Reconstruction of Low Dimensional Electronic States by Altering the Chemical Arrangement at the SrTiO3 Surface

Hang Li*, Walber H. Brito, Eduardo B. Guedes, Alla Chikina, Rasmus T. Dahm, Dennis V. Christensen, Shinhee Yun, Francesco M. Chiabrera, Nicholas C. Plumb, Ming Shi, Nini Pryds, Milan Radovic*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Developing reliable methods for modulating the electronic structure of the 2D electron gas (2DEG) in SrTiO3 is crucial for utilizing its full potential and inducing novel properties. Herein, it is shown that relatively simple surface preparation reconstructs the 2DEG at the SrTiO3 (STO) surface, leading to a Lifshitz-like transition. Combining experimental methods, such as angle-resolved photoemission spectroscopy (ARPES) and X-ray photoemission spectroscopy with ab initio calculations, that the modulation of the surface band structures can be effectively achieved via transforming the chemical composition at the atomic scale is found. In addition, ARPES experiments demonstrate that vacuum ultraviolet light can be efficiently employed to alter the band renormalization of the 2DEG system and control the electron-phonon interaction . This study provides a robust and straightforward route to stabilize and tune the low-dimensional electronic structure via the chemical degeneracy of the STO surface.
Original languageEnglish
Article number2210526
JournalAdvanced Functional Materials
Volume33
Issue number19
Number of pages8
ISSN1616-301X
DOIs
Publication statusPublished - 2023

Keywords

  • Angle-resolved photoemission spectroscopy
  • Surface preparations
  • SrTiO3
  • Two-dimensional electron gas

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