Claude Monney +10
Taking spinon excitations in the quantum antiferromagnet CaCu2O3 as an example, we demonstrate that femtosecond dynamics of magnetic excitations can be probed by direct resonant in…
Combined topological and Landau order from strong correlations in Chern bands
Stefanos Kourtis, Maria Daghofer
We present a class of states with both topological and conventional Landau order that arise out of strongly interacting spinless fermions in fractionally filled and topologically n…
Fractional Chern insulator on a triangular lattice of strongly correlated electrons
Stefanos Kourtis, Jörn W. F. Venderbos, Maria Daghofer
We discuss the low-energy limit of three-orbital Kondo-lattice and Hubbard models describing orbitals on a triangular lattice near half-filling. We analyze how very flat b…
Exact diagonalization results for resonant inelastic x-ray scattering spectra of one-dimensional Mott insulators
Stefanos Kourtis, Jeroen van den Brink, Maria Daghofer
We examine the momentum-dependent excitation spectra of indirect as well as direct resonant inelastic x-ray scattering (RIXS) processes in half-filled (extended) Hubbard rings. We…
Fractional quantum-Hall liquid spontaneously generated by strongly correlated t_2g electrons
Jörn W. F. Venderbos, Stefanos Kourtis, Jeroen van den Brink +1
For topologically nontrivial and very narrow bands, Coulomb repulsion between electrons has been predicted to give rise to a spontaneous fractional quantum-Hall (FQH) state in abse…