Quantum breakthrough could lead to sustainable chiral spintronics

A team of physicists led by Lia Krusin Erlbaum of the City University of New York has used hydrogen cations (H+) to create a relativity theory for magnetic Weyl semimetals, topological materials in which electrons mimic massless particles called Weyl fermions. We have developed a new technique for manipulating the electronic band structure. . These particles are distinguished by their chirality or “handedness” related to their rotation and momentum.

Researchers reveal the intriguing ability of the magnetic material MnSb₂Te₄ to “tune” and enhance the chirality of electron transport by introducing hydrogen ions, reshaping the energy landscape on demand, called Weyl nodes, within the material. I made it. This discovery could open a wide range of new quantum device platforms to exploit emergent topological states for novel chiral nanospintronics and fault-tolerant quantum computing. The study, titled “Transport chirality generated by tunable tilting of Weyl nodes in van der Waals topological magnets,” is published in the journal Nature Communications.

Tuning of the Weyl nodes with H+ repairs the (Mn-Te) coupling failure in the system and reduces the inter-node scattering. The process, which the City College team is testing at the Kursin Institute using angle-resolved electrotransport, moves charges differently when the in-plane magnetic field rotates clockwise or counterclockwise, producing the desired low current consumption. will be done. The reformed Weyl state is characterized by a double Curie temperature and a strong angular transport chirality synchronized with a rare magnetic field asymmetric longitudinal resistance. It is a low-field tunable “chiral switch” rooted in topological Berry curvature, chiral anomalies, and hydrogen interactions. Mediated type of Weyl clause.

“The main advance of this research is that we have expanded the scope of engineered topological quantum materials beyond natural blueprints. Tunable topological band structures facilitated by hydrogen or other light elements via defect-related pathways. provides an amazing macroscopic view of the topology. “It expands the availability of accessible platforms for exploring and exploiting cal phases,” which paves the way for potentially destructive chirality-based implementations in future quantum devices. Kursin Elbaum said. Professor in the CCNY Science Department.

Research in the Krusin lab focuses on exploring new quantum phenomena, such as the quantum anomalous Hall (QAH) effect. The quantum anomalous Hall (QAH) effect describes an axion-state phenomenon characterized by insulators, 2D superconductivity, and quantized heat transport that conduct dissipation-free current in discrete channels at the surface. Industrialization could lead to advances in energy-efficient technology. Krusin-Elbaum and his team said the technology they demonstrated is very general and could advance the potential of intrinsic topological magnets to ultimately transform quantum electronics in the future.

The CCNY-based Harlem Center for Quantum Materials is a research partner. We strive to solve fundamental problems in new functional material systems of scientific and technological importance. This research is supported in part by the National Science Foundation.