Materials Literature
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Anisotropic materials, with orientation-dependent properties, have attracted more and more attention due to their compelling tunable and flexible performance in electronic and optomechanical devices. So far, two-dimensional (2D) black phosphorus shows the largest known anisotropic behavior, which is highly desired for…
The availability of accessible fabrication methods based on deterministic transfer of atomically thin crystals has been essential for the rapid expansion of research into van der Waals heterostructures. An inherent issue of these techniques is the deformation of the polymer carrier film during the transfer, which can…
Tungsten ditelluride ${\mathrm{WTe}}_{2}$ is a type-II Weyl semimetal with electronic properties highly sensitive to external pressure, as demonstrated by the superconductivity emerging under pressure. Here we study the optical conductivity of the type-II Weyl semimetal ${\mathrm{WTe}}_{2}$ under external pressure at…
Molecular adsorption at organic/metal interfaces depends on a range of mechanisms: covalent bonds, charge transfer, Pauli repulsion and van der Waals (vdW) interactions shape the potential energy surface (PES), making it key to understanding organic/metal interfaces. Describing such interfaces with density functional…
Energy harvesting is a concept which makes dissipated heat useful by transferring thermal energy to other excitations. Most of the existing principles are realized in systems which are heated continuously. We present the concept of high-frequency energy harvesting where the dissipated heat in a sample excites resonant…
The nickelate $\mathrm{P}{\mathrm{r}}_{4}\mathrm{N}{\mathrm{i}}_{3}{\mathrm{O}}_{8}$ features quasi-two-dimensional layers consisting of three stacked square-planar $\mathrm{Ni}{\mathrm{O}}_{2}$ planes, in a similar way to the well-known cuprate superconductors. The mixed-valent nature of Ni and its metallic propertie…
This work presents a parameter-free approach to quantitatively predict the response of two-dimensional valleytronics materials to an external magnetic field. The authors predict Landau levels that match well to those deduced from recent optical experiments
We report epitaxial growth of vanadium diselenide (${\mathrm{VSe}}_{2}$) thin films in the octahedrally coordinated (1T) structure on GaAs(111)B substrates by molecular beam epitaxy. Film thickness from a single monolayer (ML) up to 30 ML is demonstrated. Structural and chemical studies using x-ray diffraction, transm…
Based on the electronic band structure obtained from first-principles Hubbard corrected $U$ density functional theory $(\mathrm{DFT}+U)$ calculations, the optical spectra of yttrium and neodymium nickelates are computed. We show that the results are in fair agreement with available experimental data. We clarify the el…
We study the thickness dependence of the electronic, magnetic, and optical properties of a ${\mathrm{NiPS}}_{3}$ thin film, which is an antiferromagnetic charge-transfer insulator. Utilizing state-of-the-art advanced density functionals, we find the antiferromagnetic zigzag order, the band gap, and the main peaks in t…
We investigate the magnetic properties of ${\mathrm{Ru}}_{2}\mathrm{Mn}Z$ ($Z\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}\mathrm{Sn},\mathrm{Sb},\mathrm{Ge},\mathrm{Si}$) chemically ordered, full Heusler compounds for zero as well as finite temperatures. Based on first-principles calculations we derive th…
This paper evaluates qualitatively as well as quantitatively the accuracy of a recently proposed Peierls–Nabarro Finite Element (PN-FE) model for dislocations by a direct comparison with an equivalent molecular statics simulation. To this end, a two-dimensional microstructural specimen subjected to simple shear is con…
Quantum anomalous Hall effect (QAHE) has been experimentally observed in magnetically doped topological insulators. However, ultralow temperatures (usually below 300 mK), which are mainly attributed to inhomogeneous magnetic doping, become a daunting challenge for potential applications. Here, a nonmagnetic-doping str…
This paper introduces the chain lattice, a hierarchical truss structure comprising two interpenetrating lattices. One lattice toughens the material and prevents catastrophic localized failure while the other lattice serves as a porous matrix that densifies to absorb energy during tensile loading. Chain lattices are am…
Ferromagnetic Ni2MnGa-based alloys play an important role in technological fields, such as smart actuators, magnetic refrigeration and robotics. The possibility of obtaining large non-contact deformation induced by an external perturbation is one of its key strengths for applications. However, the search for materials…
YBCO fabrics composed of nanowires, produced by solution blow spinning (SBS) are so brittle that the Lorentz force produced by induced currents can be strong enough to damage them. On the other hand, it is known that silver addition improves the mechanical and flux pinning properties of ceramic superconductors. Thus,…
The generic 1-bond:2-mode percolation type Raman signal inherent to the short bond of common (A,B)C semiconductor mixed crystals with zincblende (cubic) structure is exploited as a sensitive mesoscope to explore how various ZnSe-based systems engage their pressure-induced structural transition (to rock-salt) at the su…
Monolayer transition metal dichalcogenide semiconductors, with versatile experimentally accessible exciton species, offer an interesting platform for investigating the interaction between excitons and a Fermi sea of charges. Using hexagonal boron nitride encapsulated monolayer MoSe2, we study the impact of charge dens…
Traditional refrigeration technologies based on compression cycles of greenhouse gases pose serious threats to the environment and cannot be downscaled to electronic device dimensions. Solid-state cooling exploits the thermal response of caloric materials to external fields and represents a promising alternative to cu…
For powder samples of CuAl$_{1-x}$Fe$_x$O$_2$ ($x =$ 0, 0.01, 0.05, and 0.1), measured optical properties are compared with model simulations and phonon spectra are compared with simulations based on weighted dynamical matrix approach.