Volume 118, Number 6, June 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 September 2017|
Strong enhancement of third-harmonic generation in a double layer graphene system caused by electron-hole pairing
1 Institute for Single Crystals, National Academy of Sciences of Ukraine - Nauki ave. 60, Kharkov 61001, Ukraine
2 V. N. Karazin Kharkov National University - Svobody Sq. 4, Kharkov 61022, Ukraine
Received: 22 May 2017
Accepted: 4 August 2017
A manifestation of electron-hole pairing in nonlinear electromagnetic response of a double layer graphene system is studied. It is shown that the pairing causes the appearance of a number of peaks in the frequency dependence of the intensity of the third-harmonic generation (THG). The highest peak corresponds to , where ω is the incident wave frequency, and Δ is the order parameter of the electron-hole pairing. The absolute value of the THG intensity in the systems with electron-hole pairing is of several orders of magnitude greater than the THG intensity in the unpaired state. It is shown that huge enhancement of the THG intensity occurs both in the double monolayer and double bilayer graphene systems.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation / 74.78.-w – Superconducting films and low-dimensional structures
© EPLA, 2017
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