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Title: Crystal truncation rods from miscut surfaces with alternating terminations

Journal Article · · Physical Review B
ORCiD logo [1];  [2];  [3];  [4];  [4];  [5];  [4]; ORCiD logo [4]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); Lumileds Lighting Co., San Jose, CA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
  3. Northern Illinois Univ., DeKalb, IL (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
  5. Lake Forest College, Lake Forest, IL (United States)

Miscut surfaces of layered crystals can exhibit a stair-like sequence of terraces having periodic variation in their atomic structure. For hexagonal close-packed and related crystal structures with an αβαβ stacking sequence, there have been long-standing questions regarding how the differences in adatom attachment kinetics at the steps separating the terraces affect the fractional coverage of α vs. β termination during crystal growth. To demonstrate how surface X-ray scattering can help address these questions, we develop a general theory for the intensity distributions along crystal truncation rods (CTRs) for miscut surfaces with a combination of two terminations. We consider half-unit-cell-height steps, and variation of the coverages of the terraces above each step. Example calculations are presented for the GaN (0001) surface with various reconstructions. These show which CTR positions are most sensitive to the fractional coverage of the two terminations. We compare the CTR profiles for exactly oriented surfaces to those for vicinal surfaces having a small miscut angle, and investigate the circumstances under which the CTR profile for an exactly oriented surface is equal to the sum of the intensities of the corresponding family of CTRs for a miscut surface.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1774158
Journal Information:
Physical Review B, Vol. 103, Issue 12; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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