Artificial atomic scale materials: Discovering how electrons fatten!

A single and isolated electron has a clear electrical charge, magnetic moment and mass, and its free movement can be precisely predicted. Spanish scientists fabricated a nanoscale artificial material manipulating atoms one after the other and discovered that electrons around are very heavier. Heavy electrons are promising particles which endow of new functionalities to novel materials.
Source: EurekaAlert, https://www.eurekalert.org