New phases in strongly driven 2D

Quantum phases are typically probed at very low excitations, e.g., low temperatures, low currents, and low frequencies. While higher excitations can lead to the destruction of many quantum phases, they can also induce new phases, such as non-Fermi liquids and even re-entrant superconductivity. Here, I will primarily focus on the case of conventional two-dimensional electron systems with high to very mobilities. By increasing the excitation, particularly the driving current, a slew of new phases emerges, such as electron hydrodynamics and supersonic phonon emission, as prime examples. I will review the various phases that are surfacing in different excitation regimes and put them in the context of our current understanding