Projects per year
Abstract
Many-body interactions in transition-metal oxides give rise to a wide range of functional properties, such as high-temperature superconductivity(1), colossal magnetoresistance(2) or multiferroicity(3). The seminal recent discovery of a two-dimensional electron gas (2DEG) at the interface of the insulating oxides LaAlO3 and SrTiO3 (ref. 4) represents an important milestone towards exploiting such properties in all-oxide devices(5). This conducting interface shows a number of appealing properties, including a high electron mobility(4,6), superconductivity(7) and large magnetoresistance(8), and can be patterned on the few-nanometre length scale. However, the microscopic origin of the interface 2DEG is poorly understood. Here, we show that a similar 2DEG, with an electron density as large as 8 x 10(13) cm(-2), can be formed at the bare SrTiO3 surface. Furthermore, we find that the 2DEG density can be controlled through exposure of the surface to intense ultraviolet light. Subsequent angle-resolved photoemission spectroscopy measurements reveal an unusual coexistence of a light quasiparticle mass and signatures of strong many-body interactions.
Original language | English |
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Pages (from-to) | 114-118 |
Number of pages | 5 |
Journal | Nature Materials |
Volume | 10 |
Issue number | 2 |
DOIs | |
Publication status | Published - Feb 2011 |
Keywords
- INTERFACES
- OXIDES
- STATE
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Dive into the research topics of 'Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface'. Together they form a unique fingerprint.Projects
- 3 Finished
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Laser-ARPES: Laser based photoelectron spectroscopy for a closer look at correlated electrons
Baumberger, F. (PI)
1/08/08 → 31/07/13
Project: Standard
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EP/F006640/1 Probing the Quantum: Probing the quantum many-body states of low-dimensional metals by angular resolved photoelectron spectroscopy
Baumberger, F. (PI)
10/03/08 → 9/03/11
Project: Standard
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SFC SRDG Centre SCISS: INTERDISCIPLINARY SCOTTISH CENTRE FOR SURFACE SPECTROSCOPY
Baumberger, F. (PI), Mackenzie, A. (CoI), Richardson, N. V. (CoI) & Schaub, R. (CoI)
1/06/07 → 31/05/11
Project: Standard