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We studied the transmittance and reflectance of the low-dimensionalMott-Hubbard insulator TiOCl in the infrared and visible frequency range as afunction of pressure. The strong suppression of the transmittance and theabrupt increase of the near-infrared reflectance above 12 GPa suggest apressure-induced insulator-to-metal transition. The pressure-dependentfrequency shifts of the orbital excitations, as well as the pressuredependences of the charge gap and the spectral weight of the opticalconductivity above the phase transition are presented.Comment: 4 pages, 6 figure

physical review. b, condensed matter and materials physics

Possible pressure-induced insulator-to-metal transition in low-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>TiOCl</mml:mi></mml:mrow></mml:math>

Possible pressure-induced insulator-to-metal transition in low-dimensionalTiOCl