It has been 37 years since scientists first demonstrated the ability to move single atoms, suggesting the possibility of designing materials atom by atom. Current techniques allow researchers to move individual atoms to impart exotic quantum properties, yet they are limited to two-dimensional movements on surfaces and often require painstakingly slow processes in high vacuum, ultracold lab conditions. Now, a team from MIT and the Department of Energy's Oak Ridge National Laboratory has developed a method to precisely move tens of thousands of individual atoms within a material in minutes at room temperature. This approach utilizes a set of algorithms to direct an electron beam to specific locations in the material, scanning the beam to drive atomic motions. MIT Research Scientist Julian Klein states, "The results demonstrate the ability to deterministically move atoms repeatedly within a material's 3D atomic lattice."
This research has been published in a Nature paper, detailing how over 40,000 quantum defects were created in a crystalline semiconductor material. The method provides a new way to study quantum behavior in materials and could lead to advancements in systems leveraging quantum defects, such as quantum computers, dense magnetic memory, and atomic-scale logic devices.
The inspiration for this work stems from IBM's landmark demonstration in 1989, where researchers arranged 35 atoms on a chilled crystal surface using a scanning tunneling microscope, marking a milestone in atomic positioning. However, traditional methods have been limited to surface operations and often require extensive time.
The MIT team's novel technique employs high-performance microscopes and sophisticated algorithms to precisely control the electron beam's movement over target atoms with a precision of a few picometers. This method pushes entire columns of atoms to new locations, creating atom-sized vacancies that are projected to confer exotic quantum properties to the crystal. In experiments, they created over 40,000 defects in about 40 minutes, demonstrating the scalability of their approach.
Klein adds, "Moving atoms within solids enables the creation of quantum properties in materials that are stable in the air outside of vacuum conditions. This approach is also scalable to many atomic manipulations, allowing for the creation of artificial structures."
Thus, this research lays the foundation for a new class of programmable matter, potentially aiding the development of stable quantum devices. Researchers are excited to explore the physical phenomena involving large numbers of atoms arranged in specific configurations, phenomena that cannot be achieved through self-assembly.
Blogger's Review: The breakthrough in this technology lies not only in the speed and precision of atomic movement but also in its scalability and potential applications in real-world environments, signaling significant advancements in quantum computing and materials science. By creating materials with specific quantum properties, scientists will be able to delve deeper into the boundaries of quantum physics, propelling the frontiers of technology.