Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-02-18
J. Phys.: Conf. Ser. 320, 012082 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 3 figures, submitted to proceedings of ICFCM 2011
Scientific paper
10.1088/1742-6596/320/1/012082
Chirality, i.e., the right- and left-handedness of structure, is one of the key concepts in many fields of science including biology, chemistry and physics, and its manipulation is an issue of vital importance. The electron spins in solids can form chiral configurations. In perovskite manganites RMnO3 (R=Tb, Dy,...etc), the Mn-spins form a cycloidal structure, which induces ferroelectric polarization (P) through the relativistic spin-orbit interaction. This magnetism-induced ferroelectricity (multiferroics) and associated infrared-active spin waves (electromagnons) open a promising route to control the spins by purely electric means in a very short time. In this paper, we show theoretically with an accurate spin Hamiltonian for TbMnO3 that a picosecond optical pulse can switch the spin chirality by intensely exciting the electromagnons with a terahertz frequency.
Mochizuki Masahito
Nagaosa Naoto
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