Negative to positive crossover of the magnetoresistance in layered WS{sub 2}

Journal Article · Mon Apr 11 04:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4946859· OSTI ID:22591584

Zhang, Yangwei; Ning, Honglie; Li, Yanan; Liu, Yanzhao ^[1]; Wang, Jian ^[1]

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1. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871 (China)

The discovery of graphene ignited intensive investigation of two-dimensional materials. A typical two-dimensional material, transition metal dichalcogenide (TMDC), attracts much attention because of its excellent performance in field effect transistor measurements and applications. Particularly, when TMDC reaches the dimension of a few layers, a wide range of electronic and optical properties can be detected that are in striking contrast to bulk samples. In this letter, we synthesized WS{sub 2} single-crystal nanoflakes using physical vapor deposition and carried out a series of measurements of the contact resistance and magnetoresistance. Focused ion beam (FIB) technology was applied to deposit Pt electrodes on the WS{sub 2} flakes, and the FIB-deposited contacts exhibited linear electrical characteristics. Resistance versus temperature measurements showed similar Mott variable range hopping behavior in different magnetic fields. Additionally, a temperature-modulated negative-to-positive magnetoresistance transition was observed. Our work reveals the magnetotransport characteristics of WS{sub 2} flakes, which may stimulate further studies of the properties of TMDC and its corresponding electronic and optoelectronic applications.

• OSTI ID: 22591584
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 15 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRODES
FIELD EFFECT TRANSISTORS
GRAPHENE
ION BEAMS
LAYERS
MAGNETORESISTANCE
MONOCRYSTALS
OPTICAL PROPERTIES
PERFORMANCE
PHYSICAL VAPOR DEPOSITION
TRANSITION ELEMENTS
TUNGSTEN SULFIDES
TWO-DIMENSIONAL SYSTEMS
VAPORS