The team of Xiamen University successfully developed a topological spin solid-state light source chip

Professors Kang Junyong, Zhang Rong and Wu Yaping of the semiconductor research team of Xiamen University proposed a new principle of topological spin protection for orbital regulation, and for the first time grew a intrinsically stable and long-range ordered magnetic half-on (Meron) lattice at room temperature zero field, and successfully developed a topological spin solid-state light source chip (T-LED). On July 13, the relevant research results were published in Nature Electronics, which for the first time realized chiral transport from topological protection quasiparticles to fermions and even bosons, opening up a new path for quantum state manipulation and transmission.

Schematic diagram of the topological spin solid-state light source chip developed by the team. Photo courtesy of the research group

Manipulating the spin angular momentum of photons to achieve modulation of optical quantum states is a strategic frontier technology urgently needed in the fields of quantum technology, three-dimensional display, and biological imaging. Traditional methods often require the introduction of optical components such as polarizers and phase delay sheets to phase control the light source, which is not compatible with existing microelectronic technology, and is not conducive to the integration and miniaturization of information devices.

High-efficiency, miniaturized spin-polarized photon sources rely on the efficient manipulation and transport of spin quantum states. The conditions of traditional spin manipulation are harsh, requiring an applied magnetic field or low temperature environment, and low polarizability, poor stability, and easy interference from electromagnetic signals.

The team used the self-developed strong magnetic field molecular beam epitaxy device (HMF-MBE) to obtain the Meron lattice with application value for the first time, creatively applied the topological spin structure to semiconductor devices, successfully used topological protection to break through the dependence on external magnetic fields and low temperature conditions, and innovatively developed a topological spin solid-state light source chip. This achievement has achieved a new breakthrough in topological materials from theory to devices, and opened up a new field of cross-integration of optoelectronics and topological spintronics.

The original topological spin structure has the problems of small scale, dependence on low temperature and external magnetic field. Through theoretical simulation, the team predicted that the strong magnetic field in crystal growth can enhance and freeze the coupling of D, S, and P orbits, which is expected to break through the growth bottleneck of large-area topological spin structures and achieve the stability of room temperature and zero outer field.

Under the guidance of this spark, the team started research and development from the equipment side, independently designed and built HMF-MBE equipment, and finally successfully grew a large-scale, long-range ordered Meron lattice on a wide bandgap semiconductor substrate by optimizing the material system. The lattice has high stability in room temperature and no external magnetic field environment, which lays a solid foundation for the subsequent research and development of topological spin solid-state light source chips.

Topological spin structure is the carrier of high-density, high-throughput, low-power information devices in the future, and its application exploration in the field of semiconductor optoelectronics has not yet been carried out. At the same time, current research focuses on the effective manipulation of topological spin structures (such as track memory, Sgmin sub-logic gates, etc.) using light and spin currents. So “Can topological spin structures manipulate electrons and photons?” “This reverse process remains an unsolved mystery.

After in-depth research of theory and experiment, the team found that when electrons are injected into the Meron lattice, their transport orbits can be effectively regulated, resulting in spin polarization. On this basis, the team further injected the spin-polarized current into the quantum well, completed the chiral transfer from topology-protected quasiparticles to electrons to photons, and realized efficient spin light emission. The new topological spin solid-state light source chip is expected to meet the development needs of quantum information and other technologies in the future. (Source: Wen Caifei, China Science News)

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