Harvard Quantum Initiative Special Seminar
Friday, August 30
11:00 AM
Jefferson 356
Yonglong Xie (Princeton)
Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer
graphene
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 superconductors [1-3], 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 diagrams [4]. Finally, I will discuss the possibility of symmetry-broken
ground states in MATBG and the prospects of probing these states using novel quantum
transport and scanning probe techniques.
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).
Clare Ploucha
Director of Programs
Harvard Quantum Initiative
17 Oxford Street, Jefferson 357
Cambridge, MA 02138
P: 617-495-3388
Show replies by date