Dynamics of lattice random walk within regions composed of different media and interfaces
Dynamics of lattice random walk within regions composed of different media and interfaces
复制标题
由不同介质和界面组成的区域内晶格随机游走的动力学
DOI:
10.1088/1742-5468/aca8f9
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Das D
中科院分区:
文献类型:
--
作者:
Das D
We study the lattice random walk dynamics in a heterogeneous space of two media separated by an interface and having different diffusivity and bias. Depending on the position of the interface, there exist two exclusive ways to model the dynamics:(a) Type A dynamics whereby the interface is placed between two lattice points, and (b) Type B dynamics whereby the interface is placed on a lattice point. For both types, we obtain exact results for the one-dimensional generating function of the Green's function or propagator for the composite system in unbounded domain as well as domains confined with reflecting, absorbing, and mixed boundaries. For the case with reflecting confinement in the absence of bias, the steady-state probability shows a step-like behavior for the Type A dynamics, while it is uniform for the Type B dynamics. We also derive explicit expressions for the first-passage probability and the mean first-passage time, and compare the hitting time dependence to a single target. Finally, considering the continuous-space continuous-time limit of the propagator, we obtain the boundary conditions at the interface. At the interface, while the flux is the same, the probability density is discontinuous for Type A and is continuous for Type B. For the latter we derive a generalized version of the so-called leather boundary condition in the appropriate limit.
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DOI:
10.1088/1751-8121/ac8587
发表时间:
2022-07
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
作者:
L. Giuggioli;Seeralan Sarvaharman
通讯作者:
L. Giuggioli;Seeralan Sarvaharman
DOI:
10.1557/proc-644-l2.1
发表时间:
2000
期刊:
MRS Proceedings
影响因子:
--
作者:
Franz Faupel;K. Rätzke;H. Ehmler;P. Klugkist;V. Zöllmer;C. Nagel;A. Rehmet;A. Heesemann
通讯作者:
A. Heesemann
DOI:
10.1016/j.ijheatmasstransfer.2009.08.012
发表时间:
2009
影响因子:
5.2
作者:
R. Hickson;S. Barry;G. Mercer
通讯作者:
G. Mercer
DOI:
10.1016/j.matcom.2017.05.008
发表时间:
2018
期刊:
Math. Comput. Simul.
影响因子:
--
作者:
A. Lejay
通讯作者:
A. Lejay
影响因子:
2.5
作者:
Moutal, Nicolas;Grebenkov, Denis
通讯作者:
Grebenkov, Denis