Magnetotransport and high-resolution angle-resolved photoelectron spectroscopy studies of palladium-doped Bi2Te3

Shailja Sharma; Shiv Kumar; Girish C. Tewari; Girish Sharma; Eike F. Schwier; Kenya Shimada; A. Taraphder; C. S. Yadav

doi:10.1103/PhysRevB.105.115120

Magnetotransport and high-resolution angle-resolved photoelectron spectroscopy studies of palladium-doped Bi₂Te₃

Shailja Sharma, Shiv Kumar, Girish C. Tewari, Girish Sharma, Eike F. Schwier, Kenya Shimada, A. Taraphder, C. S. Yadav^*

^*Corresponding author for this work

Department of Chemistry and Materials Science

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Abstract

We have performed magnetotransport and high-resolution angle-resolved photoelectron spectroscopy (ARPES) measurements on topological insulator PdxBi2Te3(0=x=0.20) single crystals. We have observed unusually high values of magnetoresistance (~1500%) and mobility (~93000cm2V-1s-1) at low temperatures for pristine Bi2Te3 that decrease upon Pd doping. Shubnikov-de Haas (SdH) oscillations were detected for x=0.05, 0.10, confirming the presence of two-dimensional topological surface states (TSSs) for these samples. Hall measurement shows the crossover from n-type charge carriers in pristine Bi2Te3 to p-type charge carriers upon Pd doping. The ARPES measurements show that the conduction band crosses the Fermi level for pristine Bi2Te3, and the Dirac point of the TSSs and bulk-derived valence bands indicated a shift to lower binding energy upon Pd doping in a rigid-band-like way up to x~0.10. Based on the comparison of the parameters obtained from the SdH and ARPES measurements, the reduction in the kF value in the magnetotransport measurements is likely due to the band bending induced by the Schottky barrier.

Original language	English
Article number	115120
Number of pages	9
Journal	Physical Review B
Volume	105
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevB.105.115120
Publication status	Published - 15 Mar 2022
MoE publication type	A1 Journal article-refereed

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@article{540d0cc7a4d34a298ec962ab05a05329,

title = "Magnetotransport and high-resolution angle-resolved photoelectron spectroscopy studies of palladium-doped Bi2Te3",

abstract = "We have performed magnetotransport and high-resolution angle-resolved photoelectron spectroscopy (ARPES) measurements on topological insulator PdxBi2Te3(0=x=0.20) single crystals. We have observed unusually high values of magnetoresistance (~1500%) and mobility (~93000cm2V-1s-1) at low temperatures for pristine Bi2Te3 that decrease upon Pd doping. Shubnikov-de Haas (SdH) oscillations were detected for x=0.05, 0.10, confirming the presence of two-dimensional topological surface states (TSSs) for these samples. Hall measurement shows the crossover from n-type charge carriers in pristine Bi2Te3 to p-type charge carriers upon Pd doping. The ARPES measurements show that the conduction band crosses the Fermi level for pristine Bi2Te3, and the Dirac point of the TSSs and bulk-derived valence bands indicated a shift to lower binding energy upon Pd doping in a rigid-band-like way up to x~0.10. Based on the comparison of the parameters obtained from the SdH and ARPES measurements, the reduction in the kF value in the magnetotransport measurements is likely due to the band bending induced by the Schottky barrier. ",

author = "Shailja Sharma and Shiv Kumar and Tewari, {Girish C.} and Girish Sharma and Schwier, {Eike F.} and Kenya Shimada and A. Taraphder and Yadav, {C. S.}",

note = "Funding Information: S.S. acknowledges IIT Mandi for an HTRA fellowship. C.S.Y. acknowledges the experimental facility at AMRC, IIT Mandi. G.S. acknowledges funding from SERB Grant No. SRG/2020/000134. The ARPES measurements were performed with the approval of the Proposal Assessing Committee of the Hiroshima Synchrotron Radiation Center Hiroshima University, Japan (Proposal No. 19BU009). We thank N-BARD, Hiroshima University for supplying the liquid helium. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

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doi = "10.1103/PhysRevB.105.115120",

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AU - Sharma, Shailja

AU - Kumar, Shiv

AU - Tewari, Girish C.

AU - Sharma, Girish

AU - Schwier, Eike F.

AU - Shimada, Kenya

AU - Taraphder, A.

AU - Yadav, C. S.

N1 - Funding Information: S.S. acknowledges IIT Mandi for an HTRA fellowship. C.S.Y. acknowledges the experimental facility at AMRC, IIT Mandi. G.S. acknowledges funding from SERB Grant No. SRG/2020/000134. The ARPES measurements were performed with the approval of the Proposal Assessing Committee of the Hiroshima Synchrotron Radiation Center Hiroshima University, Japan (Proposal No. 19BU009). We thank N-BARD, Hiroshima University for supplying the liquid helium. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/3/15

Y1 - 2022/3/15

N2 - We have performed magnetotransport and high-resolution angle-resolved photoelectron spectroscopy (ARPES) measurements on topological insulator PdxBi2Te3(0=x=0.20) single crystals. We have observed unusually high values of magnetoresistance (~1500%) and mobility (~93000cm2V-1s-1) at low temperatures for pristine Bi2Te3 that decrease upon Pd doping. Shubnikov-de Haas (SdH) oscillations were detected for x=0.05, 0.10, confirming the presence of two-dimensional topological surface states (TSSs) for these samples. Hall measurement shows the crossover from n-type charge carriers in pristine Bi2Te3 to p-type charge carriers upon Pd doping. The ARPES measurements show that the conduction band crosses the Fermi level for pristine Bi2Te3, and the Dirac point of the TSSs and bulk-derived valence bands indicated a shift to lower binding energy upon Pd doping in a rigid-band-like way up to x~0.10. Based on the comparison of the parameters obtained from the SdH and ARPES measurements, the reduction in the kF value in the magnetotransport measurements is likely due to the band bending induced by the Schottky barrier.

AB - We have performed magnetotransport and high-resolution angle-resolved photoelectron spectroscopy (ARPES) measurements on topological insulator PdxBi2Te3(0=x=0.20) single crystals. We have observed unusually high values of magnetoresistance (~1500%) and mobility (~93000cm2V-1s-1) at low temperatures for pristine Bi2Te3 that decrease upon Pd doping. Shubnikov-de Haas (SdH) oscillations were detected for x=0.05, 0.10, confirming the presence of two-dimensional topological surface states (TSSs) for these samples. Hall measurement shows the crossover from n-type charge carriers in pristine Bi2Te3 to p-type charge carriers upon Pd doping. The ARPES measurements show that the conduction band crosses the Fermi level for pristine Bi2Te3, and the Dirac point of the TSSs and bulk-derived valence bands indicated a shift to lower binding energy upon Pd doping in a rigid-band-like way up to x~0.10. Based on the comparison of the parameters obtained from the SdH and ARPES measurements, the reduction in the kF value in the magnetotransport measurements is likely due to the band bending induced by the Schottky barrier.

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DO - 10.1103/PhysRevB.105.115120

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JO - Physical Review B

JF - Physical Review B

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ER -

Magnetotransport and high-resolution angle-resolved photoelectron spectroscopy studies of palladium-doped Bi₂Te₃

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