Cheng Shao

Cheng Shao

I am a researcher working on nanoscale electron and phonon transport

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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

Pages

Posts

Future Blog Post

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This post will show up by default. To disable scheduling of future posts, edit config.yml and set future: false.

Welcome to Jekyll!

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You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run jekyll serve, which launches a web server and auto-regenerates your site when a file is updated.

Ionic liquids

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Ionic liquids application

photos dog

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图片

photo people

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图片

photos dog

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图片

Experimental techniques for nanoscale thermal measurement

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Some review article on this topic

Vibration modes in amorphous materials

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vibrations in amorphous materials

While in crystals heat is carried by propagating lattice waves, or phonons, in amorphous solids heat carriers are classified as propagons, diffusions, and locons depending on the degree of delocalization of the atomic vibration and its mean free path 12.

  1. P. B. Allen, J. L. Feldman, J. Fabian, and F. Wooten, Philosophical Magazine B 79, 1715(1999). ↩

  2. J. L. Feldman, M. D. Kluge, P. B. Allen, and F. Wooten, Physical Review B 48, 12589 (1993) ↩

Integration Algorithm in Molecular Dynamics Simulaitons

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Integration Algorithm

  • reference
  • The computational effort required is a major consideration in choosing which algorithm to use.
  • An algorithm that is normally more expensive (for example, requires more than one force evaluation per iteration) may permit a significantly longer time step to be used and so, in fact, may be more cost-effective.
  • One of the most important considerations is the energy conservation.
    • a variation of one part in 10^4 is generally considered acceptable.

Lammps modification

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This year I have done a project to investigate the thermal properties of an rigid body system. In this project, we need to predict the thermal conductivity of this system through the Green-Kubo formula. From the paper by Evans at 1976, the exchange of heat flux due to the rotation of molecules need be to considered in the heat flux formula. However, we cannot access to the pairwise torque between molecules in LAMMPS right now. Therefore, I need to make some modification in Lammps to access the rotational degee-of-freedom information and get the correct heat flux information.

The man who trusted atoms

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  • Quantum particle do not have uniquely specific locations or velocities, and collectionos of them must, strictly speaking, be treated as a holistic (“entangled”) whole, rather than as a collection of individuals each of which has a state on its own. (foreword)
  • The distinction between a continuous field and a collection of individual particles is by no means as clear as it was in the classical picture.

switch off the intramolecular nonbonded interaction

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When I running some simulations on ionic liqudis, I realize that may need to turn off the intramolecular nonbonding interactions. Here are some commands in LAMMPS that can do the jobs:

  • night_modify exclude molecule/intra all
  • special_bonds lj/coul 0 0 0

tutorial on IEEE nano 2017 conference

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The IEEE nano conference is held at pittsburgh, so we attend the one day tutorial on nanoscale heat transfer.

Second thought on the Green-Kubo fomular

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  • The key thing is the microscopic expreesion for the heat flux
  • The heat curret is defined as the time derivative of the sum of the moments of the site energies.

Mechine learning: 01

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  • The problem of searching for patterns in data is fundamental one and has a long and successful history.
  • The field of pattern recognition is concerned with the automatic discovery of regularities in data through the use of computer algorithms and with the use of these regularities to take action such as classifying the data into different categories.
  • In mechine learning, a training set is used to tune the parameters of an adaptive model.
  • In most applications, the original training sets are preprocessed to transform them into some new space of variables where, it is hoped, the pattern recognition problem will be easier to solve
    • this pre-processing stage is sometimes also called feature extraction.

phonon focusing

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Phonon scattering at interfaces

Blog Post number 4

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Example Post Formatting

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Featured Image

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Post With A Code Snippet

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You'll find this post in your `_posts` directory - edit this post and re-build (or run with the `-w` switch) to see your changes! To add new posts, simply add a file in the `_posts` directory that follows the convention: YYYY-MM-DD-name-of-post.ext.

Image in Post

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Lorem ipsum thor smash liege-bastogne-liege landbouwkrediet ombregt krabbe, rouleur derby is for lovers bonk giro gilbert bidon. Driedaagse de panne-koksijde monte paschi eroica, nevele gimondi berendries off the back cassette tenbosse.

Test Post

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Using git for version control

Blog Post number 3

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 2

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 1

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

portfolio

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Short description of portfolio item number 1

Short description of portfolio item number 1

publications

A Review of Thermal Transport in Low-Dimensional Materials Under External Perturbation: Effect of Strain, Substrate, and Clustering

Published in Nanoscale and Microscale Thermophysical Engineering, 2017

Access paper here

Recommended citation: Cheng Shao, Xiaoxiang Yu, Nuo Yang, Yanan Yue, Hua Bao, "A Review of Thermal Transport in Low-Dimensional Materials Under External Perturbation: Effect of Strain, Substrate, and Clustering." Nanoscale and Microscale Thermophysical Engineering, 2017. http://dx.doi.org/10.1080/15567265.2017.1286421

Two-path phonon interference resonance induces a stop band in a silicon crystal matrix with a multilayer array of embedded nanoparticles

Published in Physical Review B, 2020

00000 Publisher: American Physical Society

Recommended citation: Shiqian Hu, Lei Feng, Cheng Shao, Ivan Strelnikov, Yuriy Kosevich, Junichiro Shiomi, "Two-path phonon interference resonance induces a stop band in a silicon crystal matrix with a multilayer array of embedded nanoparticles." Physical Review B, 2020. https://link.aps.org/doi/10.1103/PhysRevB.102.024301

Weaker bonding can give larger thermal conductance at highly mismatched interfaces

Published in Science Advances, 2021

00000 Publisher: American Association for the Advancement of Science Section: Research Article

Recommended citation: Bin Xu, Shiqian Hu, Shih-Wei Hung, Cheng Shao, Harsh Chandra, Fu-Rong Chen, Takashi Kodama, Junichiro Shiomi, "Weaker bonding can give larger thermal conductance at highly mismatched interfaces." Science Advances, 2021. https://advances.sciencemag.org/content/7/17/eabf8197

Asymmetrical carbon nanotubes exhibit opposing thermal rectification behaviors under different heat baths

Published in International Journal of Heat and Mass Transfer, 2022

Access paper here

Recommended citation: Wei-Jen Chen, Biao Feng, Cheng Shao, Jin Yang, Liwu Fan, Wee-Liat Ong, I-Ling Chang, "Asymmetrical carbon nanotubes exhibit opposing thermal rectification behaviors under different heat baths." International Journal of Heat and Mass Transfer, 2022. https://www.sciencedirect.com/science/article/pii/S001793102101440X

talks

teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

This is a description of a teaching experience. You can use markdown like any other post.

Teaching experience 2

Workshop, University 1, Department, 2015

This is a description of a teaching experience. You can use markdown like any other post.