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Efficient electrical control of thin-film black phosphorus bandgap.

Abstract：

:Recently rediscovered black phosphorus is a layered semiconductor with promising electronic and photonic properties. Dynamic control of its bandgap can allow for the exploration of new physical phenomena. However, theoretical investigations and photoemission spectroscopy experiments indicate that in its few-layer form, an exceedingly large electric field in the order of several volts per nanometre is required to effectively tune its bandgap, making the direct electrical control unfeasible. Here we reveal the unique thickness-dependent bandgap tuning properties in intrinsic black phosphorus, arising from the strong interlayer electronic-state coupling. Furthermore, leveraging a 10 nm-thick black phosphorus, we continuously tune its bandgap from ∼300 to below 50 meV, using a moderate displacement field up to 1.1 V nm-1. Such dynamic tuning of bandgap may not only extend the operational wavelength range of tunable black phosphorus photonic devices, but also pave the way for the investigation of electrically tunable topological insulators and semimetals.

journal_name

Nat Commun

journal_title

Nature communications

authors

Deng B,Tran V,Xie Y,Jiang H,Li C,Guo Q,Wang X,Tian H,Koester SJ,Wang H,Cha JJ,Xia Q,Yang L,Xia F

doi

10.1038/ncomms14474

subject

Has Abstract

pub_date

2017-04-19 00:00:00

pages

14474

issn

2041-1723

pii

ncomms14474

journal_volume

8

pub_type

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