Hour: From 10:00h to 11:30h
Place: UOC Auditorium
ALI YAZDANI
"VISUALIZATION AND SPECTROSCOPY OF STRONG INTERACTING ELECTRONS IN FLAT BANDS"
By Ali Yazdani (Princeton Center for Complex Materials (PCCM), Princeton, USA)
BIOGRAPHY:
Director, Princeton Center for Complex Materials, and Class of 1909 Professor of Physics, Princeton University. Ali Yazdani is known for his research in advancing our understanding of emergent quantum phenomena by application and development of high-resolution microscopy techniques to directly visualize highly entangled quantum states of matter. He started his own independent research group at the University of Illinois in Urbana-Champaign in 1997 before joining Princeton’s physics department in 2005. Yazdani has held visiting professorships at different universities including at Cambridge University (UK) and has been a Loeb Lecturer at Harvard and an Einstein Lecturer at the Weissman Institute in Israel. For his research accomplishments, he has been recognized with several awards and honors including a Humboldt research award and has been elected a fellow of American Physical Society, American Association for Advancement of Science, American Academy of Arts and Sciences and National Academy of Sciences.
ABSTRACT:
Scanning tunneling microscopy and spectroscopy (STM/STS) are powerful tools to explore the properties of strongly interacting electrons in a variety of systems. In this talk, I will review recent application of this technique to wide range of phenomena in physics of electrons in flat bands. I’ll start with a very recent high-resolution STS mapping of properties of electrons in zeroth Landau level of graphene, and describe how these experiments resolve an old puzzle of strongly interacting electrons in this system. [1] I will then describe a series of experiments on magic angle bilayer graphene, in which flat bands are created not by a magnetic field but rather the interference from the moiré superlattice of these systems. I’ll describe how STM spectroscopy and STS are used to explore strong correlation, discovery topological phases and explore the properties of unconventional superconductivity in these systems [2-5]. Finally, I will describe on going experiments in which we are creating a new type of microscopy technique using graphene as a sensor layer for measurements of compressibility and charge sensing experiments.
REFERENCE(S):
- X. Liu et al. Science 375, 321 (2021)
- Y. Xie. et al. Nature 572, 101 (2019).
- D. Wong, et al. Nature 582, 198 (2020).
- K. Nuckolls et al. Nature 588, 610-615 (2020)
- M. Oh et al. Nature 600, 240-245 (2021)
Hour: From 10:00h to 11:30h
Place: UOC Auditorium
ALI YAZDANI
"VISUALIZATION AND SPECTROSCOPY OF STRONG INTERACTING ELECTRONS IN FLAT BANDS"
By Ali Yazdani (Princeton Center for Complex Materials (PCCM), Princeton, USA)
BIOGRAPHY:
Director, Princeton Center for Complex Materials, and Class of 1909 Professor of Physics, Princeton University. Ali Yazdani is known for his research in advancing our understanding of emergent quantum phenomena by application and development of high-resolution microscopy techniques to directly visualize highly entangled quantum states of matter. He started his own independent research group at the University of Illinois in Urbana-Champaign in 1997 before joining Princeton’s physics department in 2005. Yazdani has held visiting professorships at different universities including at Cambridge University (UK) and has been a Loeb Lecturer at Harvard and an Einstein Lecturer at the Weissman Institute in Israel. For his research accomplishments, he has been recognized with several awards and honors including a Humboldt research award and has been elected a fellow of American Physical Society, American Association for Advancement of Science, American Academy of Arts and Sciences and National Academy of Sciences.
ABSTRACT:
Scanning tunneling microscopy and spectroscopy (STM/STS) are powerful tools to explore the properties of strongly interacting electrons in a variety of systems. In this talk, I will review recent application of this technique to wide range of phenomena in physics of electrons in flat bands. I’ll start with a very recent high-resolution STS mapping of properties of electrons in zeroth Landau level of graphene, and describe how these experiments resolve an old puzzle of strongly interacting electrons in this system. [1] I will then describe a series of experiments on magic angle bilayer graphene, in which flat bands are created not by a magnetic field but rather the interference from the moiré superlattice of these systems. I’ll describe how STM spectroscopy and STS are used to explore strong correlation, discovery topological phases and explore the properties of unconventional superconductivity in these systems [2-5]. Finally, I will describe on going experiments in which we are creating a new type of microscopy technique using graphene as a sensor layer for measurements of compressibility and charge sensing experiments.
REFERENCE(S):
- X. Liu et al. Science 375, 321 (2021)
- Y. Xie. et al. Nature 572, 101 (2019).
- D. Wong, et al. Nature 582, 198 (2020).
- K. Nuckolls et al. Nature 588, 610-615 (2020)
- M. Oh et al. Nature 600, 240-245 (2021)