Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device.

ABSTRACT: A Mott insulator sometimes induces unconventional superconductivity in its neighbors when doped and/or pressurized. Because the phase diagram should be strongly related to the microscopic mechanism of the superconductivity, it is important to obtain the global phase diagram surrounding the Mott insulating state. However, the parameter available for controlling the ground state of most Mott insulating materials is one-dimensional owing to technical limitations. Here, we present a two-dimensional ground-state mapping for a Mott insulator using an organic field-effect device by simultaneously tuning the bandwidth and bandfilling. The observed phase diagram showed many unexpected features such as an abrupt first-order superconducting transition under electron doping, a recurrent insulating pha

SUBMITTER: Kawasugi Y 

PROVIDER: S-EPMC6510553 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature