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 Advjournal_title
Science advancesauthors
Biswas S,Whitney WS,Grajower MY,Watanabe K,Taniguchi T,Bechtel HA,Rossman GR,Atwater HAdoi
10.1126/sciadv.abd4623subject
Has Abstractpub_date
2021-01-08 00:00:00issue
2issn
2375-2548pii
7/2/eabd4623journal_volume
7pub_type
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