Semiconductor heterostructures for quantum devices

Le informazioni sono disponibili nella versione in  Link identifier #identifier__127294-1Link identifier #identifier__132269-1Italiano

We investigate the fundamental properties and the possible applications of quantum structures made of group IV semiconductors such silicon, germanium, tin and carbon. By controlling the deposition of the materials at the atomic-scale, we can realize heterostructures in which the charge carriers can be confined in nm-thick wells and boxes. In this way it is possible to  control and engineer the carrier properties exploiting all the peculiarity of  quantum mechanics.

The current research activity is focused on:

• The realization of a quantum cascade laser based on GeSi that exploits the transitions of electrons between quantum confined states in conduction band for light emission in the THz range. This activity is funded by the EC-FET OPEN project FLASH, coordinated by Prof. M. De Seta.
• The realization of silicon-based q-bits, the nanodevice at the basis of a quantum computer. In this approach one aims at controlling, manipulating and reading the spin state of electrons confined in nm-wide quantum dots made of silicon, germanium and their alloys.
  

  

Links

Link identifier #identifier__172674-2https://www.flash-project.eu/

Highlight

• THz intersubband electroluminescence from n-type Ge/SiGe quantum cascade structures
  Link identifier #identifier__157197-3https://aip.scitation.org/doi/10.1063/5.0041327
  
• Controlled electron-state coupling in asymmetric Ge/GeSi multi-quantum well
  Link identifier #identifier__138354-4https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.014003
• Gate-controlled quantum dots and superconductivity in planar germanium
  Link identifier #identifier__131747-5https://www.nature.com/articles/s41467-018-05299-x

Members

• Link identifier #identifier__62728-6Monica De Seta
• Link identifier #identifier__165443-7Luciana Di Gaspare
• Link identifier #identifier__125388-8Luca Persichetti
• Link identifier #identifier__163099-9Giovanni Capellini
• Chiara Ciano (Ph. D)

Collaborations

• Università La Sapienza
• CNR-IFN; CNR-IMM; CNR-SPIN
• Università Milano Bicocca
• LNESS-Politecnico Milano
• Università di Pisa
• IHP Leibniz Institut Innovation for High Performance Microelectronics-(Ger)
• Helmotz-Zentrum Dresden-Rossendorf (Ger)
• Forschungszentrum Juelich (Ger);
• University of Glasgow (UK)
• ETH Zürich (CH)
• NextNano(Ger)
• TU-Delft (NL)