Giant Phononic Anisotropy and Unusual Anharmonicity of Phosphorene: Interlayer Coupling and Strain Engineering
By Yongqing Cai, Qingqing Ke, Gang Zhang, Y. Feng, V. Shenoy, Yong‐Wei Zhang. 2015
212 citations recorded by the source corpus.
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.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/0c065f7af357d50b0c386d8490275a96ecc30077
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In Materials Chemistry
Citations in the corpus
- Electronic Properties of Phosphorene/Graphene and Phosphorene/Hexagonal Boron Nitride Heterostructures (2015, background): “Interestingly, phosphorene was found to show a giant phononic anisotropy, which is squarely opposite to its electronic counterpart, enabling the asymmetrical transport of electrons/holes and phonons.(47,48)”
- Recent Advances in the Study of Phosphorene and its Nanostructures (2017, background): “phonon–phonon scattering can be neglected.(145) Using first-principles calculations, Ong et al.”