EE Student Information

The Department of Electrical Engineering supports Black Lives Matter. Read more.

• • • • •

EE Student Information, Spring Quarter through Academic Year 2020-2021: FAQs and Updated EE Course List.

Updates will be posted on this page, as well as emailed to the EE student mail list.

Please see Stanford University Health Alerts for course and travel updates.

As always, use your best judgement and consider your own and others' well-being at all times.

Exploring the Landscape of Interacting Topological Insulators [Applied Physics/Physics]

Exploring the Landscape of Interacting Topological Insulators
Tuesday, February 21, 2017 - 4:30pm
Hewlett 200
Rui-Rui Du (Rice University)
Abstract / Description: 

The past decade has seen a phenomenal rise of topological insulators and superconductors. The first discovery, led by the Stanford group and the Wurzburg group, concerns a planar material of a "quantum spin Hall topological insulator," which acts as an electronic superhighway. It is one of the building blocks needed to create future electronics and computers. In this talk I will show, as proposed by the Stanford group, that such insulators can be built from common compound semiconductors containing a double-layer of electrons and holes, created by band-gap engineering using molecular beam epitaxy and electrostatic gates. The material supports quantized one dimensional helical edge modes. Quite surprisingly, here we find a superhighway with puzzling twists, for which electron-electron interactions may be responsible. Amazingly, due the interactions between electron and holes, our recent optical and transport experiment confirm that the material can become a superconductor, where the pairing of electron and holes resembles the Cooper pair in ordinary superconductors.

Reference: X. L. Qi,S. C. Zhang, Review of Modern Physics, 83(4), 175 (2010)