Terahertz probing of local electron states in Pb1-xSnxTe(In)

2nd Russia-Japan-USA Symposium on the Fundamental and Applied Problems of Terahertz Devices and Technologies

Chernichkin, Vladimir^1 ; Ryabova, Ludmila^1 ; Nicorici, Andrey^2 ; Danilov, Sergey^3 ; Khokhlov, Dmitry^1

M. V. Lomonosov Moscow State University, Russia^1

Institute of Applied Physics, Kishinev, Moldova^2

University of Regensburg, Germany^3

关键词: Energy position;    Energy spectra;    Lead tin tellurides;    Local electron state;    Optically pumped;    Quasi-Fermi level;    Specific location;    Terahertz lasers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/486/1/012015/pdf
DOI  :  10.1088/1742-6596/486/1/012015

来源: IOP

【 摘 要 】

A new type of semiconductor local states is revealed in lead-tin telluride solid solutions doped with indium. The energy position of these states is not linked to any specific location in the semiconductor energy spectrum, but follows the quasiFermi level position, which may be tuned by photoexcitation. The binding energy of these states is less than 10 meV providing appearance of photoresponse at wavelengths exceeding 100 μm. This conclusion is based on the results of experiments that use illumination of the samples by 100 ns-long pulses of an optically pumped NH3terahertz laser with the wavelengths of 90, 148 and 280 μm corresponding to the quanta energies of 13.8, 8.4 and 4.4 meV, respectively.