Difference between far-infrared photoconductivity spectroscopy and absorption spectroscopy: theoretical evidence of the electron reservoir mechanism

Tadashi Toyoda; Maho Fujita; Tomohisa Uchida; Nobuyoshi Hiraiwa; Taturo Fukuda; Hideki Koizumi; Chao Zhang

doi:10.1103/PhysRevLett.111.086801

Difference between far-infrared photoconductivity spectroscopy and absorption spectroscopy: theoretical evidence of the electron reservoir mechanism

Phys Rev Lett. 2013 Aug 23;111(8):086801. doi: 10.1103/PhysRevLett.111.086801. Epub 2013 Aug 20.

Authors

Tadashi Toyoda¹, Maho Fujita, Tomohisa Uchida, Nobuyoshi Hiraiwa, Taturo Fukuda, Hideki Koizumi, Chao Zhang

Affiliation

¹ Department of Physics, Tokai University, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan.

PMID: 24010460
DOI: 10.1103/PhysRevLett.111.086801

Abstract

The intriguing difference between far-infrared photoconductivity spectroscopy and absorption spectroscopy in the measurement of the magnetoplasmon frequency in GaAs quantum wells reported by Holland et al. [Phys. Rev. Lett. 93, 186804 (2004)] remains unexplained to date. This Letter provides a consistent mechanism to solve this puzzle. The mechanism is based on the electron reservoir model for the integer quantum Hall effect in graphene [Phys. Lett. A 376, 616 (2012)]. We predict sharp kinks to appear in the magnetic induction dependence of the magnetoplasmon frequency at very low temperatures such as 14 mK in the same GaAs quantum well sample used by Holland et al.