Phys. Rev. Lett. 105, 203003 (2010) [4 pages]Ladder Climbing on the Anharmonic Intermolecular Potential in an Amino Acid Microcrystal via an Intense Monocycle Terahertz PulseReceived 1 June 2010; published 11 November 2010 We experimentally demonstrated 20 ladder climbing steps on the anharmonic intermolecular potential in the amino-acid microcrystals with an intense monocycle terahertz pulse. Absorption spectra show the suppression of the peak and enhancement of the low-frequency absorption for the incident electric field amplitude. These results are reproduced by simulations based on coherent transition processes between quantum levels in the anharmonic potential. The appearance of such nonlinearity allows us to control macroscopic motion via a phase-controlled terahertz pulse. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.203003
DOI:
10.1103/PhysRevLett.105.203003
PACS:
33.20.Xx, 33.20.Ea, 78.47.jh
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