Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation

Seth B. Todd, Drew B. Riley, Ali Binai-Motlagh, Charlotte Clegg, Ajan Ramachandran, Samuel A. March, Justin M. Hoffman, Ian G. Hill, Constantinos C. Stoumpos, Mercouri G Kanatzidis, Zhi Gang Yu, Kimberley C. Hall

Research output: Contribution to journalArticle

Abstract

The strong spin-orbit interaction in the organic-inorganic perovskites tied to the incorporation of heavy elements (e.g., Pb and I) makes these materials interesting for applications in spintronics. In conjunction with a lack of inversion symmetry associated with distortions of the metal-halide octahedra, surfaces and interfaces, or the application of a bias, the Rashba effect (used in spin field-effect transistors and spin filters) has been predicted to be much larger in these materials than in traditional III-V semiconductors such as GaAs. Evidence of strong Rashba coupling has been observed in both 3D (bulk) and 2D perovskites, with the relative role of bulk and surface Rashba contributions in the former case under active debate. The varying size of the reported spin splittings points to the need for more experimental studies of Rashba effects in the organic-inorganic perovskite family of materials. Here, we apply time-resolved circular dichroism techniques to the study of carrier spin dynamics in a 2D perovskite thin film [(BA)2MAPb2I7; BA = CH3(CH2)3NH3, MA = CH3NH3]. Our findings confirm the presence of a Rashba spin splitting via the dominance of precessional spin relaxation induced by the Rashba effective magnetic field (also known as D'yakonov Perel spin relaxation). The size of the Rashba spin splitting in our system was extracted from simulations of the measured spin dynamics incorporating LO-phonon and electron-electron scattering, yielding a value of 10 meV at an electron energy of 50 meV above the band gap, representing a 20 times larger value than in GaAs quantum wells.

Original languageEnglish
Article number081116
JournalAPL Materials
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 1 2019

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Semiconducting gallium
Semiconducting gallium arsenide
Metal halides
Electron scattering
Gallium arsenide
Dichroism
Field effect transistors
Chemical elements
Perovskite
Spin dynamics
Energy gap
Magnetoelectronics
Electrons
Semiconductor quantum wells
Orbits
Magnetic fields
Thin films
Perovskite solar cells
III-V semiconductors
gallium arsenide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Todd, S. B., Riley, D. B., Binai-Motlagh, A., Clegg, C., Ramachandran, A., March, S. A., ... Hall, K. C. (2019). Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation. APL Materials, 7(8), [081116]. https://doi.org/10.1063/1.5099352

Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation. / Todd, Seth B.; Riley, Drew B.; Binai-Motlagh, Ali; Clegg, Charlotte; Ramachandran, Ajan; March, Samuel A.; Hoffman, Justin M.; Hill, Ian G.; Stoumpos, Constantinos C.; Kanatzidis, Mercouri G; Yu, Zhi Gang; Hall, Kimberley C.

In: APL Materials, Vol. 7, No. 8, 081116, 01.08.2019.

Research output: Contribution to journalArticle

Todd, SB, Riley, DB, Binai-Motlagh, A, Clegg, C, Ramachandran, A, March, SA, Hoffman, JM, Hill, IG, Stoumpos, CC, Kanatzidis, MG, Yu, ZG & Hall, KC 2019, 'Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation', APL Materials, vol. 7, no. 8, 081116. https://doi.org/10.1063/1.5099352
Todd SB, Riley DB, Binai-Motlagh A, Clegg C, Ramachandran A, March SA et al. Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation. APL Materials. 2019 Aug 1;7(8). 081116. https://doi.org/10.1063/1.5099352
Todd, Seth B. ; Riley, Drew B. ; Binai-Motlagh, Ali ; Clegg, Charlotte ; Ramachandran, Ajan ; March, Samuel A. ; Hoffman, Justin M. ; Hill, Ian G. ; Stoumpos, Constantinos C. ; Kanatzidis, Mercouri G ; Yu, Zhi Gang ; Hall, Kimberley C. / Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation. In: APL Materials. 2019 ; Vol. 7, No. 8.
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