Phys. Rev. Lett. 82, 3074–3077 (1999)

Structures of GaN(0001)- (2×2), - (4×4), and - (5×5) Surface Reconstructions

Abstract

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Qi-Kun Xue^1,2, Q. Z. Xue¹, R. Z. Bakhtizin¹, Y. Hasegawa¹, I. S. T. Tsong^1,*, and T. Sakurai¹
¹Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
²Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China

T. Ohno
National Research Institute of Metals, Tsukuba 305-0047, Japan

Received 19 November 1998; published in the issue dated 12 April 1999

Various reconstructions on the GaN(0001) surface are studied by scanning tunneling microscopy (STM). Based on the comparison between the STM observations and first-principles total-energy calculations, we propose an adatom scheme for the basic 2×2 and 4×4 structures, and others as well. It is revealed that the 5×5 phase consists of a linear chain of unevenly displaced Ga adatoms along the [112̅ 0] direction due to lattice relaxation.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.82.3074

DOI:

10.1103/PhysRevLett.82.3074

PACS:

61.16.Ch, 61.14.Hg, 71.15.Nc, 81.05.Ea

^*Permanent address: Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287.

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Phys. Rev. Lett. 82, 3074–3077 (1999)

Structures of GaN(0001)- (2×2), - (4×4), and - (5×5) Surface Reconstructions

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