Also called Bi₂Se₃, Bi₂Te₃, Sb₂Te₃, tetradymite topological insulators
The best-known topological insulators: insulating inside, but with surfaces carrying electrons whose spin is locked to their direction of motion and which resist being scattered backwards. Bi2Te3 has also been the standard thermoelectric in solid-state coolers for decades. Thinning these crystals to a few layers lets the two surfaces interact, which changes their topology.
They are coordination polyhedra. Only complete ones are drawn.
Three quintuple layers of Bi2Se3. Each is shifted by the same step in the same direction, so the pattern repeats only after three: c = 28.64 Å. Only van der Waals forces hold the quintuple layers together, so crystals cleave between them. Cell from Nakajima, Journal of Physics and Chemistry of Solids 24, 479 (1963); COD 9011965.
Readiness runs lab → prototype → pilot → deployed.
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The canonical three-dimensional strong topological insulators (Z2 = 1), with SOC-driven band inversion at Γ. DFT captures the topology but not always the gap size or the position of the Dirac point relative to the bulk valence band – GW matters for Bi2Te3. Thin films need slab models that include surface hybridisation and substrate-induced inversion asymmetry.
Carrier density is the constant enemy: use antimony alloying, compensation doping or gating to bring the Fermi level into the bulk gap before claiming surface transport. ARPES confirms the Dirac cone; in Bi2Se3, Raman modes near 72, 131 and 174 cm−1 track thickness.
Bi2Te3 is already a manufactured thermoelectric, though tellurium supply is limited and price-sensitive. For spintronics, sputtered topological insulator layers are being evaluated for spin–orbit torque MRAM, where integration temperature and interface quality are the issues.
The newest items tagged Bi2Se3, Bi2Te3, from the news feed updated 5 Oct 2026.
Bismuth telluride (Bi2Te3) is a prototypical V-VI semiconductor of interest for both thermoelectric and topological applications; however, phase-selective synthesis and thermal stability across the bismuth-telluride homologous series remain poorly understood. We report a facile and phosphine-free colloidal synthesis…
Floquet band engineering has been intensively studied for its potential to control material properties via laser driving. In particular, Floquet topological states have been measured on the surface of Bi2Se3. Nonetheless, the original prediction of Floquet topological bands in graphene remains unobserved, with works…
Conventional gate-stack scaling reduces dielectric thickness and increases permittivity while largely treating the position and electronic character of the gate-side screening boundary as fixed. As equivalent oxide thickness is reduced, however, finite interfacial responses can increasingly constrain gate control…
Over the past decades, two-dimensional crystals have attracted considerable interest as promising materials for electronic and optoelectronic applications. Among them, graphene analogs composed of heavy atoms occupy a particularly distinctive niche due to their enhanced spin-orbit interaction. Here,… [Phys. Rev.…
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