TY - JOUR
T1 - Quantum fluctuations of chirality in one-dimensional spin-1/2 multiferroics
T2 - Gapless dielectric response from phasons and chiral solitons
AU - Furukawa, Shunsuke
AU - Sato, Masahiro
AU - Saiga, Yasuhiro
AU - Onoda, Shigeki
PY - 2008/12
Y1 - 2008/12
N2 - We present a quantum theory for one-dimensional spin-1/2 multiferroics, where the vector spin chirality couples with the electric polarization. Based on exact diagonalization and bosonization, it is shown that quantum fluctuations appreciably reduce the chiral ordering amplitude and the associated ferroelectric polarization. This yields nearly collinear spin correlations in short-range scales, in qualitative agreement with recent neutron scattering experiments. There appear gapless chirality excitations described by phasons and new solitons, which can be experimentally verified from the low-energy dielectric response.
AB - We present a quantum theory for one-dimensional spin-1/2 multiferroics, where the vector spin chirality couples with the electric polarization. Based on exact diagonalization and bosonization, it is shown that quantum fluctuations appreciably reduce the chiral ordering amplitude and the associated ferroelectric polarization. This yields nearly collinear spin correlations in short-range scales, in qualitative agreement with recent neutron scattering experiments. There appear gapless chirality excitations described by phasons and new solitons, which can be experimentally verified from the low-energy dielectric response.
KW - Dielectric response
KW - Multiferroics
KW - Quantum spin systems
KW - Vector spin chirality
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U2 - 10.1143/JPSJ.77.123712
DO - 10.1143/JPSJ.77.123712
M3 - Article
AN - SCOPUS:57549091209
SN - 0031-9015
VL - 77
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 12
M1 - 123712
ER -