Myron Strongin Seminar Series

"Hund physics landscape of two-orbital system"

Presented by Sangkook Choi, BNL

Monday, May 10, 2021, 1:30 pm — Bldg. 734 (Virtual)

Motivated by the recent discovery of superconductivity in infinite-layer nickelates RE1−δSrδNiO2 (RE=Nd, Pr), we study the role of Hund's coupling J in a quarter-filled two-orbital Hubbard model which has been on the periphery of the attention. A region of negative effective Coulomb interaction of this model is revealed to be differentiated from three- and five-orbital models in their typical Hund's metal active fillings. We identify distinctive regimes including four different correlated metals, one of which stems from the proximity to a Mott insulator while the other three, which we call "intermediate" metal, weak Hund's metal, and valence-skipping metal, from the effect of J being away from Mottness. Defining criteria characterizing these metals are suggested, establishing the existence of Hund's metallicity in two-orbital systems.

Hosted by: Weiguo Yin

Join Videoconference

16445  |  INT/EXT  |  Events Calendar

 

Not all computers/devices will add this event to your calendar automatically.

A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.

Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.