bitstream/item/219766/1/TS2020-010-dis-MEPA.pdfDissertação (Mestrado em Química) - Universidade Federal do Ceará, Centro de Ciências, Fortaleza. Coorientador: Renato Carrhá Leitã

Alexander A. Puretzky (1302459)

Bobby G. Sumpter (537235)

David B. Geohegan (1373514)

Jing Kong (531041)

Liangbo Liang (1395112)

Mildred S. Dresselhaus (1395118)

Shengxi Huang (1395109)

Vincent Meunier (1287186)

Xi Ling (1370202)

Nano Letters

arXiv

Xi Ling

Liangbo Liang

Shengxi Huang

Alexander A. Puretzky

David B. Geohegan

Bobby G. Sumpter

Jing Kong

Vincent Meunier

Mildred S. Dresselhaus

Crossref

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

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[superscript –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 A[subscript g] 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.National Science Foundation (U.S.) (DMR-1004147)National Science Foundation (U.S.) (DE-SC0001299

Ling, Xi

Liang, Liangbo

Huang, Shengxi

Puretzky, Alexander A.

Geohegan, David B.

Sumpter, Bobby G.

Kong, Jing

Meunier, Vincent

Dresselhaus, Mildred

DSpace@MIT

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<sup>–1</sup>) in few-layer BP for the first time. Using
a laser polarization dependence study and group theory analysis, the
breathing modes are assigned to A<sub>g</sub> 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

FigShare

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

Dissertação (Mestrado em Química) - Universidade Federal do Ceará, Centro de Ciências, Fortaleza. Coorientador: Renato Carrhá Leitã

ALBUQUERQUE, M. E. P.

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