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Anomalous Photoconduction of Low-Temperature Charge-Density Wave in NbS3-II as a Physical Basis of a Method for Detection of Weak Signals
摘要： The effect of IR radiation on photoconduction of two charge-density waves (CDWs) in the monoclinic phase of quasi-1D conductor NbS3 (NbS3-II) is studied. For the CDW-1 that emerges at a temperature of ТР1 = 360 К, threshold field Et increases with irradiation power W. For CDW-2 that emerges at a temperature of TP2 = 150 K, field Et decreases due to IR irradiation, which proves anomalous character of CDW-2 and indicates direct photoactivation of its sliding. Extremely high sensitivity of the measured signal to IR radiation is obtained using stimulation of the CDW coherence by the microwave field.
关键词： NbS3,microwave field,threshold field,photoconduction,charge-density waves,IR radiation
更新于2025-09-09 09:28:46
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Strong coupling of a two-dimensional electron ensemble to a single-mode cavity resonator
摘要： We investigate the regime of strong coupling of an ensemble of two-dimensional electrons to a single-mode cavity resonator. In particular, we realize such a regime of light-matter interaction by coupling the cyclotron motion of a collection of electrons on the surface of liquid helium to the microwave field in a semiconfocal Fabry-Pérot resonator. For the corotating component of the microwave field, the strong coupling is pronouncedly manifested by the normal-mode splitting in the spectrum of coupled field-particle motion. We present a complete description of this phenomenon based on classical electrodynamics, as well as show that the full quantum treatment of this problem results in mean-value equations of motion that are equivalent to our classical result. For the counterrotating component of the microwave field, we observe a strong resonance when the microwave frequency is close to both the cyclotron and cavity frequencies. We show that this surprising effect, which is not expected to occur under the rotating-wave approximation, results from the mixing between two polarization components of the microwave field in our cavity.
关键词： microwave field,classical electrodynamics,cavity resonator,normal-mode splitting,two-dimensional electrons,rotating-wave approximation,Fabry-Pérot resonator,strong coupling,quantum treatment,cyclotron motion
更新于2025-09-04 15:30:14