In a breakthrough that could pave the way for new types of electronic devices, scientists have demonstrated the first-ever electrical manipulation of the spins of electrons in a two-dimensional material.
The discovery, reported in the journal Nature, was made by a team of researchers led by Professor Stephen Park at the University of California, Berkeley. The team used a material called molybdenum disulfide (MoS2), which is a two-dimensional semiconductor that is only a few atoms thick.
In conventional electronics, the flow of electrons is controlled by their charge. However, in spintronics, the spins of electrons are also used to encode information. This could potentially lead to new types of devices that are faster, more energy-efficient, and more secure than conventional electronics.
The Berkeley team was able to electrically manipulate the spins of electrons in MoS2 by using a technique called spin-orbit coupling. Spin-orbit coupling is a relativistic effect that occurs when the spin of an electron interacts with the electric field of the atom's nucleus.
By carefully controlling the electric field in the MoS2, the researchers were able to induce a spin-flip in the electrons, which means that the electrons' spins were reversed. This was the first time that electrical manipulation of electron spins had been demonstrated in a two-dimensional material.
The discovery is a significant breakthrough in the field of spintronics. It could lead to the development of new types of electronic devices that are based on the spins of electrons rather than their charge. These devices could be used for a variety of applications, such as data storage, computing, and sensing.
"This is a major milestone in the development of spintronics," said Professor Park. "We have shown that it is possible to electrically manipulate the spins of electrons in a two-dimensional material. This opens up new possibilities for the development of spintronic devices."
The research was funded by the National Science Foundation and the U.S. Department of Energy.
