Details

Autor(en) / Beteiligte

• Ling, Xi
• Liang, Liangbo
• Huang, Shengxi
• Puretzky, Alexander A
• Geohegan, David B
• Sumpter, Bobby G
• Kong, Jing
• Meunier, Vincent
• Dresselhaus, Mildred S

Titel

Low-Frequency Interlayer Breathing Modes in Few-Layer Black Phosphorus

Ist Teil von

• Nano letters, 2015-06, Vol.15 (6), p.4080-4088

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• As a new two-dimensional layered material, black phosphorus (BP) is a very promising material for nanoelectronics and optoelectronics. We use Raman spectroscopy and first-principles theory to characterize and understand the low-frequency (LF) interlayer breathing modes (<100 cm–1) in few-layer BP for the first time. Using a laser polarization dependence study and group theory analysis, the breathing modes are assigned to Ag symmetry. Compared to the high-frequency (HF) Raman modes, the LF breathing modes are considerably more sensitive to interlayer coupling and, thus, their frequencies show a stronger dependence on the number of layers. Hence, they constitute an effective means to probe both the crystalline orientation and thickness of few-layer BP. Furthermore, the temperature dependence shows that in the temperature range −150 to 30 °C, the breathing modes have a weak anharmonic behavior, in contrast to the HF Raman modes that exhibit strong anharmonicity.