Reconstruction of Low Dimensional Electronic States by Altering the Chemical Arrangement at the SrTiO3 Surface |
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Authors: | 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 |
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Affiliation: | 1. Department of Energy Conversion and Storage, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;2. Departamento de Física, Universidade Federal de Minas Gerais, C. P. 702, Belo Horizonte, MG, 30123–970 Brazil;3. Photon Science Division, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland |
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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. |
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Keywords: | angle-resolved photoemission spectroscopy surface preparations SrTiO3 two-dimensional electron gas |
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