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Relativistic Mass vs. Invariant Mass: Understanding Mass at High Speeds

In early formulations of special relativity, the concept of relativistic mass was introduced to describe how an object’s mass appears

The Klein paradox is a counterintuitive prediction from relativistic quantum mechanics that describes how particles, such as electrons, behave when

The Dirac equation is a fundamental equation in physics that successfully combines the principles of quantum mechanics with Einstein’s theory

Zitterbewegung, which means “trembling motion” in German, is a predicted rapid oscillatory motion of relativistic particles such as electrons when

Wigner crystals are exotic phases of matter in which electrons arrange themselves into a regular, crystalline pattern due to their

Efimov states are a remarkable quantum phenomenon in which three particles can form a stable bound state—even though none of

Rydberg atoms are atoms in which one or more electrons are excited to very high energy levels, far from the

Quantum dots are nanoscale semiconductor particles that confine electrons (or holes) in all three spatial dimensions. Due to their tiny

Fano resonance is a quantum mechanical phenomenon that occurs when a discrete quantum state (such as a bound electron level)

Feshbach resonances are a powerful tool in atomic physics that allow scientists to tune the interactions between atoms in ultracold