Structural Comparison of Aromatic and Aliphatic Chiral Peptoid Oligomers.

Atomistic simulations of peptoids have the capability to predict structure-property relationships, depending on the accuracy of the associated force field. This work presents an addendum to the CGenFF-NTOID peptoid force field for aliphatic side chains. We develop parameters for two aliphatic side chains, R1-tertiary butylethyl glycine () and S1-tertiary butylethyl glycine ().

Manipulating chiral spin transport with ferroelectric polarization.

A magnon is a collective excitation of the spin structure in a magnetic insulator and can transmit spin angular momentum with negligible dissipation. This quantum of a spin wave has always been manipulated through magnetic dipoles (that is, by breaking time-reversal symmetry). Here we report the experimental observation of chiral spin transport in multiferroic BiFeO and its control by reversing the ferroelectric polarization (that is, by breaking spatial inversion symmetry).

Thermally generated spin current in the topological insulator BiSe.

We present measurements of thermally generated transverse spin currents in the topological insulator BiSe, thereby completing measurements of interconversions among the full triad of thermal gradients, charge currents, and spin currents. We accomplish this by comparing the spin Nernst magneto-thermopower to the spin Hall magnetoresistance for bilayers of BiSe/CoFeB. We find that BiSe does generate substantial thermally driven spin currents.

Using Enhanced Sampling Simulations to Study the Conformational Space of Chiral Aromatic Peptoid Monomers.

Peptoids, or N-substituted glycines, are peptide-like materials that form a wide variety of secondary structures owing to their enhanced flexibility and a diverse collection of possible side chains. Compared to that of peptides, peptoids have a substantially more complex conformational landscape. This is mainly due to the ability of the peptoid amide bond to exist in both - and -conformations.

Gate-Tunable Anomalous Hall Effect in a 3D Topological Insulator/2D Magnet van der Waals Heterostructure.

We demonstrate advantages of samples made by mechanical stacking of exfoliated van der Waals materials for controlling the topological surface state of a three-dimensional topological insulator (TI) via interaction with an adjacent magnet layer. We assemble bilayers with pristine interfaces using exfoliated flakes of the TI BiSbTeSe and the magnet CrGeTe, thereby avoiding problems caused by interdiffusion that can affect interfaces made by top-down deposition methods. The samples exhibit an anomalous Hall effect (AHE) with abrupt hysteretic switching.

Synthesis and optimization of photoluminescence properties in potential reddish orange emitting niobate phosphor for photonic device applications.

A series of samarium ions (Sm ) activated barium sodium niobate (Ba NaNb O ) samples have been successfully synthesized via employing a solid-state reaction technique. Single phase, crystalline tetragonal Ba NaNb O were formed and the crystallite size of the prepared sample varied with doping of Sm ions. The scanning electron microscopy (SEM) images of Ba NaNb O :Sm illustrate that the particles possess a non-uniform spherical structure with some agglomeration.

Effects of Anisotropic Strain on Spin-Orbit Torque Produced by the Dirac Nodal Line Semimetal IrO.

We report spin-torque ferromagnetic resonance studies of the efficiency of the damping-like (ξ) spin-orbit torque exerted on an adjacent ferromagnet film by current flowing in epitaxial (001) and (110) IrO thin films. IrO possesses Dirac nodal lines (DNLs) in the band structure that are gapped by spin-orbit coupling, which could enable a very high spin Hall conductivity, σ. We find that the (001) films do exhibit exceptionally high ξ ranging from 0.