Mn overlayers on PbTe (111): Substitutional adsorption and interface formation

doi:10.1088/1674-1056/23/12/127901

Abstract The formation of the Mn/PbTe (111) interface is investigated by photoemission spectrum. The core level behavior of Mn 2p is consistent with Mn substitutional adsorption during the initial Mn deposition, forming a (√3× √3)R30°-Pb_0.67Mn_0.33Te phase of the second layer. Further deposition of Mn can cause metallic Mn islands to cover the substitutional substrate. Ultraviolet photoemission measurements show that the Fermi level is shifted into the conduction band, indicating Ohmic contact formation at the Mn/PbTe (111) interface. The valence band maximum associated with the Pb_0.67Mn_0.33Te layer is located at 1.27 eV below the Fermi level, and a schematic electronic structure of the Mn/PbTe (111) interface is given. The work function of the substituted substrate with Pb-covered Mn islands is determined to be 4.16 eV, in comparison with 4.35 eV for the Pb-covered substituted substrate and 3.95 eV for the pristine PbTe (111) surface.

Keywords: photoemission spectrum metal–semiconductor electronic structure PbTe

Received: 22 April 2014
Revised: 31 July 2014
Accepted manuscript online:

PACS:	79.60.-i	(Photoemission and photoelectron spectra)
	79.60.Jv	(Interfaces; heterostructures; nanostructures)
	73.30.+y	(Surface double layers, Schottky barriers, and work functions)
	73.20.At	(Surface states, band structure, electron density of states)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074214, 51202149, and 11204180)，the Natural Science Foundation of Zhejiang Province, China (Grant No. LQ12F04001), the Scientific Research Fund of Zhejiang Provincial Education Department, China (Grant No. Y201121234), and the Ministry of Science and Technology of China.

Corresponding Authors: He Pi-Mo
E-mail: phypmhe@dial.zju.edu.cn

Cite this article:

Wu Hai-Fei (吴海飞), Zhang Han-Jie (张寒洁), Lu Yun-Hao (陆赟豪), Yan Yong-Hong (鄢永红), Li Hai-Yang (李海洋), Bao Shi-Ning (鲍世宁), He Pi-Mo (何丕模) Mn overlayers on PbTe (111): Substitutional adsorption and interface formation 2014 Chin. Phys. B 23 127901


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