Temperature Measurement by a Nanoscale Electron Probe Using Energy Gain and Loss Spectroscopy
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Protochips Company, Morrisville, NC (United States)
- Nion Company, Kirkland, WA (United States)
Heat dissipation in integrated nanoscale devices is a major issue that requires the development of nanoscale temperature probes. In this paper, 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 ~1600 K. 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.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; McMinn Endowment; USDOE
- Grant/Contract Number:
- FG02-09ER46554; AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1597878
- Alternate ID(s):
- OSTI ID: 1423505; OSTI ID: 1544311; OSTI ID: 1784204
- Journal Information:
- Physical Review Letters, Vol. 120, Issue 9; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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