However, more » at moderate energies, the spectrum is unconventional and the response shows evidence for fractional excitations. In the absence of a magnetic field this material orders at a finite temperature and exhibits low-energy spin wave excitations. Consequently, there has been enormous interest in exploring possible material realizations of Kitaev physics and several candidate materials have been put forward, recently including α-RuCl 3.
Upon breaking of time-reversal symmetry, for example in an external magnetic field, these fractionalized quasiparticles acquire non-Abelian exchange statistics, an important ingredient for topologically protected quantum computing. The celebrated Kitaev quantum spin liquid (QSL) is the paradigmatic example of a topological magnet with emergent excitations in the form of Majorana Fermions and gauge fluxes. Materials Sciences & Engineering Division OSTI Identifier: 1606655 Alternate Identifier(s): OSTI ID: 1780971 Grant/Contract Number: AC05-00OR22725 SC0018675 Resource Type: Accepted Manuscript Journal Name: npj Quantum Materials Additional Journal Information: Journal Volume: 5 Journal Issue: 1 Journal ID: ISSN 2397-4648 Publisher: Nature Publishing Group Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed-matter physics Magnetic properties and = , (ORNL), Oak Ridge, TN (United States) Boston College, Chestnut Hill, MA (United States) Sponsoring Org.: USDOE Office of Science (SC), Basic Energy Sciences (BES). Publication Date: Wed Mar 04 00:00: Research Org.: Oak Ridge National Lab.
Moreover, we further confirm the fractional nature of the magnetic excitations, which is given by creating a pair of fermionic quasiparticles. Here, we identify the energy and temperature boundaries of non-Kitaev interactions by direct comparison of the Raman susceptibility of α-RuCl3 with quantum Monte Carlo (QMC) results for the Kitaev QSL. A key challenge in real materials is identifying the relative size of the non-Kitaev terms and their role in the emergence or suppression of fractional excitations. This exactly solvable model involves a highly entangled state resulting from bond-dependent Ising interactions that produce excitations which are non-local in terms of spin flips. AbstractSignificant efforts have focused on the magnetic excitations of relativistic Mott insulators, predicted to realize the Kitaev quantum spin liquid (QSL).
0 kommentar(er)
