Phys.org November 19, 2024
Researchers in the Republic of Korea investigated Coulomb exchange between distinct electron–hole modes and Floquet states, in two-dimensional semiconductors through a theoretical description of time-resolved and angle-resolved photoemission spectroscopy (tr-ARPES) in an extended Haldane model that included the electron–hole Coulomb interaction. Two branches of novel quantum states were found in the form of bosonic exciton–Floquet composites, which resulted from exchange coupling due to the Coulomb interaction. tr-ARPES could be directly employed for the density matrix element of the biparticle subsystem of photoelectron and hole, and electron–hole entanglement and information could be further explored. According to the researchers their finding suggests a unique platform to study the buildup and dephasing of novel exciton–Floquet composites and to resolve the information carried by them, which would enable the pursuit of new reconfigurable devices based on two-dimensional semiconductors… read more. TECHNICAL ARTICLEÂ
Graphical abstract. Credit: Nano Letters, Vol 24/Issue 42, October 9, 2024