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4시 20분부터 제1과학관 31214 e+강의실에서 간단한 다과를 제공합니다.

아 래

Title: Majorana quasiparticles emergent in Kitaev quantum magnets

Speaker: 최   광   용  교수님 (중앙대학교)

Date & Time: April. 5. (Wed.) 2017, 4:30 PM

Place: Natural Science 1,  Room No. 31214

Abstract: Quantum spin liquids are a long-range quantum entangled state that entails topological order and fractionalization of constituent magnetic moments. Their physical realization holds promise for the implementation of decoherence-free quantum computer and provides a unified conceptual framework that underpins dark matter in universe, composite fermions in quantum Hall liquids, magnetic monopoles in spin ices, and spinons in frustrated magnets. The Kitaev honeycomb lattice is envisioned as an ideal host for Majorana quasiparticles that are created out of the spin liquid vacuum. In this talk, we will present experimental signatures of Majorana fermions emergent in Kitaev materials: the 2D honeycomb lattice α-RuCl3 and the harmonic-honeycomb iridates β- and γ-Li2IrO3. In α-RuCl3 extensive thermodynamic and spectroscopic measurements unveil two distinct characters of fractionalized excitations as a result of thermal fractionalization of s=1/2 spins. In the hyperhoneycomb iridates, polarization-resolved Raman spectroscopy shows a thermal damping of fermionic excitations, expanding the concept of fractionalized quasiparticles to a 3D Kitaev-Heisenberg spin system.