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Modulation of a semicondutor-to-semimetal transition at 7 THz via coherent lattice vibrations

1993; American Institute of Physics; Volume: 62; Issue: 16 Linguagem: Inglês

10.1063/1.109537

1520-8842

T. K. Cheng, L. H. Acioli, J. Vidal, H. J. Zeiger, G. Dresselhaus, M. S. Dresselhaus, Erich P. Ippen,

Mechanical and Optical Resonators

This letter introduces the general notion of significantly modulating the physical characteristics of a solid on a terahertz time scale with coherent lattice vibrations. We show, as an example, experiments in which coherent phonons are optically excited in single-crystal Ti2O3, which is a narrow-gap semiconductor at 300 K and gradually transforms into a semimetal at 600 K. Quantitative comparison of previous equilibrium measurements to our new transient measurements suggests that the induced coherent lattice vibration is significantly modulating the semiconductor-to-semimetal transition at 7 THz.