Evidence of radiation-driven Landau states in 2D electron systems: magnetoresistance oscillations phase shift Articles uri icon

published in

  • EPL  Journal

publication date

  • March 2016

start page

  • 1

end page

  • 5

issue

  • 5 (57004)

volume

  • 113

International Standard Serial Number (ISSN)

  • 0295-5075

Electronic International Standard Serial Number (EISSN)

  • 1286-4854

abstract

  • We provide the ultimate explanation of one of the core features of microwave-induced magnetoresistance oscillations in high-mobility two-dimensional electron systems: the 1/4-cycle phase shift of minima. We start with the radiation-driven electron orbits model with the novel concept of scattering flight-time between Landau states. We calculate the extrema and nodes positions obtaining an exact coincidence with the experimental ones. The main finding is that the physical origin of the phase shift is a delay of pi/2 of the radiation-driven Landau guiding center with respect to radiation, demonstrating the oscillating nature of the irradiated Landau states. We analyze the dependence of this minima on radiation frequency and power and its possible shift with the quality of the sample. Copyright (C) EPLA, 2016

keywords

  • zero-resistance states; electromagnetic-wave excitation; gaas/algaas heterostructures; magnetic-field; photoexcitation