Introducing spin-orbit interaction in graphene

The excellent electron properties of graphene, an atomically-thin material with record-high carrier mobility and gate tunability, make it central to modern nanoscience. However, the spin-orbit interaction (SOI) naturally present in graphene is extremely weak and has yet to be observed experimentally. This presents an obstacle for accessing novel phenomena in transport and optics, in particular those related to topological properties. This thesis seeks to address this limitation by artificially introducing SOI in graphene sandwiched between other atomically-thin materials that can produce an interfacial SOI in graphene. In particular, it is demonstrated that a strong SOI, naturally present in the two-dimensional materials such as transition metal dichalcogenides (TMD), can be partially transferred to graphene via the proximity effect. We predict a range of novel phenomena arising in graphene bilayers with layer-asymmetric SOI induced by a proximal TMD layer. These include a gate-tunable SOI, a gate-tunable intrinsic valley-Hall conductivity, as well as a gate-tunable edge conductivity, to name just a few. These findings will facilitate exploring previously inaccessible spin-related phenomena in graphene and other van der Waals heterostructures.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Physics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2018

Author dc:creator

• Khoo, Jun Yong

Advisor dc:contributor.advisor

• Leonid S. Levitov.

• Physics.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/119929

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/119929