| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Electron-phonon Coupling in Gallium-Doped Germanium |
DAI Jun, LI Zhen-Yu, YANG Jin-Long |
| Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei 230026 |
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DAI Jun, LI Zhen-Yu, YANG Jin-Long 2010 Chin. Phys. Lett. 27 086102 |
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Abstract The electronic structure, lattice dynamics, and electron-phonon coupling of gallium-doped germanium are investigated using a initio supercell methods. Our results indicate the superconducting transition in gallium-doped germanium can be explained within a standard phonon mediated mechanism. The contribution of acoustic modes to the coupling constant λ almost entirely comes from Ga related modes, and ~25% to λ. The calculated coupling constant is 0.35 and the corresponding transition temperature is 0.44 K for the gallium-doped germanium with 6.25% gallium content using Coulomb pseudopotential μ*=0.1, in agreement well with the experimental data.
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| Keywords:
61.72.uf
74.70.-b
74.20.Pq
70.20.Fg
74.25.Kc
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Received: 07 April 2010
Published: 28 July 2010
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