Widely Tunable Bi2Se3/TMD 2D Heterostructures for Write-Read-Erase-Reuse Applications, as well as Oxygen Sensing and Storage

Z. Hennighausen, C. Lane, A. Bansil, S. Kar
Naval Research Laboratory,
United States

Keywords: Bi2Se3, transition metal dichalcogenide, TMD, 2D Materials, heterostructures, data storage, oxygen sensing, oxygen storage, interlayer coupling, charge lattice

Summary:

When 2D materials are vertically stacked, new physics emerges from interlayer coupling and interaction. For example, the photoluminescence intensity and excitonic properties of Bi2Se3/Transition Metal Dichalcogenide (TMD) 2D structures can be finely tuned by manipulating the interlayer coupling. By controllably intercalating and deintercalating oxygen, the interlayer coupling strength can be adjusted higher or lower, thereby allowing for user-defined photoluminescence intensities. Using a focused laser, we show submicron patterns can be written, erased, and reused with high precision, enabling ultra-high dense information storage, as well as oxygen storage applications. We demonstrate this over a wide-range of monolayer TMDs - including an alloy MoSe2-2xS2x - and a wide-range of emission energy values in the visible (1.5 eV < Eph