Dmitry R. Khokhlov

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We suggest a method for detection of highly conductive surface electron states including topological ones. The method is based on measurements of the photoelectromagnetic effect using terahertz laser pulses. In contrast to conventional transport measurements, the method is not sensitive to the bulk conductivity. The method is demonstrated on an example of(More)
We performed a study of a range of (Cd<inf>1&#x2212;x</inf>Zn<inf>x</inf>)<inf>3</inf>As<inf>2</inf> mixed crystals undergoing a transition from the Dirac semimetal phase to trivial semiconductor at variation of the composition x. We show that for the Dirac semimetal phase, the photoelectromagnetic effect amplitude is defined by the number of incident(More)
In this paper, we show that the terahertz photoconductivity and the magnetophotogalvanic effect in Hg<inf>1&#x2212;x</inf>Cd<inf>x</inf>Te films change the sign across the topological transition from the inverted to the trivial electron energy spectrum. Electron energy spectrum modification influenced by magnetic field and topological surface states(More)
Physical principles of operation of the photodetecting devices based on the group III-doped IV-VI semiconductors are presented. We report on the performance of lead telluride-based single direct terahertz detectors. Architecture of a system for passive terahertz vision of room-temperature objects is presented.
We present results of an experimental study concentrated on performance optimization of highly sensitive Pb <inline-formula><tex-math notation="LaTeX">$_{1-x}$</tex-math></inline-formula>Sn<inline-formula> <tex-math notation="LaTeX">$_x$</tex-math></inline-formula>Te(In) terahertz photodetectors perspective for applications in the terahertz astronomy. The(More)
Indium doped lead telluride-based photodetectors have demonstrated extremely high performance in the terahertz range. These materials reveal a number of advantageous features: &#x201C;internal&#x201D; accumulation of the incident radiation, high spatial and temporal stability, high radiation hardness and others
We demonstrate that measurements of the photo-electromagnetic effect using terahertz laser radiation provide an argument for the existence of highly conductive surface electron states with a spin texture in Dirac semimetals (Cd1-x Zn x )3As2. We performed a study on a range of (Cd1-x Zn x )3As2 mixed crystals undergoing a transition from the Dirac semimetal(More)
We report on unusual photoconductivity under the action of strong terahertz laser pulses in PbTe(Ga). The character and even the sign on the photoconductivity depends on the level of photoexcitation: it 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(More)
We suggest a method for detection of highly conductive surface electron states including topological ones. The method is based on measurements of the photoelectromagnetic effect using terahertz laser pulses. In contrast to conventional transport measurements, the method is not sensitive to the bulk conductivity. The method is demonstrated on an example of(More)