Negative Differential Thermal Conductance in Graphene Nanoribbons: Toward Graphene Thermal Circuits
نویسنده
چکیده
Graphene has received much attention due to its remarkable electronic properties. It also has exceptional thermal properties, such as an unusually high thermal conductivity. Understanding thermal transport of graphene is of great importance to the applications for future graphene‐based devices in energy efficient nanoelectronics. We have calculated the thermal current of symmetric and asymmetric graphene nanoribbons (GNRs) up to large temperature bias and obtained the negative differential thermal conductance (NDTC). We adopt classical molecular dynamics simulation based on the Brenner potential of carbon‐carbon bonding with Nosé‐Hoover thermostats. For asymmetric GNRs, the NDTC exists only when the temperature at the narrower end is larger than that at the wider end. The NDTC is probably due to the decrease of the thermal conductivity when the average temperature is decreased. A possible thermal amplifier is constructed based on the effect of NDTC. The NDTC in GNRs can have potential applications in nanoscale thermal management. It can also open the possibility to building “thermal logic”, using heat as a novel computational variable to process information.
منابع مشابه
Nonlinear thermal transport and negative differential thermal conductance in graphene nanoribbons
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تاریخ انتشار 2009