Tuning Conductivity and Spin Dynamics in Few-Layer Graphene via In Situ Potassium Exposure
| Autor: | Bálint Náfrádi, S. Kollarics, Konstantin F. Edelthalhammer, Ferenc Simon, Frank Hauke, Péter Szirmai, O. Sági, Bence G. Márkus, Andreas Hirsch, László Forró |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
compound Potassium Intercalation (chemistry) metals chemistry.chemical_element FOS: Physical sciences doping 02 engineering and technology Conductivity 01 natural sciences law.invention Condensed Matter - Strongly Correlated Electrons c-60 intercalation law 0103 physical sciences sodium spintronics 010302 applied physics Condensed Matter - Materials Science Spintronics Strongly Correlated Electrons (cond-mat.str-el) Graphene superconductivity electron spin resonance rbc60 Doping charge transfer Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials resonance chemistry cavity perturbation technique Chemical physics functionalization Charge carrier graphite lamellar compounds 0210 nano-technology Order of magnitude |
| DOI: | 10.48550/arxiv.2007.07057 |
| Popis: | Chemical modification such as intercalation or doping of novel materials is of great importance for exploratory material science and applications in various fields of physics and chemistry. Herein, the systematic intercalation of chemically exfoliated few-layer graphene with potassium is reported while monitoring the sample resistance using microwave conductivity. It is found that the conductivity of the samples increases by about an order of magnitude upon potassium exposure. The increased number of charge carriers deduced from the electron spin resonance (ESR) intensity also reflects this increment. The doped phases exhibit two asymmetric Dysonian lines in ESR, a usual sign of the presence of mobile charge carriers. The width of the broader component increases with the doping steps; however, the narrow components seem to have a constant line width. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|