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Title: Visible Out-of-plane Polarized Luminescence and Electronic Resonance in Black Phosphorus

Journal Article · · Nano Letters

Black phosphorus (BP) is unique among layered materials because of its homonuclear lattice and strong structural anisotropy. While recent investigations on few-layer BP have extensively explored the in-plane (a, c) anisotropy, much less attention has been given to the out-of-plane direction (b). Here, the optical response from bulk BP is probed using polarization-resolved photoluminescence (PL), photoluminescence excitation (PLE), and resonant Raman scattering along the zigzag, out-of-plane, and armchair directions. An unexpected b-polarized luminescence emission is detected in the visible, far above the fundamental gap. PLE indicates that this emission is generated through b-polarized excitation at 2.3 eV. The same electronic resonance is observed in resonant Raman with the enhancement of the Ag phonon modes scattering efficiency. These experimental results are fully consistent with DFT calculations of the permittivity tensor elements and demonstrate the remarkable extent to which the anisotropy influences the optical properties and carrier dynamics in black phosphorus.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); CNPq; FINEP; CAPES; FAPEMIG; and Brazilian Institute of Science and Technology in Carbon Nanomaterials (INCT)-Nanocarbono; Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC02-76SF00515'; 2018/04926-9; NETGP 508526-17; RGPAS-2019-00050; RGPIN-2016-06666; RGPIN-2019-06545
OSTI ID:
1875696
Journal Information:
Nano Letters, Vol. 22, Issue 7; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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