# HKUST builds perovskite chiral quantum wells with ~5 ns spin lifetime at room temperature

- Published: 2026-11-09 03:32 UTC
- Section: Machines & Making › Electronics
- Tags: perovskite chiral multiple quantum wells, spin coherence lifetime, spin cascade, room temperature spin polarization, circularly polarized luminescence, circularly polarized light photodetector, HKUST perovskite, Nature Photonics, halide perovskites spintronics
- URL: https://realtech.media/news/rt-8def18f8d1c630eeacf51a04_hkust_builds_perovskite/

**Researchers at HKUST made oriented perovskite multiple quantum wells in which spin coherence lasts about 5 ns at room temperature, shown in laboratory devices.**

![HKUST builds perovskite chiral quantum wells with ~5 ns spin lifetime at room temperature](https://realtech.media/media/2026/11/f23432b44e061388.png)
*nature.com*

A team led by Prof. Lu Haipeng of the Department of Chemistry at the Hong Kong University of Science and Technology (HKUST) has built oriented perovskite chiral multiple quantum wells with a spin coherence lifetime of about 5 ns at room temperature, according to a paper on nature.com [1]. The team reports that spin polarization persists approximately 300 times longer at room temperature. The work was published in Nature Photonics under the title "Perovskite chiral multiple quantum wells with extended spin lifetime via efficient spin cascade" [1].

## Spin cascade in coupled quantum wells

The use of halide perovskites in chiroptical and spintronic devices depends on how long spin coherence lasts. Spin injection from chiral single quantum wells into achiral semiconductors has already been demonstrated, but device-level spin polarization stays limited by rapid spin losses at interfaces and in the bulk [1].

To address this, the team used a two-step seed-assisted crystallization method. It produced well-oriented quantum wells of different widths with continuous intrinsic chirality across the two-dimensional (n=1), quasi-two-dimensional (n=2, 3, 4, …) and three-dimensional (n=∞) perovskite phases. The average circular dichroism dissymmetry factor is 1.5 × 10⁻² [1].

The wells are spatially coupled, and their energy changes slowly from one to the next. This creates consecutive intermediate spin-polarized states, which the authors call a spin cascade. According to the authors, this reduces interfacial spin losses linked to excess energy and Rashba splitting, and suppresses spin dephasing in the bulk phases [1].

## Device-level results

The long-lived spin coherence produced circularly polarized luminescence with a luminescence dissymmetry factor |glum| of 1.4 × 10⁻². Spin-dependent charge transport reached a polarization degree of over 80% [1].

The authors used these properties in two demonstrations. One is X-ray-triggered dissymmetric photopolymerization. The other is circularly polarized light photodetectors, which the authors describe as high-performance [1].

All results come from laboratory samples and test devices. The authors say the approach opens the way to long-lived spin coherence in halide perovskites for chiroptical and spintronic devices [1].

## Sources

1. [nature.com](https://www.nature.com/articles/s41566-026-02027-6)
2. [hkust.edu.hk](https://hkust.edu.hk/news/hkust-develops-novel-perovskite-chiral-multiple-quantum-well-system)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-8def18f8d1c630eeacf51a04_hkust_builds_perovskite/