Spectroscopic studies on electronic correlation and lattice coupling in hole-doped high-Tc cuprates
Abstract/Contents
- Abstract
- Systematic, high resolution investigation of the single-particle properties of the heavily overdoped high-Tc superconductor Bi-2212 is carried out with angle-resolved photoemission spectroscopy (ARPES). We find quantitatively that the weak-coupling limit can be reached in this regime, but respectable superconducting fluctuation still persists, and the system is not completely Fermi-liquid which has long been assumed. We measure the particle-hole mixing ratio near the antinode, locate the origin for such fluctuation to the abnormally flat band near the zone boundary in Bi-2212, and explain why Bi-2212 was once considered an example of BCS-BEC crossover system. This provides the first clear momentum perspective to resolve the BCS vs BEC contention in overdoped cuprates. We discover an abrupt change in electron-phonon coupling and the superconducting gap across the critical doping in high-Tc system Bi-2212. This not only reveals the correlation between the mode-coupling and the superconductivity, but also signifies the importance to factor in the lattice degree of freedom when constructing future theories on intertwining electronic orders in the cuprates. Using inelastic x-ray scattering (IXS) and Raman spectroscopy, we also identify of a universal low-energy phonon-broadening in both charge ordered and non-charge ordered region of Bi-2212. Its origin is discussed to favor intrinsic acoustic-optical phonon hybridization rather than the previously suggested charge order induced softening. As a conceptual extension of the previous section, lattice instability may be an indispensable ingredient in the charge order phenomenon in underdoped cuprates. We develop and benchmark a 114nm (11eV) high repetition rate laser as an ARPES lightsource. This setup bridges the application gap between the synchrotron ARPES (access to the full momentum space and valence band) and traditional 6/7eV laser-ARPES (high resolution and high stability).
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 | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | He, Yu |
|---|---|
| Degree supervisor | Shen, Zhi-Xun |
| Thesis advisor | Shen, Zhi-Xun |
| Thesis advisor | Devereaux, Thomas Peter, 1964- |
| Thesis advisor | Kivelson, Steven |
| Degree committee member | Devereaux, Thomas Peter, 1964- |
| Degree committee member | Kivelson, Steven |
| Associated with | Stanford University, Department of Applied Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yu He. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Yu He
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...