# Ground state cooling of nanomechanical resonators by electron transport

## TL;DR

This paper proposes two theoretical methods to achieve ground-state cooling of nanomechanical resonators via electron transport, using quantum dots with different contact configurations, advancing control of quantum mechanical vibrations.

## Contribution

It introduces two novel theoretical approaches for cooling nanomechanical resonators to their ground state through electron transport in quantum dot systems.

## Key findings

- Ground-state cooling is feasible with current technology.
- Both spin-polarised and normal-metal/superconductor configurations can achieve cooling.
- The methods are applicable to suspended carbon nanotube quantum dots.

## Abstract

We discuss two theoretical proposals for controlling the nonequilibrium steady state of nanomechanical resonators using quantum electronic transport. Specifically?, we analyse two approaches to achieve the ground-state cooling of the mechanical vibration coupled to a quantum dot embedded between (i) spin-polarised contacts or (ii) a normal metal and a superconducting contact. Assuming a suitable coupling between the vibrational modes and the charge or spin of the electrons in the quantum dot, we show that ground-state cooling of the mechanical oscillator is within the state of the art for suspended carbon nanotube quantum dots operating as electromechanical devices.