Scanning tunneling spectroscopy of a magnetic atom on graphene in the Kondo regime

Journal Article · Tue Jun 23 00:00:00 EDT 2009 · Europhysics Letters

DOI:https://doi.org/10.1209/0295-5075/86/58004· OSTI ID:1236758

Zhuang, Huai -Bin ^[1]; Sun, Qing -feng ^[1]; Xie, X. C. ^[2]

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1. Chinese Academy of Sciences (CAS), Beijing (China)
2. Chinese Academy of Sciences (CAS), Beijing (China); Oklahoma State Univ., Stillwater, OK (United States)

In this study, the Kondo effect in the system consisting of a magnetic adatom on the graphene is studied. By using the non-equilibrium Green function method with the slave-boson mean field approximation, the local density of state (LDOS) and the conductance are calculated. For a doped graphene, the Kondo phase is present at all time. Surprisingly, two kinds of Kondo regimes are revealed. But for the undoped graphene, the Kondo phase only exists if the adatom’s energy level is beyond a critical value. The conductance is similar to the LDOS, thus, the Kondo peak in the LDOS can be observed with the scanning tunneling spectroscopy. In addition, in the presence of a direct coupling between the STM tip and the graphene, the conductance may be dramatically enhanced, depending on the coupling site.

• Research Organization: Oklahoma State Univ., Stillwater, OK (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: FG02-04ER46124
• OSTI ID: 1236758
• Journal Information: Europhysics Letters, Vol. 86, Issue 5; ISSN 0295-5075
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

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