Discrete breathers in hydrogenated graphene

Liu, Bo; Baimova, Julia A.; Dmitriev, Sergey V.; Wang, Xu; Zhu, Hongwei; Zhou, Kun

doi:10.1088/0022-3727/46/30/305302

Cited by 74 publications

(51 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has been shown that graphene and graphane support DBs [33][34][35][36][37] . The first theoretical studies on DBs in graphene and carbon nanotubes have been done by Japanese researchers [38][39][40][41][42][43] .…”

Section: Introductionmentioning

confidence: 99%

Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving

et al. 2017

View full text Add to dashboard Cite

In the present molecular dynamics study, external ac driving is used at frequencies outside the phonon spectrum to excite gap DBs in uniformly strained graphene nanoribbon. Harmonic displacement or harmonic force is applied to a zigzag atomic chain of graphene. In the former case non-propagating DBs are excited on the atoms next to the driven atoms, while in the latter case the excited DBs propagate along the nanoribbon. The energy transfer along the nanoribbon assisted by the DBs is investigated in detail and the differences between harmonic displacement driving and harmonic force driving are discussed. It is concluded that the amplitude of external driving at out of phonon spectrum frequencies should not necessarily be large to obtain a noticeable energy transfer to the system. Overall, our results suggest that external harmonic driving even at relatively small driving amplitudes can be used to control excitation of DBs and consequently the energy transfer to the system.

show abstract

Section: Introductionmentioning

confidence: 99%

Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving

et al. 2017

View full text Add to dashboard Cite

show abstract

“…В рабо-тах [12][13][14] была показана возможность существования дискретных бризеров с частотами вблизи правого края второй щели [1544, 2932] cm −1 (сильнолокализованных высокоамплитудных продольных колебаний валентных связей C−H). Наличие в другой (низкочастотной) ще-ли спектра дисперсионных кривых краевых фононов позволяет предположить возможность существования у нанолент графана также низкочастотных щелевых бризе-ров -локализованных вдоль и поперек наноленты крае-вых колебаний (локализованных нелинейных колебаний граничных шестиугольников валентных связей C−C).…”

Section: заключениеunclassified

Краевые Колебания Нанолент Графана

Савин¹

2018

Физика Твердого Тела

View full text Add to dashboard Cite

Using the COMPASS force field, natural linear vibrations of graphane (graphene hydrogenated on both sides) nanoribbons are simulated. The frequency spectrum of a graphane sheet consists of three continuous intervals (low-frequency, mid-frequency, and narrow high-frequency) and two gaps between them. The construction of dispersion curves for nanoribbons with a zigzag and chair structure of the edges show that the frequencies of edge vibrations (edge phonons) can be present in the gaps of the frequency spectrum. In the first type of nanoribbons, two dispersion curves are in the low-frequency gap of the spectrum and four dispersion curves in the second gap. These curves correspond to phonons moving only along the nanoribbon edges (the mean depth of their penetration toward the nanoribbon center does not exceed 0.15 nm).

show abstract

“…DBs can be highly localized, e.g., gap DBs are localized practically on a single atom in graphane and in the NaCl family ionic crystals with considerable difference in atomic masses of anions and cations [18][19][20]; in strained graphene DB is localized on a pair of carbon atoms vibrating out-of-phase [21][22][23]. Such DBs are very easy to excite, e.g., by initial displacement of one or two atoms that have large vibration amplitudes.…”

Section: How To Excite a Db?mentioning

confidence: 99%

Discrete breathers in metals and ordered alloys

Dmitriev

2017

NOLTA

View full text Add to dashboard Cite

It has been rigorously proved that nonlinear lattices can support spatially localized and periodic in time vibrational modes called either discrete breathers (DBs) or intrinsic localized modes (ILMs). DB does not radiate its energy because its frequency does not belong to the spectrum of small-amplitude running waves. Discreteness and nonlinearity are often said to be the two major necessary conditions for the existence of DBs. Interatomic interactions are nonlinear and the discovery of DBs in crystals, which are nonlinear lattices at the atomic scale, was just a question of time. The first successful attempt to excite DB in alkali-halide NaI crystal in molecular dynamics simulations dates back to 1997. However, the first report on DBs in pure metals was delayed till 2011. In this review we discuss the reason of this delay, describe the latest results on DBs in pure metals and ordered alloys, and outline the open problems in this area.

show abstract

Discrete breathers in hydrogenated graphene

Cited by 74 publications

References 59 publications

Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving

Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving

Краевые Колебания Нанолент Графана

Discrete breathers in metals and ordered alloys

Contact Info

Product

Resources

About