Vibrational resonance in narrow-band conductors

TL;DR

This paper investigates how high-frequency fields induce vibrational resonance and phase transitions in narrow-band bcc lattice conductors, revealing non-monotonous amplification of low-frequency signals and bistability effects.

Contribution

It demonstrates the occurrence of vibrational resonance and nonequilibrium phase transitions in narrow-band conductors under combined low- and high-frequency electric fields.

Findings

Amplification of low-frequency signals via vibrational resonance.

Non-monotonous dependence of gain on high-frequency field amplitude.

High-frequency field induces nonequilibrium phase transition.

Abstract

The response is studied of a narrow-band conductor with bcc lattice to a low-frequency signal under presence of a high-frequency signal. In a high enough dc electric field Ex, the conduction electrons form a bistable system, which results in spontaneous appearance of a transverse electric field Ey. Ac field along y axis leads to amplification of the low-frequency signal with non-monotonous dependence of the gain on the high-frequency field amplitude, so that vibrational resonance takes place. Besides, high-frequency field induced nonequilibrium phase transition is found.