Anomalous Transition in Thermal Conductivity in Germanene Monolayer

• DOI: 10.48550/arxiv.2411.14197
• Publication Date: 2024-11-21
• Authors: Sapta Sindhu Paul...; Sourav Thapliyal; Santosh Mogurampelly
• Keywords: Germanene

We report an anomalous temperature-induced transition in thermal conductivity germanene monolayer around a critical temperature $T_c = 350 \, \text{K}$. Equilibrium molecular dynamics simulations reveal from $\kappa \sim T^{-2}$ scaling below $T_c$ to T^{-1/2}$ above, contrasting with conventional T^{-1}$ behavior. This correlates long-scale characteristics timescale $\tau_2$ obtained double exponential fitting of heat current autocorrelation function. Phonon mode analysis using normal decomposition indicates that redshift TA phonons reduces the acoustic-optical phonon gap, enhancing phonon-phonon scattering and driving Moreover, non equilibrium find convergent sample size, agreement coupling theory, owing high ZA due inherent buckling germanene.