Electronics keep asking for more speed at lower energy, and silicon is running out of room. One alternative is to compute with the spin of electrons rather than only their charge. The catch is that spin information normally fades in a flash unless a material is chilled to extreme temperatures. On November 9, 2026, the Hong Kong University of Science and Technology (HKUST) announced a perovskite design that holds spin polarization about 300 times longer at room temperature.
The study, led by Prof. Lu Haipeng of HKUST’s Department of Chemistry, appears in Nature Photonics under the title “Perovskite chiral multiple quantum wells with extended spin lifetime via efficient spin cascade.”
Why spin is hard to keep
According to HKUST, optoelectronic devices keep running into the twin goals of faster processing and lower energy use, which is why researchers are exploring spin-based approaches. The obstacle is decoherence: at room temperature, spin states relax quickly, so long-lived spin polarization has generally been achievable only at ultralow temperatures.
That gap between lab-cold physics and everyday operating conditions is what the new work tries to narrow.
A staircase of quantum wells
The team built what it calls a chiral multiple quantum-well system. Using a two-step, seed-assisted crystallization method, the researchers grew well-oriented quantum wells of different widths with continuous intrinsic chirality, spanning two-dimensional (n=1), quasi-two-dimensional (n=2, 3, 4 and up) and three-dimensional perovskite phases.
The wells are structurally coupled, which creates an energy gradient and a fully chiral environment. That produces a series of intermediate spin-polarized states, so spin can step from one chiral well to the next, a process the team calls a spin cascade. HKUST says this reduces spin losses at interfaces and suppresses spin relaxation inside the bulk phases. The institution’s figure caption adds that the design mitigates excess-energy-related Rashba splitting at interfaces and spin dephasing in the bulk.
The numbers
- Spin polarization persists for roughly 5 nanoseconds at room temperature, about 300 times longer than in conventional chiral single quantum-well systems, per HKUST.
- The materials emit circularly polarized luminescence with a dissymmetry factor of up to 1.4 x 10^-2.
- Spin-dependent charge transport shows a polarization degree above 80%.
Five nanoseconds is short by everyday standards, but in spin physics the relevant comparison is with how fast spin normally disappears in these materials at room temperature.
Proof-of-concept uses
The team demonstrated two early applications: X-ray-triggered dissymmetric photopolymerization, and high-performance circularly polarized light detection. HKUST says these point toward asymmetric photocatalysis and advanced optical sensing, where distinguishing left- from right-handed light or molecules matters.
What it means
This is basic research, and the release does not describe a device or a commercialization timeline. Its value is a design principle: rather than fighting spin loss in a single sharp interface, graded, chiral layers can hand spin along in small steps. Prof. Lu described it as a promising platform for spin accumulation and for chiroptical and spintronic devices.
Perovskites are already familiar from solar cells and light emitters, so a route to controllable spin in the same family of materials could widen what they are used for. How well the effect scales, survives manufacturing and works in actual devices are open questions the researchers will need to answer.
The takeaway
Spin electronics has been held back by a temperature problem. HKUST’s cascade approach shows that material architecture, not only cooling, can extend spin lifetimes at room temperature. It is an early step, but a concrete one, for quantum-adjacent technology that does not need a cryostat to be studied.