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Title: Nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2];  [3];  [4];  [5];  [6];  [1]
  1. Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125,
  2. Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831,
  3. Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125,
  4. Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831,
  5. Department of Mechanical Engineering, University of California, Riverside, CA 92521,
  6. Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831

Despite the widespread use of silicon in modern technology, its peculiar thermal expansion is not well understood. Adapting harmonic phonons to the specific volume at temperature, the quasiharmonic approximation, has become accepted for simulating the thermal expansion, but has given ambiguous interpretations for microscopic mechanisms. Here, to test atomistic mechanisms, we performed inelastic neutron scattering experiments from 100 K to 1,500 K on a single crystal of silicon to measure the changes in phonon frequencies. Our state-of-the-art ab initio calculations, which fully account for phonon anharmonicity and nuclear quantum effects, reproduced the measured shifts of individual phonons with temperature, whereas quasiharmonic shifts were mostly of the wrong sign. Surprisingly, the accepted quasiharmonic model was found to predict the thermal expansion owing to a large cancellation of contributions from individual phonons.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-03ER46055; AC02-05CH11231
OSTI ID:
1420356
Alternate ID(s):
OSTI ID: 1543904
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 115 Journal Issue: 9; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 64 works
Citation information provided by
Web of Science

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