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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Magnetic effects in sulfur-decorated graphene.
Choongyu Hwang1,2, Shane A Cybart1,3, S J Shin1,4
1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Scientific Reports
|February 19, 2016
Summary
Graphene, a non-magnetic material, exhibits magnetic effects when placed near sulfur. This interaction creates an energy gap and resistance changes, suggesting new quantum phases in two-dimensional materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Interactions between different materials can lead to novel physical properties.
- Strong electronic correlations, like magnetism and superconductivity, arise from enhanced Coulomb interactions.
- Two-dimensional (2D) materials offer a platform for exploring new phenomena due to their tunable properties.
Purpose of the Study:
- To investigate magnetic effects in graphene when in proximity to sulfur.
- To explore the development of novel quantum phases in graphene-based compounds.
Main Methods:
- Experimental investigation of graphene/sulfur compound properties.
- Analysis of electronic and magnetic responses at varying temperatures.
Main Results:
- Graphene in proximity to sulfur shows an energy gap at the Fermi energy, which develops with decreasing temperature.
- A steep increase in resistance and changes in magneto-resistance slope were observed.
- Magnetic hysteresis indicates the emergence of magnetic ordering.
Conclusions:
- The observed electronic and magnetic responses suggest the onset of low-temperature magnetic ordering in the graphene/sulfur system.
- These findings offer insights into the potential for discovering new quantum phases in 2D material compounds.
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