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Title: Shift vector as the geometric origin of beam shifts
Authors: Shi, Li-Kun
Song, Justin Chien Wen
Keywords: Science::Physics
Issue Date: 2019
Source: Shi, L.-K., & Song, J. C. W. (2019). Shift vector as the geometric origin of beam shifts. Physical Review B, 100(20), 201405-. doi:10.1103/PhysRevB.100.201405
Journal: Physical Review B 
Abstract: Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts are lateral and transverse displacements of a wavepacket reflecting off a surface. A dramatic real-space manifestation of wavepacket phases, they have traditionally been analyzed in a model dependent fashion. Here we argue that GH and IF shifts admit a general geometrical description and arise from a gauge invariant geometric phase. In particular, we show GH/IF shifts can be naturally captured by a shift vector, analogous to the shift vector from shift currents in the bulk photovoltaic effect. Employing Wilson loops to visualize the scattering processes contributing to the shift vector, we separate the shift into an intrinsic (depends solely on the system bulk) and an extrinsic part. This enables to establish a clear model-independent link between symmetry and the presence/absence of intrinsic and extrinsic GH/IF shifts.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.100.201405
Schools: School of Physical and Mathematical Sciences 
Organisations: Institute of High Performance Computing, A*STAR
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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