Spin liquids and qubits probed by STM
by
TDLI Meeting Room N600 (East Wing of Floor 6, North Building)
Quantum spin systems have attracted increasing attention in recent years for two reasons: individual spins, if well controlled, are promising quantum information carriers, while many quantum spins put together can yield novel phases of matter that host exotic excitations. This talk focuses on a particular class of quantum spins on material surfaces that are probed by STM. In the first part of this talk, I will describe our recent efforts to bring STM into the field of quantum spin liquids, where we found surprising metal-like behavior in a 2D Mott insulator, single-layer 1T-TaSe2 [1-3]. In the second part, I will introduce new microwave-STM techniques that culminate in the realization of the first atomic-scale multi-qubit platform, where, contrary to conventional wisdom, STM-based readout and control go beyond the tunnel junction [4].
[1] Nature Physics 16, 218 (2020).
[2] Nature Physics 17, 1154 (2021).
[3] Nature Physics 18, 1335 (2022).
[4] Science 382, 87 (2023).
Yi Chen received B.S. in physics from Peking University in 2014 and Ph.D. in Physics from University of California, Berkeley in 2020. At Berkeley, he worked with Michael Crommie on scanning probe studies of two-dimensional correlated materials. Following his graduate studies, Yi Chen became a postdoctoral researcher at Center for Quantum Nanoscience, working with Andreas Heinrich on exploring quantum coherence with atomic probe techniques. Yi Chen joined Peking University as an Assistant Professor in February 2023.
