Temperature Measurement by a Nanoscale Electron Probe Using Energy Gain and Loss Spectroscopy

Juan Carlos Idrobo, Andrew R. Lupini, Tianli Feng, Raymond R. Unocic, Franklin S. Walden, Daniel S. Gardiner, Tracy C. Lovejoy, Niklas Dellby, Sokrates T. Pantelides, and Ondrej L. Krivanek
Phys. Rev. Lett. 120, 095901 – Published 2 March 2018
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Abstract

Heat dissipation in integrated nanoscale devices is a major issue that requires the development of nanoscale temperature probes. Here, we report the implementation of a method that combines electron energy gain and loss spectroscopy to provide a direct measurement of the local temperature in the nanoenvironment. Loss and gain peaks corresponding to an optical-phonon mode in boron nitride were measured from room temperature to 1600K. Both loss and gain peaks exhibit a shift towards lower energies as the sample is heated up. First-principles calculations of the temperature-induced phonon frequency shifts provide insights into the origin of this effect and confirm the experimental data. The experiments and theory presented here open the doors to the study of anharmonic effects in materials by directly probing phonons in the electron microscope.

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  • Received 23 October 2017
  • Revised 12 January 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.095901

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Juan Carlos Idrobo1,*, Andrew R. Lupini2,†, Tianli Feng3,2, Raymond R. Unocic1, Franklin S. Walden4, Daniel S. Gardiner4, Tracy C. Lovejoy5, Niklas Dellby5, Sokrates T. Pantelides3,2, and Ondrej L. Krivanek5

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
  • 4Protochips Company, 3800 Gateway Centre Boulevard, Suite 306, Morrisville, North Carolina 27560, USA
  • 5Nion Company, 11511 NE 118th Street, Kirkland, Washington 98034, USA

  • *idrobojc@ornl.gov
  • arl1000@ornl.gov

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Issue

Vol. 120, Iss. 9 — 2 March 2018

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