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Resolving the Valence of Iron Oxides by Resonant Photoemission Spectroscopy
Hao Chen, Yun Liu, Hexin Zhang +4
Precisely determining the oxidation states of metal cations within variable-valence transition metal oxides remains a significant challenge, yet it is crucial for understanding and…
Direct observation of phase change accommodating hydrogen uptake in bimetallic nanoparticles
Lívia P. Matte, Maximilian Jaugstetter, Alisson S. Thill +6
Hydrogen holds great promise as a cleaner alternative to fossil fuels, but its efficient and affordable storage remains a significant challenge. Bimetallic systems, such as Pd-Ni,…
Elucidating the active phases of CoOx films on Au(111) in the CO Oxidation Reaction
Hao Chen, Lorenz J. Falling, Heath Kersell +10
Using CoOx thin films supported on Au(111) single crystal surfaces as model catalysts for the CO oxidation reaction we show that three reaction regimes exist in response to chemica…
Emergent phenomena at oxide interfaces studied with standing-wave photoelectron spectroscopy
C. -T. Kuo, G. Conti, J. E. Rault +3
Emergent phenomena at complex-oxide interfaces have become a vibrant field of study in the past two decades due to the rich physics and a wide range of possibilities for creating n…
High resolution depth profiling using near-total-reflection hard X-ray photoelectron spectroscopy
Julien E. Rault, Cheng-Tai Kuo, Henrique P. Martins +2
By adjusting the incidence angle of incoming X-ray near the critical angle of X-ray total reflection, the photoelectron intensity is strongly modulated due to the variation of X-ra…
Layer-Resolved Many-Electron Interactions in Delafossite PdCoO2 from Standing-Wave Photoemission Spectroscopy
Qiyang Lu, Henrique Martins, J. Matthias Kahk +7
When a three-dimensional material is constructed by stacking different two-dimensional layers into an ordered structure, new and unique physical properties can emerge. An example i…
Hard x-ray standing-wave photoemission study of the interfaces in a BiFeO/LaSrMnO superlattice
H. P. Martins, S. A. Khan, G. Conti +12
Hybrid multiferroics such as BiFeO (BFO) and LaSrMnO (LSMO) heterostructures are highly interesting functional systems due to their complex electronic and m…
Electrostatic potential mapping at ferroelectric domain walls by low-temperature photoemission electron microscopy
J. Schaab, K. Shapovalov, P. Schoenherr +10
Low-temperature X-ray photoemission electron microscopy (X-PEEM) is used to measure the electric potential at domain walls in improper ferroelectric Er0.99Ca0.01MnO3. By combining…
Two-dimensional electron systems in perovskite oxide heterostructures: Role of the polarity-induced substitutional defects
Shih-Chieh Lin, Cheng-Tai Kuo, Yu-Cheng Shao +17
The discovery of a two-dimensional electron system (2DES) at the interfaces of perovskite oxides such as LaAlO3 and SrTiO3 has motivated enormous efforts in engineering interfacial…
Hard x-ray standing-wave photoemission insights into the structure of an epitaxial Fe/MgO multilayer magnetic tunnel junction
C. S. Conlon, G. Conti, S. Nemšák +15
The Fe/MgO magnetic tunnel junction is a classic spintronic system, with current importance technologically, and interest for future innovation. The key magnetic properties are lin…
Probing single unit-cell resolved electronic structure modulations in oxide superlattices with standing-wave photoemission
W. Yang, R. U. Chandrasena, M. Gu +9
Control of structural couplings at the complex-oxide interfaces is a powerful platform for creating new ultrathin layers with electronic and magnetic properties unattainable in the…
In aqua electrochemistry probed by XPEEM: experimental setup, examples, and challenges
Slavomír Nemšák, Evgheni Strelcov, Hongxuan Guo +8
Recent developments in environmental and liquid cells equipped with electron transparent graphene windows have enabled traditional surface science spectromicroscopy tools, such as…
Interface properties and built-in potential profile of a LaCrO/SrTiO superlattice determined by standing-wave excited photoemission spectroscopy
Shih-Chieh Lin, Cheng-Tai Kuo, Ryan B. Comes +14
LaCrO (LCO) / SrTiO (STO) heterojunctions are intriguing due to a polar discontinuity along (001), two distinct and controllable interface structures [(LaO)/(TiO)$^…
Electronic structure of negative charge transfer CaFeO3 across the metal-insulator transition
Paul C. Rogge, Ravini U. Chandrasena, Antonio Cammarata +12
We investigated the metal-insulator transition for epitaxial thin films of the perovskite CaFeO3, a material with a significant oxygen ligand hole contribution to its electronic st…
Element- and momentum-resolved electronic structure of the dilute magnetic semiconductor manganese doped gallium arsenide
Slavomír Nemšák, Mathias Gehlmann, Cheng-Tai Kuo +10
The dilute magnetic semiconductors have promise in spin-based electronics applications due to their potential for ferromagnetic order at room temperature, and various unique switch…
Depth profiling charge accumulation from a ferroelectric into a doped Mott insulator
M. Marinova, J. E. Rault, A. Gloter +13
The electric field control of functional properties is a crucial goal in oxide-based electronics. Non-volatile switching between different resistivity or magnetic states in an oxid…
Direct observation of the band gap transition in atomically thin ReS
Mathias Gehlmann, Irene Aguilera, Gustav Bihlmayer +13
ReS is considered as a promising candidate for novel electronic and sensor applications. The low crystal symmetry of the van der Waals compound ReS leads to a highly anisot…
Accurate determination of the valence band edge in hard x-ray photoemission spectra using GW theory
Johannes Lischner, Slavomir Nemsak, Giuseppina Conti +6
We introduce a new method for determining accurate values of the valence-band maximum in x-ray photoemission spectra. Specifically, we align the sharpest peak in the valence-band r…
Energetic, spatial and momentum character of a buried interface: the two-dimensional electron gas between two metal oxides
S. Nemšák, G. Conti, A. X. Gray +32
The interfaces between two condensed phases often exhibit emergent physical properties that can lead to new physics and novel device applications, and are the subject of intense st…
Satellite Band Structure in Silicon Caused by Electron-Plasmon Coupling
Johannes Lischner, G. K. Palsson, Derek Vigil-Fowler +5
We report the first angle-resolved photoemission measurement of the wave-vector dependent plasmon satellite structure of a three-dimensional solid, crystalline silicon. In sharp co…
Functional Materials for Information and Energy Technology: Insights by Photoelectron Spectroscopy
Martina Müller, Slavomir Nemsak, Lukasz Plucinski +1
The evolution of both information and energy technology is intimately connected to complex condensed matter systems, the properties of which are determined by electronic and chemic…