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Title: Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth

Abstract

Understanding surface dynamics during epitaxial film growth is key to growing high-quality materials with controllable properties. X-ray photon correlation spectroscopy (XPCS) using coherent X-rays opens new opportunities for in situ observation of atomic-scale fluctuation dynamics during crystal growth. Here in this paper, we present XPCS measurements of two-dimensional island dynamics during homoepitaxial growth in the layer-by-layer mode. Analysis of the results using two-time correlations reveals a new phenomenon-a memory effect in the arrangement of islands formed on successive crystal layers. Simulations indicate that this persistence in the island arrangements arises from communication between islands on different layers via adatoms. With the worldwide advent of new coherent X-ray sources, the experimental and analysis methods pioneered here will enable broad application of XPCS to observe atomic-scale processes on surfaces.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  4. Sogang Univ., Seoul (Korea). Dept. of Physics
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1530377
Alternate Identifier(s):
OSTI ID: 1532471
Grant/Contract Number:  
AC02-06CH11357; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 6; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ju, Guangxu, Xu, Dongwei, Highland, Matthew J., Thompson, Carol, Zhou, Hua, Eastman, Jeffrey A., Fuoss, Paul H., Zapol, Peter, Kim, Hyunjung, and Stephenson, G. Brian. Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth. United States: N. p., 2019. Web. doi:10.1038/s41567-019-0448-1.
Ju, Guangxu, Xu, Dongwei, Highland, Matthew J., Thompson, Carol, Zhou, Hua, Eastman, Jeffrey A., Fuoss, Paul H., Zapol, Peter, Kim, Hyunjung, & Stephenson, G. Brian. Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth. United States. doi:10.1038/s41567-019-0448-1.
Ju, Guangxu, Xu, Dongwei, Highland, Matthew J., Thompson, Carol, Zhou, Hua, Eastman, Jeffrey A., Fuoss, Paul H., Zapol, Peter, Kim, Hyunjung, and Stephenson, G. Brian. Mon . "Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth". United States. doi:10.1038/s41567-019-0448-1.
@article{osti_1530377,
title = {Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth},
author = {Ju, Guangxu and Xu, Dongwei and Highland, Matthew J. and Thompson, Carol and Zhou, Hua and Eastman, Jeffrey A. and Fuoss, Paul H. and Zapol, Peter and Kim, Hyunjung and Stephenson, G. Brian},
abstractNote = {Understanding surface dynamics during epitaxial film growth is key to growing high-quality materials with controllable properties. X-ray photon correlation spectroscopy (XPCS) using coherent X-rays opens new opportunities for in situ observation of atomic-scale fluctuation dynamics during crystal growth. Here in this paper, we present XPCS measurements of two-dimensional island dynamics during homoepitaxial growth in the layer-by-layer mode. Analysis of the results using two-time correlations reveals a new phenomenon-a memory effect in the arrangement of islands formed on successive crystal layers. Simulations indicate that this persistence in the island arrangements arises from communication between islands on different layers via adatoms. With the worldwide advent of new coherent X-ray sources, the experimental and analysis methods pioneered here will enable broad application of XPCS to observe atomic-scale processes on surfaces.},
doi = {10.1038/s41567-019-0448-1},
journal = {Nature Physics},
number = 6,
volume = 15,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 4, 2020
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