Huanhuan Wang

TL;DR: The thickness-modulated spontaneously formed lateral WSe2-WSe2 homojunction photodiodes are reported, which have unique band structure with a unilateral depletion region and can achieve a high detectivity and fast photoresponse speed under zero external voltage.

TL;DR: In this article, a systematic study on the thickness-dependent superconductivity and transport properties in exfoliated layered topological superconductor β-PdBi2 was conducted.

Abstract: Recently, the Zintl phase SrIn2P2single crystal was proposed to be a topological insulator candidate under lattice strain. Here, we report systematic electrical transport studies on the unstrained layered SrIn2P2single crystals. The resistance presents a minimum value aroundTc= 136 K and then increases remarkably at low temperature. Distinct negative magnetoresistance belowTc, combined with the anomalous resistance, implies the carriers are weak localized at low temperature due to strong quantum coherence. Further analysis based on three-dimensional weak localization (WL) model suggests that the electron-phonon interaction dominates the phase decoherence process. Moreover, Hall measurements indicate that the transport properties are mainly dominated by hole-type carriers, and the WL effect is obviously affected by the carrier transport. These findings not only provide us a promising platform for the fundamental physical research but also open up a new route for exploring the potential electronic applications.

TL;DR: In this article , the authors report systematic studies on thickness-dependent magnetotransport properties of trigonal layered PtBi2 and show that when the thickness decreases, the metallicity is gradually suppressed, and it ultimately displays a semiconductor-like behavior when reduced to 22'nm.