Breakthrough Tracker record
Hidden spin-valley locking stabilized room-temperature spin polarization
Time-resolved circular-dichroism measurements found optically generated spin-polarized carriers lasting 686 picoseconds in a lead iodide perovskite and 4.7 nanoseconds in its lead-free tin analogue at room temperature, without an external magnetic field. First-principles calculations support hidden spin valleys as part of the mechanism.
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- Stable ID
physics-hidden-spin-valley-locking-2d-perovskites-2026- Revision
physics-hidden-spin-valley-locking-2d-perovskites-2026.v1- Field
- Physics · Spintronics and two-dimensional materials
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed publication
- Last checked
AI role
No AI role was disclosed in the inspected article.
Record details
- Problem or result
- Room-temperature spin stabilization through hidden spin-valley locking in inversion-symmetric semiconductors
- Authors
- Rayan Chakraborty, Yifan Dong, Jacob L. Shelton, Kelsey Garden, Leo Romanetz, Matthew P. Hautzinger, Matthew C. Beard, Volker Blum and David B. Mitzi
- Institutions
- Duke University; National Laboratory of the Rockies; University of California, Riverside; University of Colorado Boulder
- Result date
- Published July 27, 2026
Why it matters
Strong spin dephasing at higher temperatures limits semiconductor spin control. The reported nanosecond-scale lifetime in a lead-free two-dimensional material broadens the experimentally demonstrated design space for room-temperature spin-optoelectronics.
Limits
This is a materials and spectroscopy result, not a functioning spintronic device. The mechanism combines experiment with first-principles interpretation, and durability, integration, switching performance and manufacturing scale were not demonstrated.
Sources
- Primary: Chakraborty and colleagues, Hidden spin-valley locking stabilizes nanosecond spin polarization in 2D perovskites
- Open data: Spectroscopic data repository for the study
Correction and revision history
- 2026-07-29 — Added after reviewing the peer-reviewed article, room-temperature lifetime measurements, computational interpretation and open-data statement.
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