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Bridging Hubbard model physics and quantum Hall physics in graphene moire superlattices

Author(s)
Zhang, Yahui,Ph.D.Massachusetts Institute of Technology.
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Massachusetts Institute of Technology. Department of Physics.
Advisor
Senthil Todadri.
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MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided. http://dspace.mit.edu/handle/1721.1/7582
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Abstract
This thesis is focused on the strongly correlated physics of graphene moiré superlattices formed in twisted bilayer graphene (TBG), twisted double bilayer graphene (TDBG) and ABC trilayer graphene aligned with hexagon boron nitride (TLG-hBN). First, I will show that the physics of these systems can be divided into two categories: (1)The nearly-flat bands have non-zero valley Chern number, which leads to "quantum Hall physics" including integer and fractional quantum anomalous Hall effect and composite fermi liquid (CFL) physics. (2) The narrow bands have trivial band topology. In this case the essential physics is captured by a Hubbard like lattice model similar to that of the high T[subscript c] cuprates. Both of the above two classes have already been realized in the experiments. I will discuss how current and future experiments on these moiré materials can deepen our understanding of the cuprate physics and quantum Hall physics. In addition, I will also propose several new phases in moiré systems, which have never been studied before. These include featureless and orthogonal pseudogap metals and quantum Hall spin liquids.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019
 
Cataloged from PDF of thesis.
 
Includes bibliographical references (pages 139-152).
 
Date issued
2019
URI
https://hdl.handle.net/1721.1/128094
Department
Massachusetts Institute of Technology. Department of Physics
Publisher
Massachusetts Institute of Technology
Keywords
Physics.

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