Local thermodynamic probe of correlated electrons in moiré systems
Abstract/Contents
- Abstract
- The emergence of "moiré materials", heterostructures formed by twisting and stacking atomically thin layers, has inaugurated a new era for investigating correlated electronic systems. They offer unprecedented tunability over band structure, electronic interactions and topology. In this dissertation, I will present my works on the use of a specialized scanning probe microscope, a scanning single-electron transistor (SET), to locally investigate correlated states in a diverse array of moiré systems. The SET probes the local compressibility and chemical potential of an electronic system with unparalleled resolution, enabling access to the delicate interaction-driven incompressible (insulating) phases and their phase transitions. In this dissertation, I will first summarize instrumentation efforts to set up two different scanning SET systems at Stanford University, which were used to carry out scientific projects described in this dissertation. I will then describe measurements on a selection of representative examples from two distinct classes of moiré materials. In magic-angle twisted bilayer graphene, I explore both the interacting Chern and Hofstadter physics in the high magnetic field regime, as well as the enigmatic correlated insulators found at low magnetic fields. In a semiconductor moiré heterobilayer WSe2/MoSe2, I describe measurements that reveal the coexistence of flat and dispersive moiré bands that leads to intricate competitions between Hofstadter and unconventional charge-ordered states. In a twisted double bilayer WSe2 system, I discuss how the introduction of Γ−valley moiré bands leads to new correlated ground states and charge excitations. Through these measurements, I will demonstrate how the local thermodynamic sensing capabilities of scanning SET synergize with the high tunability of moiré materials in uncovering novel correlated electronic phases.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Yu, Jiachen |
|---|---|
| Degree supervisor | Feldman, Ben (Benjamin Ezekiel) |
| Degree supervisor | Goldhaber-Gordon, David, 1972- |
| Thesis advisor | Feldman, Ben (Benjamin Ezekiel) |
| Thesis advisor | Goldhaber-Gordon, David, 1972- |
| Thesis advisor | Heinz, Tony F |
| Degree committee member | Heinz, Tony F |
| Associated with | Stanford University, School of Humanities and Sciences |
| Associated with | Stanford University, Department of Applied Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Jiachen Yu. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/kr187bt5498 |
Access conditions
- Copyright
- © 2023 by Jiachen Yu
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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