Two-dimensional Mott variable-range hopping transport in a disordered MoS${}_2$ nanoflake

Abstract

The transport characteristics of a disordered MoS${}_2$ nanoflake in the insulator regime are studied by electrical and magnetotransport measurements. The layered MoS${}_2$ nanoflake is exfoliated from a bulk MoS${}_2$ crystal and the conductance $G$ and magnetoresistance are measured in a four-probe setup over a wide range of temperatures. At high temperatures, we observe that ${\log }_{10}G$ exhibits a $-T^{-1}$ temperature dependence and the transport in the nanoflake dominantly arises from thermal activation. At low temperatures, where the transport in the nanoflake dominantly takes place via variable-range hopping (VRH) processes, we observe that ${\log }_{10}G$ exhibits a $-T^{-1/3}$ temperature dependence, an evidence for the two-dimensional (2D) Mott VRH transport. The measured low-field magnetoresistance of the nanoflake in the insulator regime exhibits a quadratic magnetic field dependence $\sim \alpha B^2$ with $\alpha \sim T^{-1}$, fully consistent with the 2D Mott VRH transport in the nanoflake.

arXiv comment14 pages, 4 figures, and Supplemental Materials

References in corpus (12)

• Mobility engineering and metal-insulator transition in monolayer MoS2
• First-principles study of the phonon-limited mobility in n-type single-layer MoS2
• Hopping Transport through Defect-induced Localized States in Molybdenum Disulfide
• The Nature of Electronic States in Atomically Thin MoS2 Field-Effect Transistors
• Electrical Transport Properties of Single-Layer WS2
• Electronic transport and device prospects of monolayer molybdenum disulphide grown by chemical vapour deposition
• Analyzing the Carrier Mobility in Transition-metal Dichalcogenide MoS2 Field-effect Transistors
• Band-Like Transport in High Mobility Unencapsulated Single-Layer MoS2 Transistors
• Large Thermoelectricity via Variable Range Hopping in Chemical Vapor Deposition Grown Single-layer MoS2
• Transport in disordered monolayer molybdenum disulfide nanoflakes: evidence for inhomogeneous charge transport
• Negative to Positive Crossover of Magnetoresistance in Layered WS2 with Ohmic Contact
• Efros-Shklovskii variable range hopping and nonlinear transport in 1T/1T${}^{\prime }$-MoS${}_2$

Cited by in corpus (2)

• Emergence of insulating ferrimagnetism and perpendicular magnetic anisotropy in 3d-5d perovskite oxide composite films for insulator spintronic
• Evidence of the Coulomb gap in the density of states of MoS${}_2$