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Graphene flakes for future transistors

These nanostructures could open new prospects for the development of innovative devices thanks to quantum effects and unique magnetic properties

Date:
March 14, 2018
Source:
Scuola Internazionale Superiore di Studi Avanzati
Summary:
Tiny and very promising for possible applications in the field of nanoelectronics: they are the graphene nanoflakes. These hexagonal shaped nanostructures would allow to exploit quantum effects to modulate the current flow. Thanks to their intrinsic magnetic properties, they could also represent a significant step forward in the field of spintronics, which is based on the electron spin.
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FULL STORY

Tiny and very promising for possible applications in the field of nanoelectronics: they are the graphene nanoflakes studied by a SISSA's team and protagonists of a study recently published in theNano Letters日报》。这些六边形的形状的纳米结构是ld allow to exploit quantum effects to modulate the current flow. Thanks to their intrinsic magnetic properties, they could also represent a significant step forward in the field of spintronics, which is based on the electron spin. The study, conducted by a theoretical analysis and simulations at the computer, was led by Massimo Capone, recently appointed Outstanding Referee byPhysical Review Letters,《美国物理ociety.

“我们已经能够观察到两个关键的现象analysing the properties of graphene nanoflakes. Both are of great interest for possible future applications" explain Angelo Valli and Massimo Capone, authors of the study together with Adriano Amaricci and Valentina Brosco. The first phenomenon deals with the so-called interference between electrons and is a quantum phenomenon: "In nanoflakes, the electrons interfere with each other in a "destructive" manner if we measure the current in a certain configuration. This means that there is no transmission of current. This is a typically quantum phenomenon, which only occurs at very reduced sizes. By studying the graphene flakes we have understood that it is possible to bring this phenomenon to larger systems, therefore into the nano world and on a scale in which it is observable and can be exploited for possible uses in nanoelectronics." The two researchers explain that in what are called "Quantum interference transistors" destructive interference would be the "OFF" status. For the "ON" status, they say it is sufficient to remove the conditions for interference, thereby enabling the current to flow.

Magnetism and spintronics

But there's more. In the study, the researchers demonstrated that the nanoflakes present new magnetic properties which are absent, for example, in an entire sheet of graphene: "The magnetism emerges spontaneously at their edges, without any external intervention. This enables the creation of a spin current." The union between the phenomena of quantum interference and of magnetism would allow to obtain almost complete spin polarization, with a huge potential in the field of spintronics, explain the researchers. These properties could be used, for example, in the memorising and processing information technologies, interpreting the spin as binary code. The electron spin, being quantised and having only two possible configurations (which we could call "up" and "down"), is very well suited for this kind of implementation.

Next step: the experimental test

To improve the efficiency of the possible device and the percentage of current polarization the researchers have also developed a protocol that envisages the interaction of the graphene flakes with a surface made of nitrogen and boron. "The results obtained are really interesting. This evidence now awaits the experimental test, to confirm what we have theoretically predicted" concludes Massimo Capone, head of the research and recently awarded the title of Outstanding Referee by the American Physical Society journal; in this way, each year, the journal indicates the male and female scientists who have distinguished themselves for their expertise in collaborating with the journal.

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Journal Reference:

  1. Angelo Valli, Adriano Amaricci, Valentina Brosco, Massimo Capone.Quantum Interference Assisted Spin Filtering in Graphene Nanoflakes.Nano Letters, 2018; 18 (3): 2158 DOI:10.1021/acs.nanolett.8b00453

Cite This Page:

Scuola Internazionale Superiore di Studi Avanzati. "Graphene flakes for future transistors." ScienceDaily. ScienceDaily, 14 March 2018. /releases/2018/03/180314144959.htm>.
Scuola Internazionale Superiore di Studi Avanzati. (2018, March 14). Graphene flakes for future transistors.ScienceDaily. Retrieved September 23, 2023 from www.koonmotors.com/releases/2018/03/180314144959.htm
Scuola Internazionale Superiore di Studi Avanzati. "Graphene flakes for future transistors." ScienceDaily. www.koonmotors.com/releases/2018/03/180314144959.htm (accessed September 23, 2023).

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