A5018912983- Rare-earth and actinide compounds
- Iron-based superconductors research
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Heusler alloys: electronic and magnetic properties
- Physics of Superconductivity and Magnetism
- Molecular Junctions and Nanostructures
- Magnetic properties of thin films
- 2D Materials and Applications
- Magnetic Properties of Alloys
- Intermetallics and Advanced Alloy Properties
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- MXene and MAX Phase Materials
- Advanced Welding Techniques Analysis
- Metallurgical and Alloy Processes
- Semiconductor materials and interfaces
- Nanowire Synthesis and Applications
- Quantum and electron transport phenomena
- Advanced Materials Characterization Techniques
- Electronic and Structural Properties of Oxides
Ames National Laboratory
2022-2024
Iowa State University
2022-2024
University of Northern Iowa
2019-2021
The recent discovery of Fermi arcs and new magnetic bands splitting in antiferromagnet NdBi has opened up avenues for exploration. This study shows that these uncharted effects are not restricted to NdBi, but also emerge other rare-earth monopnictides. Also, it the relative intensity scale with moments elements.
The recent discovery of unconventional surface-state pairs, which give rise to Fermi arcs and spin textures, in antiferromagnetically ordered NdBi raised the interest rare-earth monopnictides. Several scenarios antiferromagnetic (AFM) order have been suggested explain origin these states with some them being consistent presence nontrivial topologies. In this paper, we use angle-resolved photoemission spectroscopy (ARPES) density-functional-theory (DFT) calculations investigate electronic...
Eu-based Zintl-phase materials $\mathrm{Eu}{A}_{2}P{n}_{2}$ $(A=\mathrm{Mg},\mathrm{In},\mathrm{Cd},\mathrm{Zn};Pn=\mathrm{Bi},\mathrm{Sb},\mathrm{As},\mathrm{P})$ have generated significant recent interest owing to the complex interplay of magnetism and band topology. Here, we investigated crystallographic, magnetic, electronic properties layered single crystals ${\mathrm{EuMg}}_{2}{\mathrm{Sb}}_{2}$ with trigonal ${\mathrm{CaAl}}_{2}{\mathrm{Si}}_{2}$ crystal structure (space group...
The orthorhombic compound ${\mathrm{AuSn}}_{4}$ is compositionally similar to the Dirac node arc semimetal ${\mathrm{PtSn}}_{4}$. is, contrary ${\mathrm{PtSn}}_{4}$, superconducting with a critical temperature of ${T}_{c}=2.35$ K. Recent measurements present indications for quasi-two-dimensional behavior in ${\mathrm{AuSn}}_{4}$. Here we density states and band structure through scanning tunneling microscopy angular resolved photoemission spectroscopy (ARPES). gap values different portions...
The interest in the rare-earth monopnictides was boosted after discovery of unconventional surface-state pairs antiferromagnetically ordered NdBi. In contrast to other materials which such states were reported, CeBi is known have multiple antiferromagnetic phases. this study, we perform angle-resolved photoemission spectroscopy (ARPES) measurements conjunction with density functional theory (DFT) calculations investigate evolution electronic structure upon a series (AFM) transitions. We find...
We use high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) to investigate the electronic structure of charge wave (CDW) system ${\mathrm{LaSb}}_{2}$. This compound is among an interesting group materials that manifests both a CDW transition lower temperature superconductivity. find DFT calculations be in good agreement with our ARPES data. The Fermi surface ${\mathrm{LaSb}}_{2}$ consists two small hole pockets close...
Abstract Here, we present results of a computational and experimental study adsorption various metals on MoS2. In particular, analyzed the binding mechanism four metallic elements (Ag, Au, Cu, Ni) Among these elements, Ni exhibits strongest lowest mobility surface On other hand, Au Ag bond very weakly to have high mobilities. Our calculations for Cu show that its bonding are between two groups. Experimentally, films exhibit composition characterized by randomly oriented nanoscale clusters....
Half-metallic Heusler alloys have been intensively studied in recent years due to their potential applications spin-based devices, e.g., magnetic tunnel junctions. Yet, properties may be very sensitive the choice of substrates, i.e., epitaxial strain and interface properties. Here, we report results our computational work on half-Heusler compound CrMnSb(1−x)Px. In particular, demonstrate that parent CrMnSb is close a half-metallic material at optimized lattice parameter, with onset bandgap...
Scanning tunneling microscopy measurements on Ag(111)/$\mathrm{Mo}{\mathrm{S}}_{2}$ reveal atomically flat preferred, or ``magic,'' heights occurring at 6, 10, and 14 atomic layers. These results are consistent with Ag growth a variety of semiconducting substrates correlate electronic energy savings in structure calculations freestanding Ag(111) films. Thus, under certain conditions, will spontaneously form quantized structures independent the substrate. To explain this, we have found Fermi...
Nanoscale device fabrication requires control over film growth at the atomic scale. Growth conditions must be tuned in consideration of interface parameters like chemical bonding, surface free energy, and lattice matching. In metals, electronic properties may also utilized for physical parameters. Quantum size effects can induce metals to spontaneously form specific shapes sizes according their structure. Unfortunately, such is generally known only a few systems typically stable under...
We use high-resolution angle resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) to investigate the electronic structure of charge wave (CDW) system LaSb$_2$. This compound is among an interesting group materials that manifests both a CDW transition lower temperature superconductivity. find DFT calculations be in good agreement with our ARPES data. The Fermi surface LaSb$_2$ consists two small hole pockets close $\Gamma$ four larger near Brillouin zone (BZ)...
The recent discovery of unconventional surface-state pairs, which give rise to Fermi arcs and spin textures, in antiferromagnetically ordered rare-earth monopnictides attracted the interest these materials. We use angle-resolved photoemission spectroscopy (ARPES) measurements conjunction with density functional theory (DFT) calculations investigate evolution electronic structure GdBi DyBi. find that new surface states, including a Dirac cone, emerge AFM state. However, they are located along...
EuAl$_4$ is proposed to host a topological Hall state. This material also undergoes four consecutive antiferromagnetic (AFM) transitions upon cooling below TN1 = 15.4 K in the presence of charge density wave (CDW) order that sets TCDW 140 K. We use angle-resolved photoemission spectroscopy and density-functional-theory calculations study how magnetic ordering affects electronic properties EuAl$_4$. found changes band structure each AFM including splitting, renormalizations, appearance new...
We perform angle-resolved photoemission spectroscopy (ARPES) measurements in conjunction with density functional theory (DFT) calculations to investigate the evolution of electronic structure CeBi upon a series antiferromagnetic (AFM) transitions. find evidence for new AFM transition addition two previously known from transport studies. demonstrate development an additional Dirac state (+-+-) ordered phase and transformation unconventional surface-state pairs (++--) phase. This revises...
The orthorhombic compound AuSn4 is compositionally similar to the Dirac node arc semimetal PtSn$_4$. AuSn$_4$ is, contrary PtSn$_4$, superconducting with a critical temperature of T$_c$ = 2.35 K. Recent measurements present indications for quasi two-dimensional behavior in AuSn$_4$. Here we density states and band structure through Scanning Tunneling Microscopy (STM) Angular Resolved Photoemission Spectroscopy (ARPES). gap values different portions Fermi surface are spread around Δ0 0.4 meV,...
The recent discovery of unconventional surface state pairs, which give rise to Fermi arcs and spin textures, in antiferromagnetically ordered NdBi raised the interest rare-earth monopnictides. Several scenarios antiferromagnetic order have been suggested explain origin these states with some them being consistent presence non-trivial topologies. In this study, we use angle-resolved photoemission spectroscopy (ARPES) density-functional-theory (DFT) calculations investigate electronic...