Simulation of Topological Transport of Colloidal Particle Assemblies above Magnetic Patterns

التفاصيل البيبلوغرافية
العنوان: Simulation of Topological Transport of Colloidal Particle Assemblies above Magnetic Patterns
المؤلفون: Ernst, Adrian
بيانات النشر: University of Bayreuth, 2023.
سنة النشر: 2023
مصطلحات موضوعية: soft matter, topological transport, magnetic pattern, simulation
الوصف: This cumulative thesis studies the topological transport of colloidal particles subject to an external magnetic field that changes its direction along a loop. The paramagnetic colloidal particles respond by moving on top of periodic magnetic patterns. I investigate five physical questions for various different situations using Brownian Dynamics simulations. The simulations are corroborated by experiments from other members in my group. I show how to build an adiabatic topologically protected discrete time crystal with three colloidal particles that interact via dipolar interactions and reside on a flower shaped periodic pattern. I extend this motive to various space time crystallines structures. I discuss the difference between a topologically protected and a geometric form of transport. I show how the transport changes from topological toward geometrical as a function of the particle number in an ensemble of several colloidal particles per unit cell. Dipolar interactions enforce the assembly of $n$ colloidal particles into a biped. I developed a topological protected polyglot programming of the biped walking on square patterns that lets bipeds of different length simultaneously walk into different predefined directions. I analyze the walking on square and hexagonal patterns with the center of mass gauge and the instantaneous center of rotation gauge, which allows me to decompose the motion into passive and active components. Finally at non-adiabatic speeds of driving I show how hydrodynamic interaction suppresses passive motion, stalls single colloidal particles unless still active bipeds assist their passive motion.
اللغة: English
DOI: 10.15495/epub_ubt_00006879
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::ccf87f8f867e8b44f72da52757b95054
رقم الأكسشن: edsair.doi...........ccf87f8f867e8b44f72da52757b95054
قاعدة البيانات: OpenAIRE
الوصف
DOI:10.15495/epub_ubt_00006879