Anomalous spatial shifts in interface electronic scattering

Abstract

The anomalous spatial shifts at interface scattering, first studied in geometric optics, recently found their counterparts in the electronic context. It was shown that both longitudinal and transverse shifts, analogous to the Goos-Hänchen and Imbert-Fedorov effects in optics, can exist when electrons are scattered at a junction interface. More interestingly, the shifts are also discovered in the process of Andreev reflection at a normal/superconductor interface. Particularly, for the case with unconventional superconductors, it was discovered that the transverse shift can arise solely from the superconducting pair potential and exhibit characteristic features depending on the pairing. Here, we briefly review the recent works in this field, with an emphasis on the physical picture and theoretical understanding. arXiv:1901.00294v1 [cond-mat.mes-hall]

Polyimide Nanocomposites Filled with SiO2 Nanoparticles of Different Sizes for High-Temperature Energy Storage

“…It is clear that the breakdown strength peak and β strength peak of 20 nm-SiO 2 /PI nanocomposites are higher than those of the 100 nm-SiO 2 /PI and 50 nm-SiO 2 /PI nanocomposites. This indicates that the high specific surface area of ultrafine nanoparticles is more likely to form scattering centers at the interface, which may substantially suppress the carrier migration to maximize E b . − Moreover, the strong peak of β also appears at this position, which proves that 20 nm-SiO 2 /PI has the highest stability and reliability.…”

Improvement of high‐temperature energy storage properties of polyimide‐based nanocomposites with sandwich structure

“…Due to the wider forbidden wide‐band of SiO 2 (≈9 eV), the E b is higher, which improves the overall breakdown of nanocomposites significantly. Due to the low loading of SrTiO 3 , it can be evenly dispersed within the matrix, with the interfaces forming scattering centers that may impede carrier mobility, thus increasing the breakdown E b 4,32–34 . With the increase of SrTiO 3 filler, the composite introduces more defects and changes the original good quality, such as agglomeration, connections, and so on, thus decreasing the E b .…”

Super-Andreev reflection and longitudinal shift of pseudospin-one fermions

“…It is interesting to explore the similar effects when pair potential is of unconventional type, e.g., p-wave or d-wave. The different pairing symmetry should have a strong effect on the Andreev reflection amplitude as well as the anomalous spatial shift [29,44]. Second, besides pseudospin-1, recent works have revealed a variety of novel emergent fermions both in 2D and 3D [4-8, 45, 46].…”

“…Furthermore, we study the longitudinal (Goos-Hänchen-like) spatial shift which occurs in this interface scattering process. The existence of such longitudinal shift during the Andreev reflection was only discovered recently [28,29].…”