Terahertz radiation by ultrafast spontaneous polarization modulation in multiferroic BiFeO$_3$ thin films

Details Terahertz radiation by ultrafast spontaneous polarization modulation in multiferroic BiFeO$_3$ thin films Terahertz radiation by ultrafast spontaneous polarization modulation in multiferroic BiFeO$_3$ thin films

2005-10-06

arxiv.org/abs/cond-mat/0510132v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.117402

Terahertz (THz) radiation has been observed from multiferroic BiFeO$_3$ thin films via ultrafast modulation of spontaneous polarization upon carrier excitation with illumination of femtosecond laser pulses. The radiated THz pulses from BiFeO$_3$ thin films were clarified to directly reflect the spontaneous polarization state, giving rise to a memory effect in a unique style and enabling THz radiation even at zero-bias electric field. On the basis of our findings, we demonstrate potential approaches to ferroelectric nonvolatile random access memory with nondestructive readability and ferroelectric domain imaging microscopy using THz radiation as a sensitive probe.

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