Particle physicists can hardly invent new physical systems but only to discover the already existing matter and energy world. Condensed matter physicists tend to create their own systems to meet fundamental intelligent challenges and practical ends. The as-created new physical systems are surely immense and the underlying physics are also diverse, but the mathematical models seem not so diverse: it is frequently the case that the model constructed for one system may be transplanted to describe another system, with proper interpretation of the symbols. In other words, there exists some kind of universality. This scenario offers opportunities for both theorists and experimentalists: (1) the theorists can make predictions about system A via the knowledge of system B if A and B are found sharing the same mathematical structure; while (2) the experimentalists can simulate system A by measuring system B. Such possibility drives the emergence of a host of artificial systems. The following is a list:
(1) p-n junction and transistors;
(2) 2DEG;
(3) Optical lattice and Ultra-cold atoms;
(4) Photonic crystals;
(5) Metamaterials;
(6) Circuit QED;
(7) Cavity QED;
(8) Trapped ions;
(9) Graphene, and CNTs;
(10) Topological insulators;
(11) ...
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