Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
78 0 |
SM ISO690:2012 EGOROVA, Svetlana, CHERNICHKIN, Vladimir, RYABOVA, Ludmila, DANILOV, Sergey, NIKORICH, Andrey V., KHOKHLOV, Dmitri. Probing of local electron states by laser terahertz radiation in PbTe(Ga). In: Journal of Alloys and Compounds, 2014, vol. 615, pp. 375-377. ISSN 0925-8388. DOI: https://doi.org/10.1016/j.jallcom.2014.06.066 |
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Journal of Alloys and Compounds | ||||||
Volumul 615 / 2014 / ISSN 0925-8388 | ||||||
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DOI:https://doi.org/10.1016/j.jallcom.2014.06.066 | ||||||
Pag. 375-377 | ||||||
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Rezumat | ||||||
We report on unusual photoconductivity under the action of strong terahertz laser pulses in PbTe(Ga) single crystals at low temperatures. The character and even the sign on the photosignal depends on the level of photoexcitation: the photoconductivity is positive and persistent at high degrees of excitation, whereas it is negative and non-persistent at low levels of excitation. We show that this non-trivial photoelectric behaviour is due to formation of local electron states in the close vicinity of the quasi-Fermi level. These local states may be formed only when the quasi-Fermi level lies on the background of an allowed energy band with a relatively high density of states. |
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Cuvinte-cheie Gallium-doped lead telluride, Local electron states, Terahertz photoconductivity |
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