Chirality of matter shows up via spin excitations

S. Bordács, I. Kézsmárki, D. Szaller, L. Demkó, N. Kida, H. Murakawa, Y. Onose, R. Shimano, T. Rõõm, U. Nagel, S. Miyahara, N. Furukawa, Y. Tokura

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

An object is considered chiral if its mirror image cannot be brought to coincide with itself by any sequence of simple rotations and translations 1. Chirality on a microscopic scale - in molecules 2,3, clusters 4, crystals 5 and metamaterials 6,7 - can be detected by differences in the optical response of a substance to right- and left-handed circularly polarized light 2,3. Such 'optical activity' is generally considered to be a consequence of the specific distribution of electronic charge within chiral materials. Here, we demonstrate that a similar response can also arise as a result of spin excitations in a magnetic material. Besides this spin-mediated optical activity (SOA), we observe notable differences in the response of Ba 2CoGe 2 O 7 - a square-lattice antiferromagnet that undergoes a magnetic-field driven transition to a chiral form - to terahertz radiation travelling parallel or antiparallel to an applied magnetic field. At certain frequencies the strength of this magneto-chiral effect is almost complete, with the difference between parallel and antiparallel absorption of the material approaching 100%. We attribute these phenomena to the magnetoelectric nature of spin excitations as they interact with the electric and magnetic components of light.

Original languageEnglish
Pages (from-to)734-738
Number of pages5
JournalNature Physics
Volume8
Issue number10
DOIs
Publication statusPublished - Oct 2012

Fingerprint

chirality
optical activity
excitation
magnetic materials
magnetic fields
polarized light
mirrors
radiation
electronics
crystals
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Bordács, S., Kézsmárki, I., Szaller, D., Demkó, L., Kida, N., Murakawa, H., ... Tokura, Y. (2012). Chirality of matter shows up via spin excitations. Nature Physics, 8(10), 734-738. https://doi.org/10.1038/nphys2387

Chirality of matter shows up via spin excitations. / Bordács, S.; Kézsmárki, I.; Szaller, D.; Demkó, L.; Kida, N.; Murakawa, H.; Onose, Y.; Shimano, R.; Rõõm, T.; Nagel, U.; Miyahara, S.; Furukawa, N.; Tokura, Y.

In: Nature Physics, Vol. 8, No. 10, 10.2012, p. 734-738.

Research output: Contribution to journalArticle

Bordács, S, Kézsmárki, I, Szaller, D, Demkó, L, Kida, N, Murakawa, H, Onose, Y, Shimano, R, Rõõm, T, Nagel, U, Miyahara, S, Furukawa, N & Tokura, Y 2012, 'Chirality of matter shows up via spin excitations', Nature Physics, vol. 8, no. 10, pp. 734-738. https://doi.org/10.1038/nphys2387
Bordács S, Kézsmárki I, Szaller D, Demkó L, Kida N, Murakawa H et al. Chirality of matter shows up via spin excitations. Nature Physics. 2012 Oct;8(10):734-738. https://doi.org/10.1038/nphys2387
Bordács, S. ; Kézsmárki, I. ; Szaller, D. ; Demkó, L. ; Kida, N. ; Murakawa, H. ; Onose, Y. ; Shimano, R. ; Rõõm, T. ; Nagel, U. ; Miyahara, S. ; Furukawa, N. ; Tokura, Y. / Chirality of matter shows up via spin excitations. In: Nature Physics. 2012 ; Vol. 8, No. 10. pp. 734-738.
@article{02d8c1a3ff474646ab1d3f8e32202751,
title = "Chirality of matter shows up via spin excitations",
abstract = "An object is considered chiral if its mirror image cannot be brought to coincide with itself by any sequence of simple rotations and translations 1. Chirality on a microscopic scale - in molecules 2,3, clusters 4, crystals 5 and metamaterials 6,7 - can be detected by differences in the optical response of a substance to right- and left-handed circularly polarized light 2,3. Such 'optical activity' is generally considered to be a consequence of the specific distribution of electronic charge within chiral materials. Here, we demonstrate that a similar response can also arise as a result of spin excitations in a magnetic material. Besides this spin-mediated optical activity (SOA), we observe notable differences in the response of Ba 2CoGe 2 O 7 - a square-lattice antiferromagnet that undergoes a magnetic-field driven transition to a chiral form - to terahertz radiation travelling parallel or antiparallel to an applied magnetic field. At certain frequencies the strength of this magneto-chiral effect is almost complete, with the difference between parallel and antiparallel absorption of the material approaching 100{\%}. We attribute these phenomena to the magnetoelectric nature of spin excitations as they interact with the electric and magnetic components of light.",
author = "S. Bord{\'a}cs and I. K{\'e}zsm{\'a}rki and D. Szaller and L. Demk{\'o} and N. Kida and H. Murakawa and Y. Onose and R. Shimano and T. R{\~o}{\~o}m and U. Nagel and S. Miyahara and N. Furukawa and Y. Tokura",
year = "2012",
month = "10",
doi = "10.1038/nphys2387",
language = "English",
volume = "8",
pages = "734--738",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "10",

}

TY - JOUR

T1 - Chirality of matter shows up via spin excitations

AU - Bordács, S.

AU - Kézsmárki, I.

AU - Szaller, D.

AU - Demkó, L.

AU - Kida, N.

AU - Murakawa, H.

AU - Onose, Y.

AU - Shimano, R.

AU - Rõõm, T.

AU - Nagel, U.

AU - Miyahara, S.

AU - Furukawa, N.

AU - Tokura, Y.

PY - 2012/10

Y1 - 2012/10

N2 - An object is considered chiral if its mirror image cannot be brought to coincide with itself by any sequence of simple rotations and translations 1. Chirality on a microscopic scale - in molecules 2,3, clusters 4, crystals 5 and metamaterials 6,7 - can be detected by differences in the optical response of a substance to right- and left-handed circularly polarized light 2,3. Such 'optical activity' is generally considered to be a consequence of the specific distribution of electronic charge within chiral materials. Here, we demonstrate that a similar response can also arise as a result of spin excitations in a magnetic material. Besides this spin-mediated optical activity (SOA), we observe notable differences in the response of Ba 2CoGe 2 O 7 - a square-lattice antiferromagnet that undergoes a magnetic-field driven transition to a chiral form - to terahertz radiation travelling parallel or antiparallel to an applied magnetic field. At certain frequencies the strength of this magneto-chiral effect is almost complete, with the difference between parallel and antiparallel absorption of the material approaching 100%. We attribute these phenomena to the magnetoelectric nature of spin excitations as they interact with the electric and magnetic components of light.

AB - An object is considered chiral if its mirror image cannot be brought to coincide with itself by any sequence of simple rotations and translations 1. Chirality on a microscopic scale - in molecules 2,3, clusters 4, crystals 5 and metamaterials 6,7 - can be detected by differences in the optical response of a substance to right- and left-handed circularly polarized light 2,3. Such 'optical activity' is generally considered to be a consequence of the specific distribution of electronic charge within chiral materials. Here, we demonstrate that a similar response can also arise as a result of spin excitations in a magnetic material. Besides this spin-mediated optical activity (SOA), we observe notable differences in the response of Ba 2CoGe 2 O 7 - a square-lattice antiferromagnet that undergoes a magnetic-field driven transition to a chiral form - to terahertz radiation travelling parallel or antiparallel to an applied magnetic field. At certain frequencies the strength of this magneto-chiral effect is almost complete, with the difference between parallel and antiparallel absorption of the material approaching 100%. We attribute these phenomena to the magnetoelectric nature of spin excitations as they interact with the electric and magnetic components of light.

UR - http://www.scopus.com/inward/record.url?scp=84867206668&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867206668&partnerID=8YFLogxK

U2 - 10.1038/nphys2387

DO - 10.1038/nphys2387

M3 - Article

AN - SCOPUS:84867206668

VL - 8

SP - 734

EP - 738

JO - Nature Physics

JF - Nature Physics

SN - 1745-2473

IS - 10

ER -