Giant Phononic Anisotropy and Unusual Anharmonicity of Phosphorene: Interlayer Coupling and Strain Engineering

被引:218
作者
Cai, Yongqing [1 ]
Ke, Qingqing [2 ]
Zhang, Gang [1 ]
Feng, Yuan Ping [3 ]
Shenoy, Vivek B. [4 ]
Zhang, Yong-Wei [1 ]
机构
[1] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore
[2] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore
[3] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
[4] Univ Penn, Sch Engn & Appl Sci, Philadelphia, PA 19104 USA
基金
美国国家科学基金会;
关键词
BLACK PHOSPHORUS; TRANSPORT ANISOTROPY; THERMAL-PROPERTIES; RAMAN; GRAPHENE; PHOTOLUMINESCENCE; SPECTROSCOPY; MODULATION; MOBILITY; CRYSTAL;
D O I
10.1002/adfm.201404294
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Phosphorene, an emerging elemental 2D direct band gap semiconductor with fascinating structural and electronic properties distinctively different from other 2D materials such as graphene and MoS2, is promising for novel nanoelectronic and optoelectronic applications. Phonons, as one of the most important collective excitations, are at the heart of the device performance, as their interactions with electrons and photons govern the carrier mobility and light-emitting efficiency of the material. Here, through a detailed first-principles study, it is demonstrated that monolayer phosphorene exhibits a giant phononic anisotropy, and remarkably, this anisotropy is squarely opposite to its electronic counterpart and can be tuned effectively by strain engineering. By sampling the whole Brillouin zone for the monolayer phosphorene, several "hidden" directions are found, along which small-momentum phonons are "frozen" with strain and possess the smallest degree of anharmonicity. Unexpectedly, these "hidden" directions are intrinsically different from the usually-studied armchair and zigzag directions. Light is also shed on the anisotropy of interlayer coupling of few-layer phosphorene by examining the rigid-layer vibrations. These highly anisotropic and strain-tunable characteristics of phosphorene offer new possibilities for its applications in thermal management, thermoelectronics, nanoelectronics, and phononics.
引用
收藏
页码:2230 / 2236
页数:7
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