Roman Anufriev

anufriev@iis.u-tokyo.ac.jp

Research

2021 – 2023 · Project Associate Professor at the University of Tokyo

2018 – 2021 · Project Research Associate at the University of Tokyo

2014 – 2018 · PostDoc at the University of Tokyo

2010 – 2013 · PhD at Lyon Nanotechnology Institute (INL)

2009 – 2010 · Master at Saint Petersburg Academic University

Education

Ph.D. · Institut National des Sciences Appliquées (INSA) de Lyon · 2013

Thesis: “Optical properties of III-V nanowire heterostructures grown on silicon substrates”. Supervised by Catherine Bru-Chevallier and Nicolas Chauvin.

M.S. · St. Petersburg Academic University · 2010

Thesis: “Simulation of Tamm plasmon polaritons in multilayered cylindrical structures”. Supervised by Mikhail Kaliteevski. Major: Electronics and microelectronics.

B.S. · St. Petersburg Polytechnic University · 2008

Major: Technical physics.

Skills

  • Nanofabrication methods (EB lithography, RIE, PVD, and other clean-room methods)
  • Time-domain thermoreflectance (TDTR)
  • Brillouin light scattering (BLS) spectroscopy
  • Photoluminescence spectroscopy (PL, Micro-PL, PLE, TR-PL)
  • Electron and atomic force microscopy (AFM)
  • Ray-tracing, FEM, and quantum simulations (Python, Matlab, Comsol, and Nextnano)
  • Background in the solid state physics (semiconductor optics, nanoscale heat transport, phononics)
  • English (Advanced), French (B2), Polish (Beginner), Russian (Native)

More details on the skills are available here.

Grants and awards

2020 · Best Review Award from JSPS

2019 · The Junior Prize of the IPPA

2019 · PRESTO JST grant (€ 300 000)

2018 · Kakenhi JSPS grant (€ 23 000)

2017 · JSAP Young Author Award

2016 · Certificate of merit for “Thermal Engineering Best Paper” from the JSME

2016 · Postdoctoral scholarship of the JSPS (€ 20 000)

Highlighted publications

Full list of publications is available here.


Nanoscale limit of the thermal conductivity in crystalline silicon carbide membranes, nanowires, and phononic crystals

We fabricated single crystalline SiC nanostructures, including nanomembranes, nanowires, and phononic crystals, and systematically studied their thermal properties and phonon mean free path. Our measurements show that the thermal conductivity of nanostructures is several times lower than in bulk and the values scale proportionally to the narrowest dimension of the structures.

Anufriev et al., NPG Asia Materials 14, 35 2022


Ray phononics: thermal guides, emitters, filters, and shields powered by ballistic phonon transport

This conceptual paper introduced ray phononics as an alternative paradigm of heat conduction manipulations. We demonstrated how the directional phonon fluxes occur and how they can be used to create various devices based on ballistic heat conduction. This work is expected to open a new research direction in phononics.

Anufriev and Nomura, Materials Today Physics 15, 100272, 2020


Quasi-ballistic heat conduction due to Lévy phonon flights in silicon nanowires

We experimentally demonstrated how ballistic heat conduction gradually occurs in short nanowires as the temperature is decreased. In contrast with the previous observation, this work reveals a gradual transition from diffusive to ballistic behavior and shows realistic limits of non-diffusive transport. Our modeling also reveals that quasi-ballistic heat conduction is caused by Lévy walk of phonons.

Anufriev et al. ACS Nano 12, 11928, 2018


Heat conduction tuning by wave nature of phonons

Our experiments on ordered and disordered phononic crystals demonstrated that coherent heat conduction occurs only around 4 K and quickly disappears as the temperature is increased. This resulted concluded an almost decade-long debate about the possibility of coherent heat conduction at room temperature.

Maire et al. Science Advances, 3, e1700027, 2017


Heat guiding and focusing using ballistic phonon transport in phononic nanostructures

Our experiments and simulations demonstrated that it is possible to guide and focus heat using ballistic transport of phonons. This work uncovers a mechanism to achieve functionality similar to that of photonic crystals but for heat and without phonon interference.

Anufriev et al. Nature Communications, 8, 15505, 2017


Academic open-source projects

FreePaths - Monte Carlo simulator of phonon and thermal transport.

Angry Reviewer - Online style corrector for academic writing.

Callaway-Holland model - Python implementation of the model for thermal conductivity calculation.


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