A5010578737- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magneto-Optical Properties and Applications
- Organic and Molecular Conductors Research
- Heusler alloys: electronic and magnetic properties
- Quantum many-body systems
- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Magnetism in coordination complexes
- Multiferroics and related materials
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular spectroscopy and chirality
- Scientific Computing and Data Management
- Perovskite Materials and Applications
- Modular Robots and Swarm Intelligence
- Inorganic Fluorides and Related Compounds
- Advanced Materials and Mechanics
- Research Data Management Practices
- Solid-state spectroscopy and crystallography
- 2D Materials and Applications
- Advanced NMR Techniques and Applications
- Opinion Dynamics and Social Influence
- Magnetic and transport properties of perovskites and related materials
- Quantum, superfluid, helium dynamics
Paul Scherrer Institute
2012-2025
Novo Nordisk (Denmark)
2025
European Spallation Source
2022
University of Geneva
2017-2020
London Centre for Nanotechnology
2012-2017
University College London
2012-2017
Bristol Robotics Laboratory
2012
Abstract Supersymmetry is an algebraic property of a quantum Hamiltonian that, by giving every boson fermionic superpartner and vice versa, may underpin physics beyond the Standard Model. Fractional bosonic quasiparticles are familiar in condensed matter, as spin charge excitations t - J model describing electron dynamics one-dimensional materials, but this type symmetry almost unknown. However, triplet ladder applied magnetic field provide supersymmetric analogue chain. Here we perform...
The magnetic insulator Yttrium Iron Garnet can be grown with exceptional quality, has a ferrimagnetic transition temperature of nearly 600 K, and is used in microwave spintronic devices that operate at room temperature. most accurate prior measurements the magnon spectrum date back 40 years, but cover only 3 lowest energy modes out 20 distinct branches. Here we have time-of-flight inelastic neutron scattering to measure full throughout Brillouin zone. We find existing model excitation...
Magnetic insulators have proven to be usable as quantum simulators for itinerant interacting systems. In particular the compound (C$_{5}$H$_{12}$N)$_{2}$CuBr$_{4}$ (short (Hpip)$_{2}$CuBr$_{4}$) was shown a remarkable realization of Tomonaga-Luttinger liquid (TLL) and allowed quantitatively test TLL theory. Substitution weakly disorders this class compounds allows thus use them tackle questions pertaining effect disorder in well, such formation Bose glass. As first step direction we present...
We present measurements of the magnetic entropy landscape and Gr\"uneisen parameter ${\mathrm{Cu}}^{2+}$ complex $({\mathrm{C}}_{5}{\mathrm{H}}_{12}\mathrm{N}{)}_{2}\mathrm{Cu}{\mathrm{Cl}}_{4}$ in a field. Our thermodynamic are very good agreement with theoretical description by $S=1/2$ Heisenberg ladder model. Due to its excellent experimental access, compound crosses two quantum critical points applied range field, first from gapped unpolarized state phase then fully polarized state. This...
The challenge of one-dimensional systems is to understand their physics beyond the level known elementary excitations. By high-resolution neutron spectroscopy in a quantum spin-ladder material, we probe leading multiparticle excitation by characterizing two-magnon bound state at zero field. applying high magnetic fields, create and select singlet (longitudinal) triplet (transverse) excitations fully spin-polarized ladder, which have not been observed previously are close analogs modes...
Chemical substitution in Sr${}_{2}$CuTe${}_{1\ensuremath{-}x}$W${}_{x}$O${}_{6}$ introduces a combination of randomness and frustration the square-lattice Heisenberg quantum antiferromagnet. Neutron scattering is used to probe ground excited states mixed compounds this series. It demonstrated that random network interactions only mildly frustrated. A semiclassical mean-field treatment random-bond model, which produces state small weakly interlinked ordered patches hosting spin-wave-like...
We have used neutron spectroscopy to investigate the spin dynamics of quantum (S=1/2) antiferromagnetic Ising chains in RbCoCl_{3}. The structure and magnetic interactions this material conspire produce two phase transitions at low temperatures, presenting an ideal opportunity for thermal control chain environment. high-resolution spectra we measure two-domain-wall excitations therefore characterize precisely both continuum response isolated "Zeeman-ladder" bound states three different...
We present the results of muon-spin spectroscopy ($\mu^{+}$SR) measurements on molecular spin ladder system (Hpip)$_{2}$CuBr$_{4(1-x)}$Cl$_{4x}$, [Hpip=(C$_{5}$H$_{12}$N)]. Using transverse field $\mu^{+}$SR we are able to identify characteristic behaviour in each regions phase diagram $x=0$ strong-rung (Hpip)$_{2}$CuBr$_4$. Comparison our those dimer-based magnet Cu(pyz)(gly)(ClO$_{4}$) shows several common features. locate crossovers partially disordered...
Supersymmetry is an algebraic property of a class quantum Hamiltonians, guiding principle used in the development nuclear theory and concept that may underpin physics beyond Standard Model. In condensed matter, any symmetry between bosonic fermionic entities usually strongly broken, as for spin charge sectors $t$-$J$ model describing dynamics fractionalized electrons one-dimensional materials. While triplet excitations ladder applied magnetic field provide close analogue chain,...
On January 30 to February 3, 2017, a group of 29 scientists from the UK, Europe, and beyond gathered at ISIS for joint workshop on HORACE SpinW software packages (Figure 1). is s...