Researchers report robust isolated quantum spins established on a magnetic substrate
Establishing robust isolated spins on solid surfaces is crucial for fabricating quantum bits or qubits, sensors, and single-atom catalysts. An isolated spin is a single spin that is shielded from external interactions. Since isolated spins can maintain their state for long periods, they are ideal for use as qubits, the basic units of quantum computation, and for ultrafast spintronic memory. Significant research has been dedicated to identifying materials capable of producing a stable isolated quantum spin and candidates include single atoms of transition metals such as copper (Cu) in the Cu-phthalocyanine molecule (CuPc), molecular magnets, nitrogen-vacancy centers in diamonds, and two-dimensional layered materials.
One way to detect an isolated spin is by observing a zero-bias peak (ZBP) in the electrical conductance of, for example, a noble metal substrate containing a CuPc molecule. The ZBP results from the interaction between conduction electrons on the substrate and the isolated spin. So far, the engineering of these ZBPs has been mainly limited to noble metal surfaces, such as gold and silver. These surfaces are rich in conduction electrons, which, while useful for ZBP, can also scatter a spin and flip its state, causing it to disturb the intrinsic spin state. This makes them unsuitable for use as qubits. As a solution, researchers have turned to insulating films, which lack conduction electrons and can host more stable spins. Now, researchers from Chiba University in Japan, led by Associate Professor Toyo Kazu Yamada, demonstrated isolated spins on an insulating solid surface laid over a magnetic substrate.
Source: https://www.spintronics-info.com/researchers-report-robust-isolated-quantum-spins-established-magnetic-substrate
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