Thermal transport at sub-micron scales differs substantially from that at normal length scales. Physical laws for heat transfer, such as Fourier's law for heat conduction, fail when the mean free path of energy carriers becomes comparable to the length scales of interest. This occurs in modern microelectronic devices, where for example, channel dimensions, now below 100 nm in length, are comparable to the mean free path of phonons in silicon at room temperature. Research in the nanoscale thermal transport area addresses novel physics at small length and time scales and novel technologies that exploit this class of physics.
Learn more about nanoscale thermo transport from the resources available on this site, listed below.
ME 697R Lecture 5.5A: First Principles Method - Development of Empirical Interatomic Potentials using DFT I
18 Feb 2020 | | Contributor(s):: Xiulin Ruan
Solar Ovens: Understanding Energy Transfer
28 Jan 2020 | | Contributor(s):: Christina Levyssohn-Silva, NNCI Nano
At the end of this lesson, students will understand that solar energy radiates from the sun to the Earth and gets trapped within the oven. Students will be able to explain how the thermal energy flows from the hot air to the cold water via conduction and will indicate that this would continue...
ME 697R Lecture 5.2: First Principles Method - Electronic Structure of Solids
29 Oct 2019 | | Contributor(s):: Xiulin Ruan
ME 697R: Computation Methods for Nanoscale Energy Transport
21 Aug 2019 | | Contributor(s):: Xiulin Ruan
Fall 2019 This Course is in productionThis course provides a detailed presentation of the computational methods used to treat energy transport and conversion in the atomic and nanoscales. The methods include lattice dynamics, molecular dynamics, first principles calculations, Boltzmann transport...
Research in Xu’s Group
07 Aug 2019 | | Contributor(s):: Xianfan Xu
Ricardo Agustín Sánchez-Mancera
Se Kwon Kim
Electronic Structure and Transport Properties of Graphene on Hexagonal Boron Nitride
06 Dec 2018 | | Contributor(s):: Shukai Yao, Luis Regalado Bermejo, Alejandro Strachan
Graphene is a zero-bandgap conductor with high carrier mobility. It is desired to search for an opening of band structure of graphene such that this kind of material can be applied in electronic devices. Depositing hexagonal Boron Nitride (h-BN) opens a bandgap in the band structure of...
Developing a machine learning tool to optimize thermal transport
14 Aug 2018 | | Contributor(s):: Adam Sandor Garrett, proycho, Xiulin Ruan, creynolds
The purpose of this tool is to optimize SiGe super-lattices to have the lowest possible thermal conductivity. This poster describes the processes used in the tool and how it impacts thermoelectrics.
Sebastian Jan Juchnowski
Spectral analysis of non-equilibrium molecular dynamics
28 Jun 2017 | | Contributor(s):: Tianli Feng, Yang Zhong, Divya Chalise, Xiulin Ruan
Extract the phonon modal temperature and heat flux from non-equilibrium molecular dynamics
Truncated Levy model for TDTR
22 Nov 2016 | | Contributor(s):: Amr Mohammed, Ali Shakouri
Simulate the transient thermal response of materials probed using optical pump probe experiment (TDTR)
Fundamentals of Phonon Transport Modeling L1: Introduction
03 Jan 2017 | | Contributor(s):: Alan McGaughey, Xiulin Ruan
Part of the 2016 IMECE Tutorial: Fundamentals of Phonon Transport Modeling: Formulation, Implementation, and Applications.
Fundamentals of Phonon Transport Modeling L2: MD Simulation, Green Kubo, Direct Method
03 Jan 2017 | | Contributor(s):: Xiulin Ruan, Alan McGaughey
Fundamentals of Phonon Transport Modeling L3: Harmonic Lattice Dynamics, Spectral Methods
Fundamentals of Phonon Transport Modeling L4: Anharmonic Lattice dynamics, First Principles
Fundamentals of Phonon Transport Modeling L6: Phonon-Electron Coupling and Non-equilibrium
Radiative Heat Transfer at the Nanoscale
12 Dec 2016 | | Contributor(s):: Pramod Reddy
In this talk, I will describe ongoing efforts in our group to experimentally elucidate nanoscale heat radiation. Specifically, I will present our recent experimental work where we have addressed the following questions: 1) Can existing theories accurately describe radiative heat transfer in...