APCTP	■ Introduction · Greetings · Milestones · Organization Chart · Board Members · Staff Members · Former Board Members · Annual Reports · APCTP Logo · Contact us ■ Members · Member Countries · Partnership Institutions ■ Media · APCTP in Media · AAPPS Bulletin ■ Visitor Information · Plan Your Visit · Directions · Tips for Visitors · Facilities Guide · Map ■ Sponsors

Activities	■ Scientific Activities · Scientific Programs · Seminars & Lectures · ICTP Affiliated Center (ICAC) · Scientific Calendar · Call for Programs · Past Scientific Programs · Past Seminars & Lectures · Payment ■ Awards and Visitors · Benjamin Lee Professorship · Visitors · Visitor Information · Visitor Application ■ Outreach Programs · Web Journal <Crossroads> · APCTP Books · Events · Science at Pohang · Past Events

Research	■ Junior Research Groups ■ Young Scientist Training Program ■ Senior Advisory Group ■ APCTP-POSTECH Fellows ■ Publications

Asia Pacific Network	■ Academic Activities in the AP Region · Seminars at IBS: Theoretical Physics of Complex Systems · Center For QUANTUM SPACETIME · Association of Asia Pacific Physical Societies · FIST - Asia Network on HEP · ANPhA - Asian Nuclear Physics Association · APCTP Japan Committee · ICTP Asian Network on Condensed Matter and Complex Systems

Seminars & Lectures

* TITLE

Chiral spin order and electromagnetic dynamics in one-dimensional multiferroic cuprates

* SPEAKERS

Name	Affiliation	E-mail
Dr. Shigeki Onoda	RIKEN	Prof. Ki-Seok Kim (kimks(at)apctp.org)

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2010-06-03, 14:00-15:20pm

* PLACE

Conference room 503, APCTP Headquarters

* ABSTRACT

The chiral spin order breaking the parity symmetry and the associated electromagnetic excitations have been highlighted by a recently discovered multiferroic behaviour, a ferroelectricity induced by spin cycloids. In spite of advances in theoretical understanding of the static magnetoelectric effect, the dynamical effects remain controversial. A comprehensive theory explaining how electronic spins manifest themselves in the electromagnetic dynamics is called for. Here, we develop the realistic theory for quasi-one-dimensional multiferroic cuprates. We show that the emergence of the spin chirality originates from the ferromagnetic nature of the nearest-neighbor exchange coupling in the spin chains. This bears gapless continuum dielectric spectrum due to spinons, if the inter-chain couplings are significantly weak as in LiCuVO4 and Rb2Cu2Mo3O12. On the other hand, our realistic spin-wave calculation for LiCu2O2 with moderate inter-chain couplings resolves many puzzles and controversies over the helical magnetic structure and the pseudo-Nambu-Goldstone modes as the origin of experimentally observed electromagnons.

Map

How to get to APCTP

Scientific Activities Calendar

Scientific programs

Modal title

Modal title