Modular Design with 2D Topological-Insulator Building Blocks: Optimized Synthesis and Crystal Growth and Crystal and Electronic Structures of BixTeI (x = 2, 3)
Source abstract
Abstract
Structural engineering of topological bulk materials is systematically explored with regard to the incorporation of the buckled bismuth layer [Bi 2 ], which is a 2D topological insulator per se, into the layered BiTeI host structure. The previously known bismuth telluride iodides, BiTeI and Bi 2 TeI, offer physical properties relevant for spintronics. Herewith a new cousin, Bi 3 TeI (sp.gr. R 3 m, a = 440.12(2) pm, c = 3223.1(2) pm), joins the ranks and expands this structural family. Bi 3 TeI = [Bi 2 ][BiTeI] represents a stack with strictly alternating building blocks. Conditions for reproducible synthesis and crystal-growth of Bi 2 TeI and Bi 3 TeI are ascertained, thus yielding platelet-like crystals on the millimeter size scale and enabling direct measurements. The crystal structures of Bi 2 TeI and Bi 3 TeI are examined by X-ray diffraction and electron microscopy. DFT calculations predict metallic properties of Bi 3 TeI and an unconventional surface state residing on various surface terminations. This state emerges as a result of complex hybridization of atomic states due to their strong intermixing. Our study does not support the existence of new stacking variants Bi x TeI with x > 3; instead, it indicates a possible homogeneity range of Bi 3 TeI. The series BiTeI–Bi 2 TeI–Bi 3 TeI illustrates the influence of structural modifications on topological properties.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Topological Materials and Phenomena · 2D Materials and Applications · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry and Food Chemistry, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, Germany
Department of Applied Chemistry, Brandenburgische Technische Universität (BTU) Cottbus−Senftenberg, Universitätsplatz 1, 01968 Senftenberg, Germany
Tomsk State University, pr. Lenina, 36, 634050 Tomsk, Russia
St. Petersburg State University, Universitetskaya nab., 7/9, 199034 St. Petersburg, Russia
SuperOx, Odintsovskii District, 143082 Moscow Region, Russia
Department of Physics, Humboldt Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal, 4, 20018 San Sebastián/Donostia, Basque Country, Spain
Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
Centro de Física de Materiales CFM−MPC, Centro Mixto CSIC−UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
Funding
Ministerio de Ciencia e Innovación · Deutsche Forschungsgemeinschaft · ERA Chemistry · Basque Departamento de Educacion, UPV/EHU · Saint Petersburg State University project · Academic D.I. Mendeleev Fund Program, Tomsk State University
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