期刊
PHYSICAL REVIEW B
卷 86, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.085428
关键词
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资金
- Office of Naval Research (ONR) [N00014-10-1-0181, N00014-11-1-0384, N00014-08-1-0915, N00014-07-1-0825 (DURIP)]
- National Science Foundation (NSF) [DMR-0855358, DMR-0701558, DMR-1066158]
- ARO [W911NF-12-1-0085]
- Office of Basic Energy Sciences [CR-46612]
- MRI from NSF [0959124]
- HPCMO of the US Department of Defense
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0855358] Funding Source: National Science Foundation
A series of measurements using a technique called electrostatic-manipulation scanning tunneling microscopy (EM-STM) were performed on a highly oriented pyrolytic graphite surface. The electrostatic interaction between the STM tip and the sample can be tuned to produce both reversible and irreversible large-scale movement of the graphite surface. Under this influence, atomic-resolution STM images reveal that a continuous electronic transition from triangular symmetry, where only alternate atoms are imaged, to hexagonal symmetry can be systematically controlled. Density functional theory (DFT) calculations reveal that this transition can be related to vertical displacements of the top layer of graphite relative to the bulk. Evidence for horizontal shifts in the top layer of graphite is also presented. Excellent agreement is found between experimental STM images and those simulated using DFT.
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