Coherent dynamics of photoinduced nucleation processes

Ishida, Kunio; Nasu, Keiichirō

doi:10.1103/physrevb.76.014302

Cited by 12 publications

(26 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As we discussed in our previous papers [11,12], nonadiabatic transitions between quantized states are important to study the dynamical aspects of photoinduced cooperative phenomena.…”

Section: Models and Methodsmentioning

confidence: 97%

“…Details of the quantization procedure of the vibration mode and the method of calculation is described in Refs. [11] and [13].…”

Section: Models and Methodsmentioning

confidence: 99%

“…where |Φ(t) denotes the solution of the time-dependent Schrödinger equation, makes the dynamical behavior of the initial nucleation processes visible [11,12,13]. Besides, the sum ofÑ ( r, t) over all the molecules…”

Section: Nucleation Dynamics Of Isolated Clusters Of Excited Moleculesmentioning

confidence: 99%

“…These photoinduced cooperative phenomena in condensed matter have brought us fruitful theoretical and experimental problems with nonequilibrium dynamics of excited states, and many studies have been presented to clarify their mechanism[8, 9,10,11,12,13]. In particular, coherent dynamics of the photoinduced cooperative phenomena is relevant to control such cooperativity by designed optical pulses.…”

Section: Introductionmentioning

confidence: 99%

“…Since, however, the dynamical properties of photoinduced phenomena is important to discuss the possibility coherent control of them, it is required to study the coherent dynamics of relaxation processes which lead to the macroscopic structural change, for example. Therefore, in order to understand the dynamics of photoinduced nucleation process in coherent regime, we proposed a model of electron-phonon systems in which nonadiabatic transition is calculated rigorously by quantizing the relevant vibrational modes [11].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Quantum pattern formation dynamics of photoinduced nucleation

Ishida

Nasu

2008

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We study the dynamics of quantum pattern formation processes in molecular crystals which is a concomitant with photoinduced nucleation. Since the nucleation process in coherent regime is driven by the nonadiabatic transition in each molecule followed by the propagation of phonons, it is necessary to take into account the quantum nature of both electrons and phonons in order to pursue the dynamics of the system. Therefore, we employ a model of localized electrons coupled with a quantized phonon mode and solved the time-dependent Schrödinger equation numerically.We found that there is a minimal size of clusters of excited molecules which triggers the photoinduced nucleation process, i.e., nucleation does not take place unless sufficient photoexcitation energy is concentrated within a narrow area of the system. We show that this result means that the spatial distribution of photoexcited molecules plays 1 an important role in the nonlinearity of the dynamics and also of the optical properties observed in experiments. We calculated the conversion ratio, the nucleation rate, and correlation functions to reveal the dynamical properties of the pattern formation process, and the initial dynamics of the photoinduced structural change is discussed from the viewpoint of pattern formation.

show abstract

“…As we discussed in our previous papers [11,12], nonadiabatic transitions between quantized states are important to study the dynamical aspects of photoinduced cooperative phenomena.…”

Section: Models and Methodsmentioning

confidence: 97%

“…Details of the quantization procedure of the vibration mode and the method of calculation is described in Refs. [11] and [13].…”

Section: Models and Methodsmentioning

confidence: 99%

Section: Nucleation Dynamics Of Isolated Clusters Of Excited Moleculesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quantum pattern formation dynamics of photoinduced nucleation

Ishida

Nasu

2008

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

Numerical simulation on the dynamics of photoinduced cooperative phenomena in molecular crystals

Ishida

Nasu

2009

Computer Physics Communications

View full text Add to dashboard Cite

Atomic-scale view of the photoinduced structural transition to form sp3-like bonded order phase in graphite

Inami,

Nishioka,

Kanasaki

2023

Sci Rep

View full text Add to dashboard Cite

Photoexcitation of solids often induces structural phase transitions between different ordered phases, some of which are unprecedented and thermodynamically inaccessible. The phenomenon, known as photoinduced structural phase transition (PSPT), is of significant interest to the technological progress of advanced materials processing and the fundamental understanding of material physics. Here, we applied scanning tunnelling microscopy (STM) to directly characterise the primary processes of the PSPT in graphite to form a sp3-like carbon nano-phase called diaphite. The primary challenge was to provide microscopic views of the graphite-to-diaphite transition. On an atomic scale, STM imaging of the photoexcited surface revealed the nucleation and proliferation processes of the diaphite phase; these were governed by the formation of sp3-like interlayer bonds. The growth mode of the diaphite phase depends strongly on the photon energy of excitation laser light. Different dynamical pathways were proposed to explain the formation of a sp3-like interlayer bonding. Potential mechanisms for photon-energy-dependent growth were examined based on the experimental and calculated results. The present results provide insight towards realising optical control of sp2-to-sp3 conversions and the organisation of nanoscale structures in graphene-related materials.

show abstract

Coherent dynamics of photoinduced nucleation processes

Cited by 12 publications

References 20 publications

Quantum pattern formation dynamics of photoinduced nucleation

Quantum pattern formation dynamics of photoinduced nucleation

Numerical simulation on the dynamics of photoinduced cooperative phenomena in molecular crystals

Atomic-scale view of the photoinduced structural transition to form sp3-like bonded order phase in graphite

Contact Info

Product

Resources

About