Strong Modulation of Optical Properties in Black Phosphorus through Strain-Engineered Rippling

详细信息    查看全文

• 作者：Jorge Quereda ; Pablo San-Jose ; Vincenzo Parente ; Luis Vaquero-Garzon ; Aday J. Molina-Mendoza ; Nicolás Agraït ; Gabino Rubio-Bollinger ; Francisco Guinea ; Rafael Roldán ; Andres Castellanos-Gomez
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：16
• 期：5
• 页码：2931-2937
• 全文大小：471K
• 年卷期：0
• ISSN：1530-6992

文摘

Controlling the bandgap through local-strain engineering is an exciting avenue for tailoring optoelectronic materials. Two-dimensional crystals are particularly suited for this purpose because they can withstand unprecedented nonhomogeneous deformations before rupture; one can literally bend them and fold them up almost like a piece of paper. Here, we study multilayer black phosphorus sheets subjected to periodic stress to modulate their optoelectronic properties. We find a remarkable shift of the optical absorption band-edge of up to ∼0.7 eV between the regions under tensile and compressive stress, greatly exceeding the strain tunability reported for transition metal dichalcogenides. This observation is supported by theoretical models that also predict that this periodic stress modulation can yield to quantum confinement of carriers at low temperatures. The possibility of generating large strain-induced variations in the local density of charge carriers opens the door for a variety of applications including photovoltaics, quantum optics, and two-dimensional optoelectronic devices.