people in the group]
Positions open: We may
have positions for postdoc
fellows, graduate students, and undergraduate students. Please check here.
02/2016: Faculty Award.
Professor Ruan received the College of Engineering Faculty
Early Career Research Award.
02/2016: Student Award.
Tianli received the Bilsland Dissertation Fellowship.
11/2015: ASME Best Paper
Award. Yaguo Wang and Bo Qiu, former PhD students, and
Professors Xianfan Xu and Xiulin Ruan win ASME Best Paper
Award. See news press
08/2015: DARPA award.
Professor Ruan won a DARPA grant as the PI. This is
our first DARPA award!
Appointment of Dr. Ruan. Professor Ruan took the
position of Associate Director for Graduate Recruitment and
Admissions in ME. He is passionate about attracting the best
students to our graduate program.
05/2015: Student Award.
Zuyuan Wang received the Lambert Teaching Fellowship.
Sustainable energy and energy
efficiency are among the greatest challenges facing the society, and heat
transfer scientists and engineers can contribute. Solutions to these
challenges rely on extraordinarily fundamental and
innovative approaches. In our lab, we are developing
efficient energy and renewable energy technologies using the emerging nanotechnology.
The behavior of all energy systems
related to atomic-scale description. With an atomic-level
knowledge of the thermal energy carriers (photon, electron, phonon,
and fluid particle), one is
able to design nano- and micro-structures with
the desired size effects, or to synthesize new materials
with the desired functionalities. Our lab is building and expanding
the understanding of the fundamentals of atomic-level
carrier transport and interactions, and is applying this
knowledge to important applications for energy efficiency and electronics thermal
Current projects fall in two
nanoscale heat conduction, and nano-photonics (including nanoscale thermal radiation).
Projects in the nanoscale heat conduction (or
nano-phononics) category include: (1) high-performance nanostructured
thermoelectric materials for power generation and
thermoelectric refrigeration; (2) thermal transport and thermal
rectification in carbon nanotube and graphene for electronic
thermal management applications; (3) thermal
interface resistance across CNT (or graphene)-metal
interfaces for electronic thermal management applications. Projects in the nano-photonics category include: (4)
Suppression of electron-phonon
coupling in quantum dot solar cell materials for enhanced
efficiency; (5) Enhanced
optical absorption in silicon nanowire arrays for
potentially enhanced solar cell efficiency; (6) Multiscale control of
thermal radiation in ordered array of carbon nanotubes; (7)
enhanced laser cooling of semiconductors and ion-doped
projects involve theoretical, computational, and experimental
components. Currently our lab devotes 2/3 efforts to
theoretical and simulation studies, and 1/3 effort to
experimental work. Theoretical tools include heat transfer,
materials science, quantum mechanics,
solid state physics, optics, and electromagnetic theory. Computational
tools involve multiscale
simulation techniques of nanoscale energy transport,
including molecular dynamics simulations, first principles
simulations, and Boltzmann transport theory. Experiments
include fabrication of nanomaterials and devices, and
characterizations of these materials and devices using
advanced imaging and spectroscopy
techniques. Detailed information of our research can be
We have labs in both the
ME building and the
Birck Nanotechnology Center. We are also associated with
Energy Center at Purdue.
Most Recent Publications:
 Y. Wang, Z.X. Lu, A.K. Roy, and X.L. Ruan, “Effect of
interlayer on interfacial thermal transport and hot electron
cooling in metal-dielectric systems: an electron-phonon
coupling perspective”, J. Appl. Phys. 119, 065103 (2016). [PDF]
 T.L. Feng and X.L. Ruan, “Ultra-Low Thermal
Conductivity in Graphene Nanomesh”, Carbon 101, 107-113
 H. Bao and X.L. Ruan, “Absorption Spectra and
Electron-Vibration Coupling of Ti: Sapphire From First
Principles”, J. Heat Transfer 138, 042702 (2016). [PDF]
 T.L. Feng and X.L. Ruan, “Quantum mechanical prediction
of four-phonon scattering rates and reduced thermal
conductivity of solids”, Phys. Rev. B 93, 045202 (2016). [PDF]
Fang, J.H. Bahk, T.L. Feng, Z. Cheng, A.M.S. Mohammed, X.W.
Wang, X.L. Ruan, A. Shakouri, and Y. Wu, “Thermoelectric
properties of solution-synthesized n-type Bi2Te3
nanocomposites modulated by Se: An experimental and
theoretical study”, Nano Research 9, 117-127 (2016). [PDF]
 T.L. Feng, B. Qiu, and X.L. Ruan, “Coupling between
phonon-phonon and phonon-impurity scattering: A critical
revisit of the spectral Matthiessen's rule”, Phys. Rev. B
92, 235206 (2015). [PDF]
list of publications]
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