Phonon softening and crystallographic orientation of strained graphene studied by Raman spectroscopy.
نویسندگان
چکیده
We present a systematic study of the Raman spectra of optical phonons in graphene monolayers under tunable uniaxial tensile stress. Both the G and 2D bands exhibit significant red shifts. The G band splits into 2 distinct subbands (G(+), G(-)) because of the strain-induced symmetry breaking. Raman scattering from the G(+) and G(-) bands shows a distinctive polarization dependence that reflects the angle between the axis of the stress and the underlying graphene crystal axes. Polarized Raman spectroscopy therefore constitutes a purely optical method for the determination of the crystallographic orientation of graphene.
منابع مشابه
Scanning Raman spectroscopy of graphene antidot lattices: Evidence for systematic p-type doping
We have investigated antidot lattices, which were prepared on exfoliated graphene single layers via electron-beam lithography and ion etching, by means of scanning Raman spectroscopy. The peak positions, peak widths, and intensities of the characteristic phonon modes of the carbon lattice have been studied systematically in a series of samples. In the patterned samples, we found a systematic st...
متن کاملOptical phonons in twisted bilayer graphene with gate-induced asymmetric doping.
Twisted bilayer graphene (tBLG) devices with ion gel gate dielectrics are studied using Raman spectroscopy in the twist angle regime where a resonantly enhanced G band can be observed. We observe prominent splitting and intensity quenching on the G Raman band when the carrier density is tuned away from charge neutrality. This G peak splitting is attributed to asymmetric charge doping in the two...
متن کاملOptical phonons of strained GaAs/GaP quantum wells studied by Raman spectroscopy
We have studied the optical phonons of GaAs quantum wells strained to GaP. The phonon frequencies have been measured by Raman spectroscopy. The results have been compared with calculations based on the linear chain model and the random isoamplitude model. The comparison suggests a certain degree of atomic intermixing at the interfaces, mainly due to a limited but measurable arsenic carry-over d...
متن کاملPhonon dynamics of graphene on metals.
The study of surface phonon dispersion curves is motivated by the quest for a detailed understanding of the forces between the atoms at the surface and in the bulk. In the case of graphene, additional motivation comes from the fact that thermal conductivity is dominated by contributions from acoustic phonons, while optical phonon properties are essential to understand Raman spectra. In this art...
متن کاملPhonon dispersion and quantization tuning of strained carbon nanotubes for flexible electronics
Articles you may be interested in Strain on field effect transistors with single–walled–carbon nanotube network on flexible substrate Electrical and lattice vibrational behaviors of graphene devices on flexible substrate under small mechanical strain Appl. Accurate density functional calculations for the phonon dispersion relations of carbon nanotubes AIP Conf. Graphene and carbon nanotubes are...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 106 18 شماره
صفحات -
تاریخ انتشار 2009