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Title: Quantitative relationship between polarization differences and the zone-averaged shift photocurrent

Abstract

A relationship is derived between differences in electric polarization between bands and the “shift vector” that controls part of a material's bulk photocurrent, then demonstrated in several models. Electric polarization has a quantized gauge ambiguity and is normally observed at surfaces via the surface charge density, while shift current is a bulk property and is described by shift vector gauge invariant at each point in momentum space. They are connected because the same optical transitions that are described in shift currents pick out a relative gauge between valence and conduction bands. We also discuss subtleties arising when there are points at the Brillouin zone where optical transitions are absent. Finally, we conclude that two-dimensional materials with significant interband polarization differences should have high bulk photocurrent, meaning that the modern theory of polarization can be used as a straightforward way to search for bulk photovoltaic material candidates.

Authors:
 [1];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1523841
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Fregoso, Benjamin M., Morimoto, Takahiro, and Moore, Joel E. Quantitative relationship between polarization differences and the zone-averaged shift photocurrent. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.075421.
Fregoso, Benjamin M., Morimoto, Takahiro, & Moore, Joel E. Quantitative relationship between polarization differences and the zone-averaged shift photocurrent. United States. doi:10.1103/PhysRevB.96.075421.
Fregoso, Benjamin M., Morimoto, Takahiro, and Moore, Joel E. Wed . "Quantitative relationship between polarization differences and the zone-averaged shift photocurrent". United States. doi:10.1103/PhysRevB.96.075421. https://www.osti.gov/servlets/purl/1523841.
@article{osti_1523841,
title = {Quantitative relationship between polarization differences and the zone-averaged shift photocurrent},
author = {Fregoso, Benjamin M. and Morimoto, Takahiro and Moore, Joel E.},
abstractNote = {A relationship is derived between differences in electric polarization between bands and the “shift vector” that controls part of a material's bulk photocurrent, then demonstrated in several models. Electric polarization has a quantized gauge ambiguity and is normally observed at surfaces via the surface charge density, while shift current is a bulk property and is described by shift vector gauge invariant at each point in momentum space. They are connected because the same optical transitions that are described in shift currents pick out a relative gauge between valence and conduction bands. We also discuss subtleties arising when there are points at the Brillouin zone where optical transitions are absent. Finally, we conclude that two-dimensional materials with significant interband polarization differences should have high bulk photocurrent, meaning that the modern theory of polarization can be used as a straightforward way to search for bulk photovoltaic material candidates.},
doi = {10.1103/PhysRevB.96.075421},
journal = {Physical Review B},
number = 7,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

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Cited by: 12 works
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