Component design and stable SESAM mode-locking of the disorder middle entropy Yb:CaSrBaF single crystal.

To the best of our knowledge, this is the first report on continuous and passively mode-locked operation of the multi-component fluoride CaSrBaF crystal. A novel disorder laser material, Yb:CaSrBaF (CaSrBaF) of multi-component middle entropy crystal was designed and grown by temperature gradient technique (TGT) for the first time. X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis of Yb:CaSrBaF crystal reveals that Ca, Sr, and Ba of near equal atomic ratio (1:1:1) have formed a homogeneous single-phased fluorite solid solution.

Evidence for an edge supercurrent in the Weyl superconductor MoTe.

Edge supercurrents in superconductors have long been an elusive target. Interest in them has reappeared in the context of topological superconductivity. We report evidence for the existence of a robust edge supercurrent in the Weyl superconductor molybdenum ditelluride (MoTe).

Synthesis and luminescence properties of CaSnO :Bi blue phosphor and the emission improvement by Li ion.

CaSnO :Bi blue-emitting phosphor was synthesized using a high-temperature solid-state reaction method in air. The crystal structures and luminescence properties were investigated. A broad emission band peaking at ~448 nm upon excitation at 262 and 308 nm was observed in the range 330-680 nm at room temperature due to P  →  S transition of the Bi ion.

Large discrete jumps observed in the transition between Chern states in a ferromagnetic topological insulator.

A striking prediction in topological insulators is the appearance of the quantized Hall resistance when the surface states are magnetized. The surface Dirac states become gapped everywhere on the surface, but chiral edge states remain on the edges. In an applied current, the edge states produce a quantized Hall resistance that equals the Chern number C = ±1 (in natural units), even in zero magnetic field.

Sn-doped Bi1.1Sb0.9Te2S bulk crystal topological insulator with excellent properties.

A long-standing issue in topological insulator research has been to find a bulk single crystal material that provides a high-quality platform for characterizing topological surface states without interference from bulk electronic states. This material would ideally be a bulk insulator, have a surface state Dirac point energy well isolated from the bulk valence and conduction bands, display quantum oscillations from the surface state electrons and be growable as large, high-quality bulk single crystals. Here we show that this material obstacle is overcome by bulk crystals of lightly Sn-doped Bi1.

Evidence for the chiral anomaly in the Dirac semimetal Na₃Bi.

In a Dirac semimetal, each Dirac node is resolved into two Weyl nodes with opposite "handedness" or chirality. The two chiral populations do not mix. However, in parallel electric and magnetic fields ( E: || B: ), charge is predicted to flow between the Weyl nodes, leading to negative magnetoresistance.