Full Momentum and Energy Resolved Spectral Function of a 2D Electronic System: Part II

We use a new momentum- and energy- resolved tunneling spectroscopic method (MERTS) for studying a 2D electron system for high-quality semiconducting structures [1]. It provides a direct high-resolution and high-fidelity probe of the dispersion and dynamics of the interacting 2D electron system. Using this technique, we uncover signatures of many-body effects involving electron-phonon interactions, plasmons, polarons with unprecedented resolution. When a perpendicular magnetic field is applied, the spectra evolve into discrete Landau levels. The massively degenerate electronic states strongly interact with nearly dispersionless LO-phonons and give rise to a novel phonon analog of the vacuum Rabi splitting in atomic systems. I will discuss how this technique will be instrumental to probe emergent quantum phases in the quantum Hall limit, such as stripe, bubble phases, and fractional quantum Hall states. *[1] J. Jang, H. M. Yoo, L. N. Pfeiffer, K. West, K. W. Baldwin, and R. C. Ashoori, Science (Accepted, 2017)