Chemical tuning of electronic and transport properties of the Bi–Se–Te family of topological insulators

Doyle, Maxwell [Iowa State University; Division of Materials Science and Engineering]; Schrunk, Benjamin [Division of Materials Science and Engineering]; Schlagel, D L [Division of Materials Science and Engineering]; Lograsso, Thomas A [Division of Materials Science and Engineering]; Kaminski, Adam [Iowa State University; Division of Materials Science and Engineering] (ORCID:0000000211707875)

doi:10.1088/1361-648x/ae99bf

DOE OSTI · 3607609

Chemical tuning of electronic and transport properties of the Bi–Se–Te family of topological insulators

Doyle, Maxwell [Iowa State University; Division of Materials Science and Engineering]·Schrunk, Benjamin [Division of Materials Science and Engineering]·Schlagel, D L [Division of Materials Science and Engineering]·Lograsso, Thomas A [Division of Materials Science and Engineering]·Kaminski, Adam [Iowa State University; Division of Materials Science and Engineering] (ORCID:0000000211707875)

View original source ↗Read source document ↗Export metadata ↓

Abstract

The source did not provide an abstract. Follow the original record for more information.

Keep this discovery

BibTeX RIS

Doyle, Maxwell [Iowa State University; Division of Materials Science and Engineering], Schrunk, Benjamin [Division of Materials Science and Engineering], Schlagel, D L [Division of Materials Science and Engineering], Lograsso, Thomas A [Division of Materials Science and Engineering], Kaminski, Adam [Iowa State University; Division of Materials Science and Engineering] (ORCID:0000000211707875). 2026-09-01. Chemical tuning of electronic and transport properties of the Bi–Se–Te family of topological insulators. https://doi.org/10.1088/1361-648x/ae99bf

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2025

A topological superconductor tuned by electronic correlations

A topological superconductor, characterized by either a chiral order parameter or a topological surface state in proximity to bulk superconductivity, is foundational to topological quantum computing. A key open challenge is whether electron-electron interactions can tune such topological superconducting phases. Here, we provide experimental signatures of a unique topological superconducting phase in competition with electronic correlations in 10-unit-cell thick FeTe x Se 1-x films grown on SrTiO 3 substrates. When the Te content x exceeds 0.7, we observe a topological transition marked by the emergence of a superconducting surface state. Near the FeTe limit, the system undergoes another transition where the surface state disappears, and superconductivity is suppressed. Theory suggests that electron-electron interactions in the odd-parity xy− band drives this second topological transition. The flattening and eventual decoherence of d xy -derived bands track the superconducting dome, linking correlation effects directly to superconducting coherent transport. Our work establishes many-body electronic correlations as a sensitive knob for tuning topology and superconductivity, offering a pathway to engineer new topological phases in correlated materials.

36 MATERIALS SCIENCE↗

DOE OSTI2024

Prediction of BiS2-type pnictogen dichalcogenide monolayers for optoelectronics

Abstract In this work, we introduce a 2D materials family with chemical formula MX 2 (M={As, Sb, Bi} and X={S, Se, Te}) having a rectangular 2D lattice. This materials family has been predicted by systematic ab-initio structure search calculations in two dimensions. Using density-functional theory and many-body perturbation theory, we study the structural, vibrational, electronic, optical, and excitonic properties of the predicted MX 2 family. Our calculations reveal that the predicted SbX 2 and BiX 2 monolayers are stable while the AsX 2 layers exhibit an in-plane ferroelectric instability. All materials display strong excitonic effects and good optical absorption within the infrared-to-visible range. Hence, these monolayers can harvest solar energy and serve in optoelectronics applications. Furthermore, our results indicate that exfoliation of the predicted MX 2 monolayers from their bulk counterparts is experimentally viable.

Materials Science↗

DOE OSTI2025

Interwoven magnetic kagome metal overcomes geometric frustration

Magnetic kagome materials provide a platform for exploring magneto-transport phenomena, symmetry breaking and charge ordering driven by the intricate interplay among electronic structure, topology and magnetism. Yet geometric frustration in conventional kagome magnets limits their tunability. Here we propose a design strategy for interweaving quasi-one-dimensional magnetic Tb zigzag chains with non-magnetic Ti-based kagome bilayers in TbTi 3 Bi 4 . Comprehensive spectroscopic analyses reveal coexisting elliptical-spiral magnetic and spin-density-wave orders accompanied by a large ~90 meV band-folding gap. The combined magnetic and electronic state leads to a giant anomalous Hall conductivity of 10 5 Ω −1 cm −1 , which exceeds that observed in frustrated kagome analogues. These results establish TbTi 3 Bi 4 as a model system of magnetic kagome metals with strong electron–magnetism interactions and underscore the necessity of interweaving designed magnetic and charge layers separately to achieve tunable transport properties. This design strategy will enable the discovery of emergent quantum states and next-generation electronic materials.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗