Publications (18)
Surface enhanced covalency and Madelung potentials in Nb doped SrTiO (100), (110) and (111) single crystals
G. M. Vanacore, L. F. Zagonel, N. Barrett
The influence of surface enhanced covalency on the Madelung potential is experimentally investigated using angle-resolved photoemission for (100), (110) and (111) SrTiO surface…
Interface Electronic Structure in a Metal/Ferroelectric Heterostructure under Applied Bias
J. E. Rault, G. Agnus, T. Maroutian +8
The effective barrier height between an electrode and a ferroelectric (FE) depends on both macroscopic electrical properties and microscopic chemical and electronic structure. The…
Control of surface potential at polar domain walls in a nonpolar oxide
G. F. Nataf, M. Guennou, J. Kreisel +8
Ferroic domain walls could play an important role in microelectronics, given their nanometric size and often distinct functional properties. Until now, devices and device concepts…
Thickness-dependent polarization of strained BiFeO3 films with constant tetragonality
J. E. Rault, W. Ren, S. Prosandeev +7
We measure the remnant polarization of ferroelectric domains in BiFeO3 films down to 3.6 nm using low energy electron and photoelectron emission microscopy. The measured polarizati…
Microscopic correlation between chemical and electronic states in epitaxial graphene on SiC(000-1)
C. Mathieu, N. Barrett, J. Rault +6
We present energy filtered electron emission spectromicroscopy with spatial and wave-vector resolution on few layer epitaxial graphene on SiC$(000-1) grown by furnace annealing. Lo…
Charge spill-out and work function of few-layer graphene on SiC(0001)
O. Renault, A. M. Pascon, H. Rotella +7
We report on the charge spill-out and work function of epitaxial few-layer graphene on 6H-SiC(0001). Experiments from high-resolution, energy-filtered X-ray photoelectron emission…
Skin layer of BiFeO3 single crystals
X. Marti, P. Ferrer, J. Herrero-Albillos +5
A surface layer ("skin") that is functionally and structurally different from the bulk was found in single crystals of BiFeO3. Impedance analysis indicates that a previously report…
Hydrostatic strain enhancement in laterally confined SiGe nanostripes
G. M. Vanacore, M. Chaigneau, N. Barrett +16
Strain-engineering in SiGe nanostructures is fundamental for the design of optoelectronic devices at the nanoscale. Here we explore a new strategy, where SiGe structures are latera…
Three-dimensional band structure of layered TiTe2: Photoemission final-state effects
V. N. Strocov, E. E. Krasovskii, W. Schattke +4
Three-dimensional band structure of unoccupied and occupied states of the prototype layered material TiTe2 is determined focusing on the GammaA line of the Brillouin zone. Dispersi…
Exploring interlayer Dirac cone coupling in commensurately rotated few-layer graphene on SiC(000-1)
C. Mathieu, E. H. Conrad, F. Wang +5
We investigate electronic band-structure images in reciprocal space of few layer graphene epitaxially grown on SiC(000-1). In addition to the observation of commensurate rotation a…
Full field chemical imaging of buried native sub-oxide layers on doped silicon patterns
F. de la Peña, N. Barrett, L. F. Zagonel +2
Fully energy-filtered X-ray photoelectron emission microscopy is used to analyze the spatial distribution of the silicon sub-oxide structure at the SiO2/Si interface as a function…
Band Mapping in One-Step Photoemission Theory: Multi-Bloch-Wave Structure of Final States and Interference Effects
E. E. Krasovskii, V. N. Strocov, N. Barrett +3
A novel Bloch-waves based one-step theory of photoemission is developed within the augmented plane wave formalism. Implications of multi-Bloch-wave structure of photoelectron final…
Ferroelastic twin angles at the surface of CaTiO quantified by PhotoEmission Electron Microscopy
G. Magagnin, C. Lubin, M. Escher +3
We use photoemission electron microscopy to measure the ferroelastic twin wall angles at the surface of CaTiO(001) and deduce the strain ordering. We analyze the angul…
Full field electron spectromicroscopy applied to ferroelectric materials
N. Barrett, J. E. Rault, J. L. Wang +15
The application of PhotoEmission Electron Microscopy (PEEM) and Low Energy Electron Microscopy (LEEM) techniques to the study of the electronic and chemical structure of ferroelect…
Polarization sensitive surface band structure of doped BaTiO3(001)
J. E. Rault, J. Dionot, C. Mathieu +4
We present a spatial and wave-vector resolved study of the electronic structure of micron sized ferroelectric domains at the surface of a BaTiO3(001) single crystal. The n-type dop…
Enhancement of photovoltaic efficiency by insertion of a polyoxometalate layer at the anode of an organic solar cell
M. Alaaeddine, Q. Zhu, D. Fichou +5
In this article the Wells-Dawson polyoxometalate K6[P2W18O62] is grown as an interfacial layer between indium tin oxide and bulk heterojunction of poly(3-hexylthiophene) (P3HT) and…
Influence of the ferroelectric polarization on the electronic structure of BaTiO3 thin films
N. Barrett, J. Rault, I. Krug +5
Micrometric domains of precise ferroelectric polarization have been written into a 20 nm thick epitaxial thin film of BaTiO3(001) (BTO) on a Nb doped SrTiO3 (STO) substrate using P…
Time-resolved PhotoEmission Spectroscopy on a Metal/Ferroelectric Heterostructure
J. E. Rault, G. Agnus, T. Maroutian +8
In thin film ferroelectric capacitor the chemical and electronic structure of the electrode/FE interface can play a crucial role in determining the kinetics of polarization switchi…