Controlling Atomic-scale Magnetism
Abstract
Approved for Public Release.This proposals objective is to extend the ability to control the electronic and magnetic properties ofnanostructures made from precise arrangements of atoms and molecules on a surface, and explore their potential application as devices for future nanoscale computing and data storage. These nanostructures will be imaged, positioned, and probed with atomic resolution by employing a low-temperature scanning tunneling microscope (STM). A key emphasis is to extend the ability to manipulate the quantum states of individual spins by using electron spin resonance (ESR), and employ these spins as sensors and as quantum bits that can be controllably coupled together. The technique of ESR in STM was developed by IBM in 2015 and has proved capable of sensing and controlling atomic spins and coupled-spin structures. In this technique, the spin resonance is driven and sensed electrically. This research is exploratory in nature and directed toward gaining fundamental understanding of underlying scientific questions as well as for proof-of-concept demonstrations for devices. The goals fall into four categories:1.Improved spin resonant centers. Identify new atomic-scale spin-resonant centers that are accessible electronically, with the goals of improved coherence, faster quantum control, and broader applicability. Develop methods to drive multiple spins in the STM.2.Spin resonance of molecular spins. Demonstrate spin resonance of a magnetic molecule or radical on a surface. Reposition molecular spins as a unit to place them in designed interaction with each other. Identify a molecule whose structure provides controlled isolation from the conducting substrate, so ESR does not require a thin insulating film. 3.Scanning magnetic sensor. Transfer a spin-resonant molecule to a spin-polarized microscope tipto create a sensitive and versatile magnetic field sensor based on spin resonance. Employ this probe tip for imaging the 3-dimensional magnetic fields of magnetic molecules and nanostructures, and infer spin locations with atomic resolution.4.Designed arrays of quantum spins. Demonstrate quantum simulation by using multi-spin systems. Employ the scanning magnetic sensor to explore novel quantum materials such as finite spin liquids, magnetic frustration, control of entanglement, and spin transport in insulating lattices.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 05, 2021
- Source ID
- N000142112467
Entities
People
- Christopher P Lutz
Organizations
- International Business Machines Corporation (Armonk, NY)
- Office of Naval Research
- United States Navy