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Your search keyword '"Sun, Chang Q"' showing total 16 results
Start Over Author "Sun, Chang Q" Journal applied physics letters
16 results on '"Sun, Chang Q"'

14. Magnetism induced by excess electrons trapped at diamagnetic edge-quantum well in multi-layer graphene.

Author

Xi Zhang, Chao Wang, Sun, Chang Q., and Diao, Dongfeng

Subjects
MAGNETISM, ELECTRIC properties of graphene, CYCLOTRON resonance, DIAMAGNETIC materials, DENSITY functional theory, QUANTUM well devices, NANORIBBONS, HUBBARD model
Abstract

In this paper, we clarified a robust mechanism of magnetism generated by excess electrons captured by edge-quantum well of diamagnetic armchair edges. Consistency between density functional theory calculations and electron cyclotron resonance experiments verified that: (1) Multi-layer armchair nanoribbons are stable with proper amounts of excess electrons which can provide net spin; (2) Since under-coordination induces lattice relaxation and potential well modulation, electrons tend to be trapped at edges; and (3) Neither large amount of excess electrons nor positive charges can induce magnetism. This work shed light on the development of graphene devices in its magnetic applications. [ABSTRACT FROM AUTHOR]

Published
2014
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16. A first principles study on the full-Heusler compound Cr2MnAl.

Author

Jia Li, Yangxian Li, Guoxiang Zhou, Yubao Sun, and Sun, Chang Q.

Subjects
ELECTRONIC structure, FERROMAGNETISM, ATOMS, SPIN waves, PHYSICAL & theoretical chemistry
Abstract

The Hg2CuTi-type structure is found to be preferable energy wise than the Cu2MnAl-type structure for full-Heusler Cr2MnAl and exhibits half-metallic ferromagnetism based on first principles. The calculations for the mixed compounds with disorder between B and D sublattices reveal that the case of exchanging one atom maintains the half-metallicity while the case of exchanging two atoms loses it. The electronic structures of the atoms at sites A or C are affected mainly by the nearest-neighboring coordination while that of the atoms at site B are determined by the next-nearest-neighboring coordination. [ABSTRACT FROM AUTHOR]

Published
2009
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