Microwave spectroscopy of 2D crystals at millikelvin temperatures.

Microwave spectroscopy is useful in revealing interesting electronic states in solid state matter, especially for detecting low energy excitations that are invisible to conventional probes such as electric transport. Experiments that employing microwave spectroscopy for 2D crystals at millikelvin temperatures are rarely explored. In this talk, I will present our recent efforts in developing an experimental setup and devices for implementing microwave spectroscopy of strongly correlated 2D crystals cooled in a dilution refrigerator and under high magnetic fields, aiming to searching for hidden electronic orders.