Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3

Izadi S, Bhattacharya A, Salloum S, Han JW, Schnatmann L, Wolff U, Perez N, Bendt G, Ennen I, Hütten A, Nielsch K, et al. (2023)
Small 19(11): e2204850.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Izadi, SepidehUniBi; Bhattacharya, Ahana; Salloum, Sarah; Han, Jeong Woo; Schnatmann, LauritzUniBi; Wolff, Ulrike; Perez, Nicolas; Bendt, Georg; Ennen, IngaUniBi; Hütten, AndreasUniBi; Nielsch, Kornelius; Schulz, Stephan
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Abstract / Bemerkung
Three-dimensional topological insulators (3D TI) exhibit conventional parabolic bulk bands and protected Dirac surface states. A thorough investigation of the different transport channels provided by the bulk and surface carriers using macroscopic samples may provide a path toward accessing superior surface transport properties. Bi2 Te3 materials make promising 3D TI models; however, due to their complicated defect chemistry, these materials have a high number of charge carriers in the bulk that dominate the transport, even as nanograined structures. To partially control the bulk charge carrier density, herein the synthesis of Te-enriched Bi2 Te3 nanoparticles is reported. The resulting nanoparticles are compacted into nanograined pellets of varying porosity to tailor the surface-to-volume ratio, thereby emphasizing the surface transport channels. The nanograined pellets are characterized by a combination of resistivity, Hall- and magneto-conductance measurements together with (THz) time-domain reflectivity measurements. Using the Hikami-Larkin-Nagaoka (HLN) model, a characteristic coherence length of 200 nm is reported that is considerably larger than the diameter of the nanograins. The different contributions from the bulk and surface carriers are disentangled by THz spectroscopy, thus emphasizing the dominant role of the surface carriers. The results strongly suggest that the surface transport carriers have overcome the hindrance imposed by nanoparticle boundaries. © 2023 The Authors. Small published by Wiley-VCH GmbH.
Erscheinungsjahr
2023
Zeitschriftentitel
Small
Band
19
Ausgabe
11
Art.-Nr.
e2204850
eISSN
1613-6829
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Open-Access-Publikationskosten wurden durch die Universität Bielefeld im Rahmen des DEAL-Vertrags gefördert.
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https://pub.uni-bielefeld.de/record/2968382

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Izadi S, Bhattacharya A, Salloum S, et al. Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3. Small . 2023;19(11): e2204850.
Izadi, S., Bhattacharya, A., Salloum, S., Han, J. W., Schnatmann, L., Wolff, U., Perez, N., et al. (2023). Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3. Small , 19(11), e2204850. https://doi.org/10.1002/smll.202204850
Izadi, Sepideh, Bhattacharya, Ahana, Salloum, Sarah, Han, Jeong Woo, Schnatmann, Lauritz, Wolff, Ulrike, Perez, Nicolas, et al. 2023. “Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3”. Small 19 (11): e2204850.
Izadi, S., Bhattacharya, A., Salloum, S., Han, J. W., Schnatmann, L., Wolff, U., Perez, N., Bendt, G., Ennen, I., Hütten, A., et al. (2023). Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3. Small 19:e2204850.
Izadi, S., et al., 2023. Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3. Small , 19(11): e2204850.
S. Izadi, et al., “Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3”, Small , vol. 19, 2023, : e2204850.
Izadi, S., Bhattacharya, A., Salloum, S., Han, J.W., Schnatmann, L., Wolff, U., Perez, N., Bendt, G., Ennen, I., Hütten, A., Nielsch, K., Schulz, S., Mittendorff, M., Schierning, G.: Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3. Small . 19, : e2204850 (2023).
Izadi, Sepideh, Bhattacharya, Ahana, Salloum, Sarah, Han, Jeong Woo, Schnatmann, Lauritz, Wolff, Ulrike, Perez, Nicolas, Bendt, Georg, Ennen, Inga, Hütten, Andreas, Nielsch, Kornelius, Schulz, Stephan, Mittendorff, Martin, and Schierning, Gabi. “Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2 Te3”. Small 19.11 (2023): e2204850.
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