Accessing topological surface states and negative MR in sculpted nanowires of Bi2Te3 at ultra-low temperature

Abstract

Milling of 2D flakes is a simple method to fabricate nanomaterial of any desired shape and size. Inherently milling process can introduce the impurity or disorder which might show exotic quantum transport phenomenon when studied at the low temperature. Here we report temperature dependent weak antilocalization (WAL) effects in the sculpted nanowires of topological insulator in the presence of perpendicular magnetic field. The quadratic and linear magnetoconductivity (MC) curves at low temperature indicate the bulk contribution in the transport. A cusp feature in magnetoconductivity curves (positive magnetoresistance) at ultra low temperature and at magnetic field, less than 1T represent the WAL indicating the transport through surface states. The MC curves are discussed by using the 2D Hikami Larkin Nagaoka theory. The crossover interplay nature of positive and negative magnetoresistance observed in the MR curve at ultra low temperature. Our results indicate that transport through topological surface states (TSS) in sculpted nanowires of Bi2Te3 can be achieved at mK range and linear MR observed at 2 K could be the coexistence of electron transport through TSS and contribution from the bulk band.

arXiv comment8 pages 3 fig

References in corpus (28)

• Topological Insulators
• Aharonov-Bohm interference in topological insulator nanoribbons
• Signatures of the Adler-Bell-Jackiw chiral anomaly in a Weyl Fermion semimetal
• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
• Negative Magnetoresistance in Dirac Semimetal Cd3As2
• Few-layer Nanoplates of Bi2Se3 and Bi2Te3 with Highly Tunable Chemical Potential
• Crossover between weak localization and weak antilocalization in magnetically doped topological insulator
• Thickness-independent transport channels in topological insulator Bi2Se3 thin films
• Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films
• Tunable Surface Conductivity in Bi2Se3 Revealed in Diffusive Electron Transport
• Linear magnetoresistance in topological insulators: Quantum phase coherence effects at high temperatures
• Weak antilocalization in topological insulator Bi${}_2$Te${}_3$ microflakes
• Negative Magnetoresistance without Chiral Anomaly in Topological Insulators
• Gigantic negative magnetoresistance in a disordered topological insulator
• Observation of Anderson localization in ultrathin films of three-dimensional topological insulators
• Growth of High-Mobility Bi2Te2Se Nanoplatelets on hBN Sheets by van der Waals Epitaxy
• Crossover between Weak Antilocalization and Weak Localization of Bulk States in Ultrathin Bi2Se3 Films
• Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3
• 2D layered transport properties from topological insulator Bi${}_2$Se${}_3$ single crystals and micro flakes
• Evidence of surface transport and weak anti-localization in single crystal of Bi2Te2Se topological insulator
• Weak Localization Effects as Evidence for Bulk Quantization in Thin Films Bi2Se3
• Defect induced negative magnetoresistance and surface state immunity in topological insulator BiSbTeSe2
• Weak Localization and Antilocalization in Topological Materials with Impurity Spin-Orbit Interactions
• Observation of quantum oscillations in FIB fabricated nanowires of topological insulator (Bi2Se3)
• Materials analysis and focused ion beam nanofabrication of topological insulator Bi2Se3
• Spin-dependent scattering induced negative magnetoresistance in topological insulator Bi2Te3 nanowires
• FIB synthesis of Bi2Se3 1D nanowires demonstrating the co-existence of Shubnikov-de Haas oscillations and linear magnetoresistance