Hour: From 15:00h to 16:00h
Place: Seminar Room
SEMINAR: Ultrafast THz Control of Ferroelectric Phase Transitions in SrTiO3
ABSTRACT:
Light-induced manipulation of quantum phases unlocks novel material functionalities. We use terahertz (THz) pulses to drive ferroelectric (FE) transitions in quantum paraelectric SrTiO3, probed by time-resolved second harmonic generation. Our results reveal that the intense THz pulses can induce transient competition between the FE phase and antiferrodistortive modes. At the same time, the polar nanoregions, stabilizing local order, may inhibit the ferroelectricity. These findings demonstrate ultrafast control of quantum phases, advancing ferroelectric device applications.
BIO:
Jingbo Qi is a professor at University of Electronic Science and Technology of China. He got his Ph.D. from Vanderbilt University (USA). He was previously a postdoctoral associate in the National High Magnetic Field Laboratory and Los Alamos National Laboratory, respectively. His main research interest focuses on using the ultrafast optical spectroscopy and terahertz spectroscopy to study the dynamical properties in various condensed matter systems. The related results are published in journals such as Phys. Rev. Lett., Nat. Commun. and so on.
Hour: From 15:00h to 16:00h
Place: Seminar Room
SEMINAR: Ultrafast THz Control of Ferroelectric Phase Transitions in SrTiO3
ABSTRACT:
Light-induced manipulation of quantum phases unlocks novel material functionalities. We use terahertz (THz) pulses to drive ferroelectric (FE) transitions in quantum paraelectric SrTiO3, probed by time-resolved second harmonic generation. Our results reveal that the intense THz pulses can induce transient competition between the FE phase and antiferrodistortive modes. At the same time, the polar nanoregions, stabilizing local order, may inhibit the ferroelectricity. These findings demonstrate ultrafast control of quantum phases, advancing ferroelectric device applications.
BIO:
Jingbo Qi is a professor at University of Electronic Science and Technology of China. He got his Ph.D. from Vanderbilt University (USA). He was previously a postdoctoral associate in the National High Magnetic Field Laboratory and Los Alamos National Laboratory, respectively. His main research interest focuses on using the ultrafast optical spectroscopy and terahertz spectroscopy to study the dynamical properties in various condensed matter systems. The related results are published in journals such as Phys. Rev. Lett., Nat. Commun. and so on.