| Issue |
EPL
Volume 89, Number 3, February 2010
|
|
|---|---|---|
| Article Number | 37002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/89/37002 | |
| Published online | 17 February 2010 | |
Anomalous valley magnetic moment of graphene
Department of Applied Physics, Non-equilibrium Condensed Matter and Quantum Engineering Laboratory, KLME, Xi'an Jiaotong University - Xi'an, 710049, PRC
Corresponding author: liudq@mail.xjtu.edu.cn
Received:
16
October
2009
Accepted:
15
January
2010
Carrier interactions on graphene are studied. The study shows that besides the well-known Coulomb repulsion between carriers, there also exist four-fermion interactions associated with the U-process, one of which attracts carriers in different valleys. We then calculate the contributions to the valley magnetic moment from vertex corrections and from four-fermion corrections explicitly. The relative contributions are - 18% and 3%, respectively. Lastly we point out that we can mimic the heavy-quarkonium system by carrier interactions in graphene.
PACS: 72.80.Vp – Electronic transport in graphene / 75.75.-c – Magnetic properties of nanostructures / 75.10.Jm – Quantized spin models, including quantum spin frustration
© EPLA, 2010
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