Isolated quantum systems generically exhibit ergodicity i.e., any given initial state evolves to a thermal state at late times. This property is guaranteed by a set of conditions known as the Eigenstate Thermalization Hypothesis (ETH). There are two well-known kinds of systems which violate ETH completely: Integrable systems and Many-Body Localized systems, where quantum states break ergodicity. In this talk I will describe a relatively novel type of systems which support ETH-satisfying eigenstates as well as ETH-violating ones known as "Quantum Scars”. I will give a brief introduction into the topic and discuss a recent progress in the field.
