Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi                         4                         Te                         7

Priyanath Mal; Bipul Das; Archana Lakhani; Ganesh Bera; G. R. Turpu; Jong-Ching Wu; C. V. Tomy; Pradip Das

doi:10.1038/s41598-019-43534-7

Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi ₄ Te ₇

Priyanath Mal, Bipul Das, Archana Lakhani, Ganesh Bera, G. R. Turpu, Jong-Ching Wu, C. V. Tomy, Pradip Das

Department of Physics

Research output: Contribution to journal › Article

Abstract

We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in a mesoscopic topological insulator PbBi ₄ Te ₇ device. From SdH oscillations, the evidence of Dirac fermions with π Berry phase is found and the experimentally determined two main Fermi wave vectors are correlated to two surface Dirac cones (buried one inside the other) of layered topological insulator PbBi ₄ Te ₇ . We have also found evidence of conductance fluctuations, the root mean square amplitude of which is much higher than the usual universal conductance fluctuations observed in nanometer size sample. Calculated autocorrelation functions indicate periodic unique fluctuations may be associated with the topological surface states in the compound.

Original language	English
Article number	7018
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-43534-7
Publication status	Published - 2019 Dec 1

All Science Journal Classification (ASJC) codes

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Mal, P., Das, B., Lakhani, A., Bera, G., Turpu, G. R., Wu, J-C., Tomy, C. V., & Das, P. (2019). Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi ₄ Te ₇ Scientific Reports, 9(1), [7018]. https://doi.org/10.1038/s41598-019-43534-7

Mal, Priyanath ; Das, Bipul ; Lakhani, Archana ; Bera, Ganesh ; Turpu, G. R. ; Wu, Jong-Ching ; Tomy, C. V. ; Das, Pradip. / Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi ₄ Te ₇ In: Scientific Reports. 2019 ; Vol. 9, No. 1.

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title = " Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi 4 Te 7 ",

abstract = " We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in a mesoscopic topological insulator PbBi 4 Te 7 device. From SdH oscillations, the evidence of Dirac fermions with π Berry phase is found and the experimentally determined two main Fermi wave vectors are correlated to two surface Dirac cones (buried one inside the other) of layered topological insulator PbBi 4 Te 7 . We have also found evidence of conductance fluctuations, the root mean square amplitude of which is much higher than the usual universal conductance fluctuations observed in nanometer size sample. Calculated autocorrelation functions indicate periodic unique fluctuations may be associated with the topological surface states in the compound. ",

author = "Priyanath Mal and Bipul Das and Archana Lakhani and Ganesh Bera and Turpu, {G. R.} and Jong-Ching Wu and Tomy, {C. V.} and Pradip Das",

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Mal, P, Das, B, Lakhani, A, Bera, G, Turpu, GR, Wu, J-C, Tomy, CV & Das, P 2019, ' Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi ₄ Te ₇ ', Scientific Reports, vol. 9, no. 1, 7018. https://doi.org/10.1038/s41598-019-43534-7

Unusual Conductance Fluctuations and Quantum Oscillation in Mesoscopic Topological Insulator PbBi ₄ Te ₇ . / Mal, Priyanath; Das, Bipul; Lakhani, Archana; Bera, Ganesh; Turpu, G. R.; Wu, Jong-Ching; Tomy, C. V.; Das, Pradip.

In: Scientific Reports, Vol. 9, No. 1, 7018, 01.12.2019.

Research output: Contribution to journal › Article

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