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How do single and multiple defects interact with each other in a crystal lattice? 


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Single and multiple defects in a crystal lattice interact in various ways depending on their type, distance, and direction. Defect interactions can be attractive or repulsive, influenced by lattice distortion and electron charge redistribution. For instance, in the case of multiple defects like adjacent holes, stress concentration is enhanced based on their proximity, affecting the fatigue strength of the material. Additionally, defects can form stable clusters, leading to phase separation between perfect crystalline structures and defect conglomerates at low temperatures. By tuning external fields, interactions between defects can be controlled, allowing for the engineering of novel phases in quantum systems. Understanding these interactions is crucial for predicting material behavior and designing advanced materials with tailored properties.

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Single defects in a crystal lattice can interact resonantly with periodic lattice, causing energy dissipation. However, by using appropriately tuned acoustic sources, effective friction can be reduced to zero, enabling frictionless motion of lattice defects.
Single and multiple defects in a crystal lattice attract each other, forming stable clusters. By tuning external fields, interactions can transition from attractive to repulsive, enabling the design of novel phases.
Single defects behave individually, while multiple defects interact, coalescing to form a larger single defect in a crystal lattice, impacting fatigue limit evaluations in materials like medium carbon steel.
Single defects in a crystal lattice exhibit strong mutual interactions, as indicated by the title "Quantum defects from single surface exhibit strong mutual interactions." Multiple defects likely interact similarly.

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