报告题目：The Quantum Twisting Microscope

报告人：Jiewen Xiao，Weizmann Institute

时间: 10月30日上午10:00

地点：理科楼三楼报告厅

摘要：Measuring the energy-momentum dispersion relation in quantum materials can provide key insights into their strongly correlated electronic phenomena. We have recently demonstrated a new type of a scanning probe microscope – the Quantum Twisting Microscope (QTM)1 – capable of measuring electrons in momentum space in a similar way to the way a scanning tunneling microscope (STM) measures electrons in real-space. The QTM is based on a van-der-Waals (vdW) heterostructure on a tip, which, when brought into contact with another vdW sample, allows electrons to tunnel into it at many locations quantum coherently. With an extra twist degree of freedom, this microscope becomes a momentum-resolving local scanning probe. The first version of QTM operated at room temperature, and we demonstrated quantum coherence at the tip and directly image the energy bands of monolayer and twisted bilayer graphene1. Recently, we generalized the QTM to cryogenic temperatures and use the QTM to image neutral excitations by the momentum resolved inelastic tunneling.

1. Alon Inbar*, John Birkbeck*, Jiewen Xiao*, Takashi Taniguchi, Kenji Watanabe, Binghai Yan, Yuval Oreg, Ady Stern, Erez Berg, and Shahal Ilani. The Quantum Twisting Microscope. Nature 614, 682–687 (2023).