Reflections on the effect of an external flux in surface physics

Curiotto, S.; Leroy, Frédéric; Cheynis, Fabien; Müller, Pierre

doi:10.1016/j.susc.2022.122158

Cited by 3 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the usage of the container with the melt and a capillary between the samples with different step densities results in the growth of the sample with a lower step density due to the sublimation of the sample with a higher step density. As mentioned above, these experimental results are in agreement with the theoretical considerations and Monte Carlo simulations by Curiotto et al [30]. Indeed, according to [30], the sublimation flux from a stepterraced surface is proportional to the atomic step density.…”

Section: Resultssupporting

confidence: 90%

“…As mentioned above, these experimental results are in agreement with the theoretical considerations and Monte Carlo simulations by Curiotto et al [30]. Indeed, according to [30], the sublimation flux from a stepterraced surface is proportional to the atomic step density. Therefore, under annealing in a capillary with different step densities, one should expect sublimation and growth on the surfaces with higher and lower step densities, respectively.…”

Section: Resultssupporting

confidence: 90%

“…In contrast to [28,29], in the present experiments the samples were always kept at the same temperature; so, a quasi-equilibrium state was supposed to be provided. However, in agreement with the recent considerations by Curiotto et al [30], it was shown that the conditions can be shifted from equilibrium towards sublimation or growth, depending on the difference in the vicinality of the two adjacent samples. In the second method, the saturated Ga-As melt was placed at the bottom of the graphite container.…”

Section: Methodssupporting

confidence: 91%

“…The atoms are allowed to hop to adjacent free sites on a terrace, to incorporate into a step or to leave a step, and to desorb from the surface. To maintain the equilibrium, each desorbed atom was replaced by an adsorbed atom deposited on the surface at random positions [30]. For crystal growth, additional atoms are also deposited at a specified rate.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Kinetically driven thermal roughening of semiconductor surfaces: experiment on GaAs and Monte Carlo simulation

Kazantsev¹,

Akhundov²,

Кожухов³

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

We present the results of GaAs annealing experiments in the conditions near equilibrium, which clarify the reasons of the transition from surface smoothing to roughening at temperatures above 650°C. The roughening is due to kinetic instabilities arising under deviation of annealing conditions towards growth or sublimation. These instabilities reveal themselves in appearing islands (for sublimation) and pits (for growth) of multilayer heights and depths, respectively. The islands and pits appear due to the motion of atomic steps through surface spots, at which sublimation and growth are suppressed. Pinning of the steps at these spots also lead to step bunching at surfaces with sufficiently small terrace widths. This explanation is consistent with Monte Carlo simulations of atomic processes on the GaAs surface. The similarity and distinctions in surface roughening under sublimation and growth, along with the role of Schwöbel barrier, are discussed. Annealing experiments in the cavities, which are formed by GaAs substrates with well-controlled atomic step densities enabled us to clarify the roughening mechanisms and to improve the efficiency of GaAs thermal smoothing technique by increasing smoothing temperature up to 775°C.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Section: Methodssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Kinetically driven thermal roughening of semiconductor surfaces: experiment on GaAs and Monte Carlo simulation

Kazantsev¹,

Akhundov²,

Кожухов³

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The model, explained with the help of Figure , is based on water molecules that detach from a droplet, diffuse, and attach to an ice particle. This approach has been employed in contexts different from frost propagation, particularly in surface diffusion studies (see the literature for examples , ).…”

Section: Resultsmentioning

confidence: 99%

Atomistic Description of Interdroplet Ice-Bridge Formation during Condensation Frosting

et al. 2022

View full text Add to dashboard Cite

The propagation of frost in an assembly of supercooled dew droplets takes place by the formation of ice protrusions that bridge ice particles and still-liquid droplets. In this work, we develop a Kinetic Monte Carlo (KMC) model to study the formation kinetics of the ice protrusions. The KMC simulations reproduce well the experimental results reported in the literature. The elongation speed of the ice protrusions does not depend on the droplet size but increases when the interdroplet distance decreases, the temperature increases, or the substrate wettability increases. While 2D diffusion of the water molecules on the substrate surface is sufficient to explain the process kinetics, high 3D (vapor) water-molecule concentration can lead to the development of 3D lateral branches on the ice protrusions. A 1D analytical model based on the water-molecule concentration gradient between a droplet and a nearby ice particle reproduces well the simulation results and highlights the relation between the protrusion elongation kinetics and parameters like the interdroplet distance, the water diffusivity, and the concentration gradient. The bridge-formation time has a quadratic dependence on the droplet-ice distance. Comparing the simulations, the analytical model, and the experimental results of the literature, we conclude that the propagation of frost on a flat substrate in an assembly of supercooled dew droplets with interdroplet spacing larger than about 1 μm is limited by water-molecule diffusivity.

show abstract

Surface thermomigration of 2D voids

Curiotto,

Combe,

Müller

et al. 2024

Applied Physics Letters

View full text Add to dashboard Cite

In a thermal gradient, surface nanostructures have been experimentally observed to move due to thermomigration. However, analytical models that describe the thermomigration force acting on surfaces are still controversial. In this work, we start from a thermodynamic approach based on the Massieu function, which is used to describe thermomigration of single adatoms, to develop an expression for the velocity of thermomigrating 2D holes. The model can be simplified in two limiting cases: (i) When the hole motion is limited by adspecies diffusion, the velocity is independent from the hole size (as in our experiments). (ii) If the hole motion is limited by the attachment or detachment of species to or from steps, then the velocity is proportional to the hole width. We have studied the thermomigration of 2D monatomic deep holes on Si(100) using low energy electron microscopy. From the velocity measurements taken at different temperatures, we find, using our model, that the sum of the migration energy and the adatom creation energy is 1.95 ± 0.16 eV. This value is consistent with those found by other authors, reinforcing the validity of our thermomigration model.

show abstract

Reflections on the effect of an external flux in surface physics

Cited by 3 publications

References 28 publications

Kinetically driven thermal roughening of semiconductor surfaces: experiment on GaAs and Monte Carlo simulation

Kinetically driven thermal roughening of semiconductor surfaces: experiment on GaAs and Monte Carlo simulation

Atomistic Description of Interdroplet Ice-Bridge Formation during Condensation Frosting

Surface thermomigration of 2D voids

Contact Info

Product

Resources

About