Electron-Phonon Coupling in Two-Dimensional Silicene and Germanene
Following the work in graphene, we report a first-principles study of electron-phonon coupling (EPC) in low-buckled (LB) monolayer silicene and germanene. Despite of the similar honeycomb atomic arrangement and linear band dispersion, the EPC matrix-element squares of the \(\Gamma\)-\(E_g\) and K-\(...
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| creator | Jia-An, Yan Stein, Ryan Schaefer, David M Xiao-Qian, Wang Chou, M Y |
| description | Following the work in graphene, we report a first-principles study of electron-phonon coupling (EPC) in low-buckled (LB) monolayer silicene and germanene. Despite of the similar honeycomb atomic arrangement and linear band dispersion, the EPC matrix-element squares of the \(\Gamma\)-\(E_g\) and K-\(A_1\) modes in silicene are only about 50% of those in graphene. However, the smaller Fermi velocity in silicene compensates this reduction by providing a larger joint electronic density of states near the Dirac point. We predict that Kohn anomalies associated with these two optical modes are significant in silicene. In addition, the EPC-induced frequency shift and linewidth of the Raman-active \(\Gamma\)-\(E_g\) mode in silicene are calculated as a function of doping. The results are comparable to those in graphene, indicating a similar non-adiabatic dynamical origin. In contrast, the EPC in germanene is found to be much reduced. |
| doi_str_mv | 10.48550/arxiv.1308.4591 |
| format | Article |
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Despite of the similar honeycomb atomic arrangement and linear band dispersion, the EPC matrix-element squares of the \(\Gamma\)-\(E_g\) and K-\(A_1\) modes in silicene are only about 50% of those in graphene. However, the smaller Fermi velocity in silicene compensates this reduction by providing a larger joint electronic density of states near the Dirac point. We predict that Kohn anomalies associated with these two optical modes are significant in silicene. In addition, the EPC-induced frequency shift and linewidth of the Raman-active \(\Gamma\)-\(E_g\) mode in silicene are calculated as a function of doping. The results are comparable to those in graphene, indicating a similar non-adiabatic dynamical origin. 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Despite of the similar honeycomb atomic arrangement and linear band dispersion, the EPC matrix-element squares of the \(\Gamma\)-\(E_g\) and K-\(A_1\) modes in silicene are only about 50% of those in graphene. However, the smaller Fermi velocity in silicene compensates this reduction by providing a larger joint electronic density of states near the Dirac point. We predict that Kohn anomalies associated with these two optical modes are significant in silicene. In addition, the EPC-induced frequency shift and linewidth of the Raman-active \(\Gamma\)-\(E_g\) mode in silicene are calculated as a function of doping. The results are comparable to those in graphene, indicating a similar non-adiabatic dynamical origin. In contrast, the EPC in germanene is found to be much reduced.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1308.4591</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Anomalies Coupling First principles Frequency shift Graphene Honeycomb construction Mathematical analysis Matrix methods Phonons Physics - Mesoscale and Nanoscale Physics Silicene Two dimensional materials |
| title | Electron-Phonon Coupling in Two-Dimensional Silicene and Germanene |
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