Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures with hard x-ray photoelectron spectroscopy.

@article{Sing2009ProfilingTI,
  title={Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures with hard x-ray photoelectron spectroscopy.},
  author={Michael Sing and G. Berner and Karin Goss and Astrid M. M{\"u}ller and A. Ruff and Andreas Wetscherek and S. Thiel and J. Mannhart and S. A. Pauli and Christof W. Schneider and Philip R. Willmott and Mihaela Gorgoi and Franz Sch{\"a}fers and Ralph Claessen},
  journal={Physical review letters},
  year={2009},
  volume={102 17},
  pages={
          176805
        }
}
The conducting interface of LaAlO3/SrTiO3 heterostructures has been studied by hard x-ray photoelectron spectroscopy. From the Ti 2p signal and its angle dependence we derive that the thickness of the electron gas is much smaller than the probing depth of 4 nm and that the carrier densities vary with increasing number of LaAlO3 overlayers. Our results point to an electronic reconstruction in the LaAlO3 overlayer as the driving mechanism for the conducting interface and corroborate the recent… 

Figures and Tables from this paper

Distribution of electronic reconstruction at the n-type LaAlO3/SrTiO3 interface revealed by hard x-ray photoemission spectroscopy
We investigated the electronic reconstruction at the n-type LaAlO3/SrTiO3 interface with hard x-ray photoelectron spectroscopy (HAXPES) under grazing incidence. By exploiting the collapse of
Spectroscopic evidence of in-gap states at the SrTiO3/LaAlO3 ultrathin interfaces
Experimental evidence of differences in the electronic properties of an insulating and a conducting SrTiO3/LaAlO3 interface is provided by soft x-ray spectroscopies. While core level photoemission
Probing Perovskite Interfaces and Superlattices with X-ray Photoemission Spectroscopy
The use of X-ray photoemission spectroscopy (XPS) in the soft, intermediate and hard X-ray regimes in probing complex oxide interfaces and superlattices is reviewed. Core-level line shapes are
Emergence of quasi-two-dimensional electron gas at the interface of LaAlO3/Sr2AlNbO6(001) heterostructures
Quasi-two-dimensional electron gas (q-2DEG) at the interface of oxide heterostructures, as an alternative to semiconductor electronics, is limited by its low carrier mobility. This is largely due to
Highly conductive two-dimensional electron gas at the interface of Al2O3/SrTiO3
We create a two-dimensional electron gas at the Al2O3/SrTiO3/LaAlO3 heterostructures using pulsed laser deposition, which exhibits a decreasing sheet resistance with increasing growth temperatures of
Two-Dimensional Electron Gas at the N-type Interface of the LaAlO3/SrTiO3 Hetero-Structure: A First Principle Study
We examine the formation of the two-dimensional electron gas (2-DEG) at the n-type interface of two band insulators LaAlO3 (LAO) and SrTiO3 (STO) by increasing the thickness of the LAO layers in the
Electronic reconstruction at n-type SrTiO3/LaAlO3 interfaces
Electron-energy-loss spectroscopy (EELS) is used to investigate single layers of LaAlO3 grown on SrTiO3 having an n-type interface as well as multilayers of LaAlO3 and SrTiO3 in which both n- and
Electronic structure of delta-doped La:SrTiO3 layers by hard x-ray photoelectron spectroscopy
We have employed hard x-ray photoemission (HAXPES) to study a delta-doped SrTiO3 layer that consisted of a 3-nm thickness of La-doped SrTiO3 with 6% La embedded in a SrTiO3 film. Results are compared
Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface.
TLDR
The vertical concentration profile has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm and is suggestive of polaronic correlations.
...
1
2
3
4
5
...

References

SHOWING 1-6 OF 6 REFERENCES
"J."
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
Phys
  • Rev. Lett. 17, 1133 (1966). PRL 102, 176805
  • 2009
Phys
  • Rev. B 74, 035112
  • 2006
Nature (London) 427
  • 423
  • 2004
Nature 427
  • 423
  • 2004
Condens
  • Matter 12, R367
  • 2000