Piezo-driven sample rotation system with ultra-low electron temperature

TL;DR

This paper presents a piezo-driven sample rotation system capable of operating at ultra-low temperatures around 25 mK, enabling precise tilt control in magnetic field experiments while maintaining extremely low electron temperatures.

Contribution

The authors develop a specialized piezo-driven rotation system with enhanced thermal contacts, allowing operation at ultra-low temperatures and low electron temperatures for advanced quantum transport studies.

Findings

Sample cooled to 25 mK with customized thermal links.

Electron temperature also reduced to 25 mK using homemade filters.

Demonstrated tilt-induced localization and delocalization in 2D electron gas.

Abstract

Piezo-driven rotator is convenient for tilted magnetic field experiments due to its precise angle control. However, the rotator itself and the sample mounted on it are difficult to be cooled down because of extra heat leaks and presumably bad thermal contacts from the piezo. Here, we report a piezo-driven sample rotation system designed for ultra-low temperature environment. The sample, as well as the rotating sample holder, can be cooled to as low as 25 mK by customized thermal links and thermal contacts. More importantly, the electron temperature in the electrical transport measurements can also be cooled down to 25 mK with the help of home-made filters. To demonstrate the application of our rotation system at ultra-low electron temperature, a measurement revealing tilt-induced localization and delocalization in the second Landau level of two-dimensional electron gas is provided.