Interlayer excitons move at low temperatures, enhancing quantum stability

Researchers at the Lawrence Berkeley National Laboratory have made an exciting discovery about materials known as transition metal dichalcogenides (TMDs). These materials, when stacked in specific ways, create a moiré pattern. This pattern was previously thought to be stationary, but the team found that it is actually dynamic, moving continuously even in low temperatures. The study focused on interlayer excitons, which are pairs of electrons and holes created when the TMDs are stacked. Traditionally, it was believed these excitons would become trapped in the moiré valleys. However, the researchers observed that they could still move within this "seascape" of potential energy. Using advanced imaging techniques, the team discovered that a low-temperature quasiparticle called a phason appears to assist in the movement of excitons. Rossi, one of the lead researchers, described the excitons as "surfing" the moiré pattern, with the phason acting like a surfboard. The findings could have implications for quantum technology, particularly in strengthening the stability of qubits and sensors by reducing decoherence. This research is part of broader efforts to develop quantum information systems, with various scientists working across multiple disciplines to push the boundaries of technology. Moving forward, the team plans to explore more about phasons and their role in other materials. They have also expressed interest in investigating superconductivity in related structures, indicating promising directions for future research.