Large photovoltages in nanogaps

Tunneling of hot electrons generated by plasmon-enhanced optical absorption can lead to comparatively large photovoltages in metal nanogaps. This work, led by Dr. Pavlo Zolotavin was reported in J. Phys. Chem. Lett., and highlighted in a news release. Click here to see a LiveSlides presentation about the work.

Surprising voltage fluctuations

Will Hardy et al. discovered some unusual low-frequency voltage fluctuations in strontium titanate quantum wells. These fluctuations grow as temperature is decreased, even in the absence of a driving current. We posit that they come from etching-related fluctuating defects modulating the local thermoelectric properties of the material.

Shot noise in hBN tunnel junctions

Panpan Zhou et al. have demonstrated through shot noise measurements that atomically thin hexagonal boron nitride (hBN) is an excellent tunnel barrier. This opens up the possibility of using hBN to enable tunneling noise spectroscopy on a variety of complex materials.