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2. Terahertz electric-field driven dynamical multiferroicity in SrTiO$_3$

Author

Basini, M., Pancaldi, M., Wehinger, B., Udina, M., Tadano, T., Hoffmann, M. C., Balatsky, A. V., and Bonetti, S.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

The emergence of collective order in matter is among the most fundamental and intriguing phenomena in physics. In recent years, the ultrafast dynamical control and creation of novel ordered states of matter not accessible in thermodynamic equilibrium is receiving much attention. Among those, the theoretical concept of dynamical multiferroicity has been introduced to describe the emergence of magnetization by means of a time-dependent electric polarization in non-ferromagnetic materials. In simple terms, a large amplitude coherent rotating motion of the ions in a crystal induces a magnetic moment along the axis of rotation. However, the experimental verification of this effect is still lacking. Here, we provide evidence of room temperature magnetization in the archetypal paraelectric perovskite SrTiO$_3$ due to this mechanism. To achieve it, we resonantly drive the infrared-active soft phonon mode with intense circularly polarized terahertz electric field, and detect a large magneto-optical Kerr effect. A simple model, which includes two coupled nonlinear oscillators whose forces and couplings are derived with ab-initio calculations using self-consistent phonon theory at a finite temperature, reproduces qualitatively our experimental observations on the temporal and frequency domains. A quantitatively correct magnitude of the effect is obtained when one also considers the phonon analogue of the reciprocal of the Einsten - de Haas effect, also called the Barnett effect, where the total angular momentum from the phonon order is transferred to the electronic one. Our findings show a new path for designing ultrafast magnetic switches by means of coherent control of lattice vibrations with light., Comment: Main text: 10 pages, 4 figures, methods and 8 supplemental figures

Published
2022
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4. Terahertz electric-field-driven dynamical multiferroicity in SrTiO3.

Author

Basini, M., Pancaldi, M., Wehinger, B., Udina, M., Unikandanunni, V., Tadano, T., Hoffmann, M. C., Balatsky, A. V., and Bonetti, S.

Abstract

The emergence of collective order in matter is among the most fundamental and intriguing phenomena in physics. In recent years, the dynamical control and creation of novel ordered states of matter not accessible in thermodynamic equilibrium is receiving much attention1–6. The theoretical concept of dynamical multiferroicity has been introduced to describe the emergence of magnetization due to time-dependent electric polarization in non-ferromagnetic materials7,8. In simple terms, the coherent rotating motion of the ions in a crystal induces a magnetic moment along the axis of rotation. Here we provide experimental evidence of room-temperature magnetization in the archetypal paraelectric perovskite SrTiO3 due to this mechanism. We resonantly drive the infrared-active soft phonon mode with an intense circularly polarized terahertz electric field and detect the time-resolved magneto-optical Kerr effect. A simple model, which includes two coupled nonlinear oscillators whose forces and couplings are derived with ab initio calculations using self-consistent phonon theory at a finite temperature9, reproduces qualitatively our experimental observations. A quantitatively correct magnitude was obtained for the effect by also considering the phonon analogue of the reciprocal of the Einstein–de Haas effect, which is also called the Barnett effect, in which the total angular momentum from the phonon order is transferred to the electronic one. Our findings show a new path for the control of magnetism, for example, for ultrafast magnetic switches, by coherently controlling the lattice vibrations with light.We demonstrate the emergence of magnetism induced by a terahertz electric field in SrTiO3. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Utilization of acid phosphatase for recycling-use of phosphorus

Author

Yamamura, T., Wasaki, J., Dateki, H., Shinano, T., Tadano, T., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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14. Characterization of secretory acid phosphatase gene of lupin roots and the transformation of the gene into tobacco plants

Author

Wasaki, J., Dateki, H., Shinano, T., Osaki, M., Tadano, T., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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48. Intrathecal administration of p-hydroxymercuribenzoate or phosphoramidon/bestatin-combined induces antinociceptive effects through different opioid mechanisms

Author

Tan No, K, Taira, A, Inoue, M, Ohshima, K, Sakurada, T, Sakurada, C, Nylander, Ingrid, Demuth, H-U, Silberring, J, Terenius, L, Tadano, T, Kisara, K, Tan No, K, Taira, A, Inoue, M, Ohshima, K, Sakurada, T, Sakurada, C, Nylander, Ingrid, Demuth, H-U, Silberring, J, Terenius, L, Tadano, T, and Kisara, K

Abstract

The antinociceptive effect of intrathecally (i.t.) administered protease inhibitors was tested against capsaicin (800 ng) injected into the dorsal surface of a hindpaw. Both p-hydroxymercuribenzoate (2-8 nmol), a cysteine protease inhibitor, and phosphoramidon (1-4 nmol), an endopeptidase 24.11 inhibitor in the presence of bestatin (0.25 nmol) an aminopeptidase inhibitor, administered i.t. 60 min prior to the injection of capsaicin produced a dose-dependent reduction of the capsaicin-induced paw licking and biting response. p-Hydroxymercuribenzoate (4 nmol)-induced antinociception was significantly antagonized by nor-binaltorphimine, a selective kappa-opioid receptor antagonist, but not by naltrindole, a selective delta-opioid receptor antagonist. On the other hand, phosphoramidon (4 nmol) /bestatin-induced antinociception was significantly antagonized by naltrindole, but not by nor-binaltorphimine. The results indicate that the antinociceptive effect of p-hydroxymercuribenzoate may be due to the inhibition of a cysteine protease degrading endogenous dynorphins whereas phosphoramidon in the presence of bestatin blocks the degradation of enkephalins.

Published
1998
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