From single constituents to correlation: phase transitions in few atom systems

[摘要] The advancements of nanofabrication, together with the control of implantation of individual atoms at nanometric precision, have opened the experimental study of phase transitions of electronic systems constituted by six electrons and less. Here I review the recent advancements made in the field of phase transitions at the few atoms scale, including the discretized version of the Anderson-Mott quantum phase transition and the melting of electrons arranged in a Wigner-like phase into a Fermi glass realized in a Si : X quantum device where X is a donor element. The rise of collective phenomena is directly probed by controlling the distance between few donor atoms. Four atoms are sufficient to observe emergent phenomena such as Hubbard bands instead of single particle behaviour.

[发布机构] Laboratorio Materiali e Dispositivi per la Microelettronica, Consiglio Nazionale Delle Ricerche-IMM, Via Olivetti 2, I-20864 Agrate Brianza, Italy^1

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Collective phenomena;Donor elements;Electronic systems;Emergent phenomenon;Hubbard band;Quantum device;Quantum phase transitions;Single particle