The control of gap width in the low-dimensional systems with charge density waves instability

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The strong photoeffect was discovered experimentally in InSe crystals at temperature 4.2 K as a result of laser radiation action at fixed wavelengths of 337 and 195 micron. Effect was explained with appearance of the gap in the continuum of conduction band. The photoeffect value was found to depend strongly on electric current through the crystal.