Several clusters of semiconducting nanorods are being illuminated by blue light. The nanorods absorb blue light, become excited and emit red light. The emission of light by individual nanorods occurs in a random fashion with the nanorod turning "on" and "off" for variable lengths of time.
Recent physics research shows how spin-orbit coupling can rearrange electronic bands in a solid to make a "topological insulator" - a new quantum phase of matter with conductive surfaces even though its bulk is insulating. Penn physicists Professor Charlie Kane and Professor Gene Mele pioneered the theoretical discovery of such materials in 2005.
Cargo vesicles traveling along microtubles
Cargo vesicles (stained with green fluorescent dye) travelling along microtubules (stained red) in a living cell as studied in Professor Phil Nelson's group.
DES First Light
One of the first images from the DECam (the half-gigapixel camera of the Dark Energy Survey) showing the barred spiral galaxy NGC 1365. Penn faculty and staff play a prominent role in leading the DES effort.
Reflective Self-Assembling Proteins
Prof. Alison Sweeney studies the biophysical properties of reflectin - a highly reflective and self-organizing squid protein found in cephalopods like the Hawaiian Bobtail squid shown here.
This work, "Lassoing saddle splay and the
geometrical control of topological defects," was done with postdoctoral
fellow Max Lavrentovich. The two work with Professors Randy Kamien
(Physics and Astronomy) and Kate Stebe (Chemical and Biomolecular Engineering).