A5102870373- 2D Materials and Applications
- Graphene research and applications
- Topological Materials and Phenomena
- Iron-based superconductors research
- Magnetic Properties and Synthesis of Ferrites
- Magnetic properties of thin films
- Perovskite Materials and Applications
- Organic and Molecular Conductors Research
- Effects of Vibration on Health
- MXene and MAX Phase Materials
- Machine Learning in Materials Science
- Diamond and Carbon-based Materials Research
- Solid-state spectroscopy and crystallography
- Iron oxide chemistry and applications
- Advanced Thermoelectric Materials and Devices
- Quantum and electron transport phenomena
- Rare-earth and actinide compounds
- Ergonomics and Musculoskeletal Disorders
- Textile materials and evaluations
- Magnetic Properties and Applications
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Electronic and Structural Properties of Oxides
- Advanced Semiconductor Detectors and Materials
Brookhaven National Laboratory
2021-2023
University of Connecticut
2015-2018
Bursa Technical University
2018
Bursa Uludağ Üni̇versi̇tesi̇
2018
London Rebuilding Society
2018
Institute for Literature
2018
A systematic investigation of the thickness and oxygen pressure dependence for structural properties ultra-thin epitaxial magnetite (Fe3O4) films has been carried out; such films, generally differ from those bulk when ⩽10 nm. Iron oxide with thicknesses varying 3 nm to 20 were grown on MgO (0 0 1) substrates using molecular beam epitaxy under different pressures ranging 1 × 10(-7) torr 10(-5) torr. The crystallographic electronic structures characterized low energy electron diffraction...
Angle-resolved photoemission spectroscopy experiments reveal a surprisingly richer surface electronic structure in $1T\text{\ensuremath{-}}{\mathrm{VSe}}_{2}$ than previously predicted or probed. Earlier claims supporting charge density wave phase this material are reexamined terms of these findings and found to be untenable. The Fermi is gapless, while band warping effects, currently attributed three-dimensional lattice distortion, result from the simultaneous dispersion closely lying...
Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and their tunability towards device applications. The isostructural Fe$_3$GeTe$_2$ Fe$_3$GaTe$_2$ are two members the Fe-based van der Waals (vdW) ferromagnet family, but exhibit very different Curie temperatures (T$_C$) 210 K 360 K, respectively. Here, by using angle-resolved photoemission spectroscopy density functional theory, we systematically compare...
High-resolution angle-resolved photoemission experiments reveal subtle modifications of the surface electronic structure VSe2. Most remarkably, we show that superconductivity can be induced in VSe2 by right selection substrate and growth parameters. Evidence for superconducting state comes from simultaneous detection spectral kink, quasiparticle peak, Fermi gap, their evolution with temperature. The observation Bogoliubov-like back-bending bands at low temperatures, signaling electron-hole...
Samarium hexaboride is a candidate for the topological Kondo insulator state, in which coherence predicted to give rise an insulating gap spanned by surface states. Here we investigate and bulk electronic properties of magnetically alloyed ${\mathrm{Sm}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{B}}_{6}$ ($M=\mathrm{Ce}$, Eu), using angle-resolved photoemission spectroscopy complementary characterization techniques. Remarkably, topologically nontrivial band structures are found persist highly...
Recent progress in impurity-doped topological insulators has shown that the gap at Dirac point shrinks with reducing temperature. This is an obstacle for experimental realization of quantum anomalous Hall effect higher temperature due to requirement a larger energy gap. In order solve this puzzle, we study by performing temperature-dependent photoemission spectroscopy and X-ray diffraction experiments Cr-doped Bi2Se3. Our valence band revealed alters residual gas condensation on sample...
Renew interest in the charge density wave phase of TiSe$_2$ stems from realization its unique driving mechanism, so called excitonic insulator phase. Existing claims are motivated by model calculations band structure. In this study, angle resolved photoemsision spectroscopy and functional theory for directly compared. The substantial discrepancies found between two descriptions cast serious doubts on exitonic scenario as correct physical mechanism underlying periodic lattice distortion at...
The electronic origin of the structural transition in 1T-VSe$_2$ is re-evaluated through an extensive angle-resolved photoemission spectroscopy experiment. components band structure, missing previous reports, are revealed. Earlier observations, shown to be temperature independent and therefore not correlated with phase transition, explained terms increased complexity structure close Fermi level. Only overall size surface found positively at 110 K. These quite distant from charge density wave...
The performance of spintronic devices depends critically on the ability to control properties high spin-polarization materials such as magnetite (Fe3O4) in thin films. In this work, effect oxygen pressure transport and magnetic Fe3O4 films was extensively investigated. 20 nm were grown MgO (001) substrates using molecular beam epitaxy under different pressure. quality epitaxial judged by observation Verwey transition corroborated x-ray photoemission spectroscopy (XPS). particular,...
Low temperature, high resolution angle resolved photoemission experiments performed on bulk $1T\text{\ensuremath{-}}{\mathrm{TiSe}}_{2}$ samples display conspicuous band folding as the only prominent signature of periodic lattice distortion. The presence a electronic gap supporting charge density wave phase is not confirmed in light new data. These observations cast serious doubts common belief an instability likely origin for observed structural transition ${\mathrm{TiSe}}_{2}$.
Superconductivity in topological insulators is expected to show very unconventional features such as $p+ip$ order parameter, Majorana fermions etc. However, the intrinsic superconductivity has been observed a limited number of materials which pairing symmetry still matter debate. Here, we study crystalline insulator (Pb$_{1-x}$Sn$_x$)$_{1-y}$In$_y$Te, where peculiar superconductor transition was previously reported near gap inversion transition, when system nearly 3-dimensional Dirac...