Tunable intraband optical conductivity and polarization-dependent epsilon-near-zero behavior in black phosphorus.

Abstract:

:Black phosphorus (BP) offers considerable promise for infrared and visible photonics. Efficient tuning of the bandgap and higher subbands in BP by modulation of the Fermi level or application of vertical electric fields has been previously demonstrated, allowing electrical control of its above-bandgap optical properties. Here, we report modulation of the optical conductivity below the bandgap (5 to 15 μm) by tuning the charge density in a two-dimensional electron gas induced in BP, thereby modifying its free carrier-dominated intraband response. With a moderate doping density of 7 × 1012 cm-2, we were able to observe a polarization-dependent epsilon-near-zero behavior in the dielectric permittivity of BP. The intraband polarization sensitivity is intimately linked to the difference in effective fermionic masses along the two crystallographic directions, as confirmed by our measurements. Our results suggest the potential of multilayer BP to allow new optical functions for emerging photonics applications.

journal_name

Sci Adv

journal_title

Science advances

authors

Biswas S,Whitney WS,Grajower MY,Watanabe K,Taniguchi T,Bechtel HA,Rossman GR,Atwater HA

doi

10.1126/sciadv.abd4623

subject

Has Abstract

pub_date

2021-01-08 00:00:00

issue

2

issn

2375-2548

pii

7/2/eabd4623

journal_volume

7

pub_type

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