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Researchers have demonstrated a method to activate spin-forbidden dark excitons in WSe2 monolayers using a ferroelectric perovskite heterostructure, eliminating the need for bulky external magnetic fields. This electrically reconfigurable approach leverages the ferroelectric proximity effect to break rotational symmetry, offering a practical pathway for controlling spin and valley properties in future information processing devices. The breakthrough enables access to hidden electronic pathways that are more resilient to environmental noise, potentially advancing the scalability of spin-based technologies.

Source coveringQuantum Zeitgeist

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Zero Magnetic Field Brightens Hidden Signals in Novel Material

Quantum ZeitgeistJune 10, 20265 min read

Activating spin information in two-dimensional semiconductors has traditionally demanded bulky external magnets. Now, a heterostructure combining WSe2 with a ferroelectric perovskite brightens typically invisible, spin-forbidden dark excitons without any magnetic field. This electrically reconfigurable approach offers a new route towards controlling spin and valley properties for future devices.

Xinyun Wang and colleagues from National University of Singapore and Quantum Innovation Centre and Nanyang Technological University and National University of Singapore and Institute of Materials Research and Engineering have activated typically inaccessible ‘dark’ excitons in monolayer WSe2 without external magnetic fields. By using a ferroelectric hybrid perovskite heterostructure, they successfully broke the rotational symmetry of the WSe2, effectively ‘brightening’ these spin-forbidden dark excitons. The electrically reconfigurable approach, supported by a tight-binding model revealing an asymmetric intersublattice interaction and induced spin-orbit coupling, represents a key advancement towards practical spin exciton control and opens new avenues for information processing technologies. The technique…

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