Structures of GaN(0001)- <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mn>2</mn><mo>×</mo><mn>2</mn><mo>)</mo></math>, - <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mn>4</mn><mo>×</mo><mn>4</mn><mo>)</mo></math>, and - <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mn>5</mn><mo>×</mo><mn>5</mn><mo>)</mo></math> Surface Reconstructions

Qi-Kun Xue; Q. Z. Xue; R. Z. Bakhtizin; Y. Hasegawa; I. S. T. Tsong; T. Sakurai; T. Ohno

doi:10.1103/PhysRevLett.82.3074

Structures of GaN(0001)- $(2 \times 2)$ , - $(4 \times 4)$ , and - $(5 \times 5)$ Surface Reconstructions

Qi-Kun Xue, Q. Z. Xue, R. Z. Bakhtizin, Y. Hasegawa, I. S. T. Tsong, T. Sakurai, and T. Ohno

Phys. Rev. Lett. 82, 3074 – Published 12 April 1999

Abstract

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 $2 \times 2$ and $4 \times 4$ structures, and others as well. It is revealed that the $5 \times 5$ phase consists of a linear chain of unevenly displaced Ga adatoms along the $[11 \bar{2} 0]$ direction due to lattice relaxation.

Received 19 November 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.3074

Authors & Affiliations

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