Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene
· Invited
Abstract
The discovery of superconducting and insulating states in magic-angle twisted bilayer graphene (MATBG)1,2 has ignited considerable interest in understanding the nature of electronic interactions in this chemically pristine material. The transport properties of MATBG as a function of doping are similar to those of high-transition-temperature copper oxides and other unconventional superconductors1-3, which suggests that MATBG may be a highly interacting system. However, there is no direct experimental evidence of strong many-body correlations in MATBG. In this talk, I will present the unusual spectroscopic characteristics found on MATBG, obtained using a scanning tunneling microscope, and describe how these correlated features allow us to establish a more concrete connection between MATBG and high-Tc cuprates beyond the phenomenological resemblance of their transport phase diagrams4.
1. Cao,Y et al. Nature 556, 80–84 (2018).
2. Cao,Y et al. Nature 556, 43–50 (2018).
3. Lee, P. A. et al. Rev. Mod. Phys. 78, 17 (2006).
4. Xie, Y et al. Nature 572, 101-105 (2019).
1. Cao,Y et al. Nature 556, 80–84 (2018).
2. Cao,Y et al. Nature 556, 43–50 (2018).
3. Lee, P. A. et al. Rev. Mod. Phys. 78, 17 (2006).
4. Xie, Y et al. Nature 572, 101-105 (2019).
*This work has been primarily supported by the Gordon and Betty Moore Foundation as part of the EPiQS initiative (GBMF4530) and DOE-BES grant DE-FG02-07ER46419. Other support for the experimental work was provided by NSF-MRSEC programmes through the Princeton Center for Complex Materials DMR-142054, NSF-DMR-1608848, ExxonMobil through the Andlinger Center for Energy and the Environment at Princeton, and the Princeton Catalysis Initiative.
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Presenters
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Yonglong Xie
- Princeton University
- Department of Physics, Harvard University
- Harvard University