Science Daily December 2, 2019
So far moderately large changes in the exitons control parameters — temperature, pressure, electric and magnetic fields that can tune excitonic properties have only been achieved under equilibrium conditions and at low temperatures. An international team of researchers (Switzerland, Spain, Germany, USA- Simons Foundation Flatiron Institute, France) has demonstrated the control of excitonic properties using acoustic waves in titanium dioxide at room temperature. To do this, the researchers launched a high-frequency (hundreds of gigahertz), large-amplitude acoustic wave in the material using ultrashort laser pulses. This strategy allows for the dynamical manipulation of the exciton properties at high speed. The research paves a new era for acousto-excitonics and active-excitonics, analogous to active plasmonics, which exploits the plasmon excitations of metals…read more. Open Access TECHNICAL ARTICLE