Researchers Induced Valley Splitting in Heterobilayers
New strain-engineering methods allow for magnetic-like effects without external fields.
Updated on Oct. 5, 2026 in Quantum Computing
Researchers have demonstrated a valley Zeeman-like splitting of nearly 6.5 meV in WSe2-MoSe2 heterobilayers. This experimental research-stage finding was achieved by using heterostrain to generate an 8T pseudomagnetic field.
Why it matters
This research provides a pathway for developing valleytronic applications—devices that use the valley degree of freedom in electrons—without the need for bulky external magnetic field equipment. It represents a shift toward using internal strain engineering to control quantum states at the nanoscale.
The experiment achieved a 6.5 meV valley Zeeman-like splitting in WSe2-MoSe2 heterobilayers, driven by an 8T pseudomagnetic field. This performance was enabled by applying heterostrain, which breaks the three-fold rotational symmetry inherent in these layered structures.
The players
WSe2-MoSe2 heterobilayers
A specific class of van der Waals heterostructures made from transition metal dichalcogenides used for studying quantum electronic properties.
The details
The researchers applied heterostrain—a mechanical deformation that varies across the layers—to WSe2-MoSe2 heterobilayers, a stacked material consisting of two-dimensional semiconductors. This strain broke the three-fold rotational symmetry of the atomic lattice, effectively generating an 8T pseudomagnetic field that acted on the electrons within the structure. This field forced the valley splitting, resulting in elliptically polarized light emission when excited by a linearly polarized laser.
Timeline
October 5, 2026: The research findings were published.
The Tech Race
This development moves the field of valleytronics closer to practical, chip-scale applications by eliminating the need for external magnets. It follows a multi-year effort to use 2D material heterostructures to control electron states through precise structural deformation.
This research is in the laboratory stage and is not currently applicable to consumer or industrial devices. It establishes a technical foundation for future engineers to design solid-state, field-free quantum logic and communication hardware.
The takeaway
The study confirms that mechanical strain can replicate the effects of intense magnetic fields in 2D heterostructures. Watch for follow-up research investigating if these splitting magnitudes can be maintained or increased at room temperature in future prototypes.
Further reading
Learn more about the latest innovations in Quantum Computing.
More information
Review the technical findings in the Nature peer-reviewed research article.
