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Circular Photogalvanic Spectroscopy of the Giant Rashba Splitting in 2D Hybrid Organic-Inorganic Perovskites

Jan. 16, 2020

Measurements of the Rashba splitting is an essential component of controlling Rashba splitting.

Scientific Achievement

We have confirmed and diagnosed the giant Rashba splitting in the band structure of 2D hybrid organic-inorganic perovskites (HOIP) using the circular photogalvanic effect (CPGE) spectroscopy.

Significance and Impact

The occurrence of Rashba splitting in the continuum bands has profound influence on the photocarriers dynamics, spintronics, and optical properties of these HOIP compounds.

Research Details

  • Using the action spectrum of the CPGE, we have obtained the Rashba splitting energy to be ~ 40 meV
  • We have also discovered the existence of spin photogalvanic effect associated with the excitons in these HOIP compounds

DOI: 10.1038/s41467-019-14073-6

Related People

Zeev Valy Vardeny
University of Utah

Schematic showing CB (J=1/2) and VB (S=1/2)Chart showing Angle of plate on the x-axis and Current on the y-axis

Schematic of the CPGE spectroscopy and the photogalvanic current in 2D HOIP vs the polarization degree of excitation light