| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Screening of Local Magnetic Moment by Electrons of Disordered Graphene |
| SHI Li-Peng, XIONG Shi-Jie |
| National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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SHI Li-Peng, XIONG Shi-Jie 2009 Chin. Phys. Lett. 26 067103 |
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Abstract Based on the Anderson impurity model and self-consistent approach, we investigate the condition for the screening of a local magnetic moment by electrons in graphene and the influence of the moment on electronic properties of the system. The results of numerical calculations carried out on a finite sheet of graphene show that when the Fermi energy is above the single occupancy energy and below the double occupancy energy of the local impurity, a magnetic state is possible. A phase diagram in a parameter space spanned by the Coulomb energy U and the Fermi energy is obtained to distinguish the parameter regions for the magnetic and nonmagnetic states of the impurity. We find that the combined effect of the impurity and finite size effect results in alarge charge density near the edges of the finite graphene sheet. The density of states exhibits a peak at the Dirac point which is caused by the appearance of the edge states localized at the zigzag edges of the sheet.
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| Keywords:
71.23.An
75.30.Hx
75.40.Mg
75.70.Ak
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Received: 10 November 2009
Published: 01 June 2009
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| PACS: |
71.23.An
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(Theories and models; localized states)
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75.30.Hx
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(Magnetic impurity interactions)
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75.40.Mg
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(Numerical simulation studies)
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75.70.Ak
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(Magnetic properties of monolayers and thin films)
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[1] Zhou S Y, Gweon G H, Graf J, Fedorov A V, Spataru C D,Diehl R D, Kopelevich Y, Lee D-H, Louie S G and Lanzara A 2006 Nature Phys. 2 595
[2] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y,Dubonos S V, Grigorieva I V and Firsov A A 2004 Science 306 666
[3] Berger C, Song Z M, Li X B, Wu X S, Brown N, Naud C, MayouD, Li T B, Hass J, Marchenkov A N, Conrad E H, First P N and Heer WA D 2006 Science 312 1191
[4] Uchoa B, Kotov V N, Peres N M R and Neto A H C 2008 Phys. Rev. Lett. 101 026805
[5] Eigler D M and Schweizer E K 1990 Nature 344524
[6] Anderson P W 1961 Phys. Rev. 124 41
[7] Fujita M, Wakabayashi K, Nakada K and Kusakabe K 1996 J. Phys. Soc. Jpn. 65 1920
[8] Nakada K, Fujita M, Dresselhaus G and Dressalhaus M S 1996 Phys. Rev. B 54 17954
[9] Wakabayashi K, Fujita M, Ajiki H and Sigrist M 1999 Phys. Rev. B 59 8271
[10] Sasaki K-I, Murakami S and Saito R 2006 J. Phys.Soc. Jpn. 75 074713
[11] Anderson O E, Prasad B L V, Sato H, Enoki T, Hishiyama Y,Kaburagi Y, Yoshikawa M and Bandow S 1998 Phys. Rev. B 58 16387 |
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