240 citations · 1.1k across the 36 of their papers we have counts for
31 papers · 1 filter
Quantum Fisher Information in semiclassical magnon systems
Wolfgang Simeth, Pontus Laurell, Allen Scheie
Quantum Fisher Information (QFI) is a powerful spectroscopic tool to witness many-body quantum entanglement in solid state materials, but it is not always obvious how to relate it…
Kinetic obstruction to pairing in the doped Kitaev-Heisenberg ladder
Bradraj Pandey, Bo Xiao, Satoshi Okamoto +4
We investigate the hole-doped Kitaev-Heisenberg (--) model on a two-leg ladder geometry using the density-matrix renormalization group (DMRG). We first consider the behavi…
Nonlinear light cone spreading of correlations in a triangular quantum magnet: a hard quantum simulation target
A. Scheie, J. Willsher, E. A. Ghioldi +6
Dynamical correlations of quantum many-body systems are typically analyzed in the momentum space and frequency basis. However, quantum simulators operate more naturally in real spa…
Spinon excitations and spin correlations in the one-dimensional quantum magnet -VOSO probed by Raman spectroscopy
Dirk Wulferding, Diana Lucia Quintero-Castro, Pontus Laurell +3
Fractionalized excitations such as spinons and anyons have emerged as a central theme in condensed matter physics with broad implications for superconductivity, quantum statistics,…
Simulation of Topological -Gates via Braiding of Majorana Zero Modes in an Interacting Quantum Dot System
Bradraj Pandey, Satoshi Okamoto, Pontus Laurell +2
Recent advances in quantum dot platforms have opened new pathways for realizing Majorana zero modes (MZMs) and simulating topological quantum computation. Here we propose an experi…
Intertwined charge, spin, and orbital degrees of freedom under electronic correlations in the one-dimensional Fe chalcogenide chain
Yang Zhang, Pontus Laurell, Gonzalo Alvarez +4
Motivated by recent developments in the study of quasi-one-dimensional iron systems with Fe, we comprehensively study the Fe chalcogenide chain system. Based on first…
Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder
A. Scheie, P. Laurell, J. Thomas +14
We investigate the spin dynamics of the cuprate ladder SrCaCuO to elucidate the behavior of its intrinsically doped holes. Combining high-resolution…
Tutorial: Extracting entanglement signatures from neutron spectroscopy
Allen Scheie, Pontus Laurell, Wolfgang Simeth +2
This tutorial is a pedagogical introduction to recent methods of computing quantum spin entanglement witnesses from spectroscopy, with a special focus on neutron scattering on quan…
Pairing tendencies in the doped Kitaev-Heisenberg model
Pontus Laurell, Bradraj Pandey, Gábor B. Halász +3
We study the impact of hole-doping on the Kitaev-Heisenberg model on the honeycomb lattice. We investigate the pairing tendencies and correlation functions in the framework of a $t…
Spectrum and low-temperature bulk properties of triangular quantum spin liquid candidate NaYbSe
A. O. Scheie, Minseong Lee, Kevin Wang +18
We report neutron scattering, pressure-dependent AC calorimetry, and AC magnetic susceptibility measurements of triangular lattice NaYbSe. We observe a continuum of scattering,…
Luther-Emery liquid and dominant singlet superconductivity in the hole-doped Haldane spin-1 chain
Pontus Laurell, Jacek Herbrych, Gonzalo Alvarez +1
We investigate the pairing tendencies in the hole-doped Haldane spin-1 chain. To allow for doping, we extend the original spin chain Hamiltonian into a fermionic model involving a…
Spinon continuum in the Heisenberg quantum chain compound SrVO
Shang Gao, Ling-Fang Lin, Pontus Laurell +11
Magnetic excitations in the spin chain candidate SrVO have been investigated by inelastic neutron scattering on a single crystal sample. A spinon continuum with a bandw…
Reconstructing the spatial structure of quantum correlations in materials
Allen Scheie, Pontus Laurell, Elbio Dagotto +2
Quantum correlations are a fundamental property of quantum many-body states. Yet they remain experimentally elusive, hindering certification of genuine quantum behavior, especially…
Spin dynamics of the generalized quantum spin compass chain
Pontus Laurell, Gonzalo Alvarez, Elbio Dagotto
We calculate the dynamical spin structure factor of the generalized spin- compass spin chain using the density matrix renormalization group. The model, also known as the twist…
Spin sensitive transport in RuCl_3/Pt heterostructures: revealing a field-transverse spin anisotropy in a spin liquid candidate
H. Idzuchi, M. Kimata, S. Okamoto +7
Alpha-phase (a-) RuCl_3 has emerged as a possible candidate for a quantum spin liquid (QSL) that promises exotic quasi-particles relevant for fault-tolerant quantum computation. He…
Magnetic excitations, non-classicality and quantum wake spin dynamics in the Hubbard chain
Pontus Laurell, Allen Scheie, D. Alan Tennant +3
Recent work has demonstrated that quantum Fisher information (QFI), a witness of multipartite entanglement, and magnetic Van Hove correlations , a probe of local real-space…
Extraction of the interaction parameters for RuCl from neutron data using machine learning
Anjana M. Samarakoon, Pontus Laurell, Christian Balz +6
Single crystal inelastic neutron scattering data contain rich information about the structure and dynamics of a material. Yet the challenge of matching sophisticated theoretical mo…
Quantum wake dynamics in Heisenberg antiferromagnetic chains
Allen Scheie, Pontus Laurell, Bella Lake +4
Traditional spectroscopy, by its very nature, characterizes properties of physical systems in the momentum and frequency domains. The most interesting and potentially practically u…
Dirac magnons, nodal lines, and nodal plane in elemental gadolinium
Allen Scheie, Pontus Laurell, Paul A. McClarty +4
We investigate the magnetic excitations of elemental gadolinium (Gd) using inelastic neutron scattering, showing that Gd is a Dirac magnon material with nodal lines at and noda…
Spin exchange Hamiltonian and topological degeneracies in elemental gadolinium
Allen Scheie, Pontus Laurell, Paul A. McClarty +4
We present a comprehensive study of the magnetic exchange Hamiltonian of elemental Gadolinium. We use neutron scattering to measure the magnon spectrum over the entire Brillouin zo…
Witnessing entanglement in quantum magnets using neutron scattering
A. Scheie, Pontus Laurell, A. M. Samarakoon +6
We demonstrate how quantum entanglement can be directly witnessed in the quasi-1D Heisenberg antiferromagnet KCuF. We apply three entanglement witnesses --- one-tangle, two-tan…
Quantifying and controlling entanglement in the quantum magnet CsCoCl
Pontus Laurell, Allen Scheie, Chiron J. Mukherjee +7
The lack of methods to experimentally detect and quantify entanglement in quantum matter impedes our ability to identify materials hosting highly entangled phases, such as quantum…
Exact resummation of the Holstein-Primakoff expansion and differential equation approach to operator square-roots
Michael Vogl, Pontus Laurell, Hao Zhang +2
Operator square-roots are ubiquitous in theoretical physics. They appear, for example, in the Holstein-Primakoff representation of spin operators and in the Klein-Gordon equation.…
Van Hove singularity in the magnon spectrum of the antiferromagnetic quantum honeycomb lattice
G. Sala, M. B. Stone, Binod K. Rai +12
The magnetic excitation spectrum of the quantum magnet YbCl is studied with inelastic neutron scattering. The spectrum exhibits an unusually sharp feature within a broad contin…