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Superconducting Proximity Effect in ...

Huang, Ko-Fan,

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Superconducting Proximity Effect in Graphene /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Superconducting Proximity Effect in Graphene // Ko-Fan Huang.
作者:	Huang, Ko-Fan,
面頁冊數:	1 electronic resource (191 pages)
附註:	Source: Dissertations Abstracts International, Volume: 82-11, Section: B.
Contained By:	Dissertations Abstracts International82-11B.
標題:	Condensed matter physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28452542
ISBN:	9798597059822

Superconducting Proximity Effect in Graphene /
Huang, Ko-Fan,

Superconducting Proximity Effect in Graphene /Ko-Fan Huang. - 1 electronic resource (191 pages)

Source: Dissertations Abstracts International, Volume: 82-11, Section: B.

Graphene is a popular candidate when it comes to the study of the superconductivity proximity effect. However, experiments have mainly been focusing on the transport behavior in two-terminal Josephson junctions. This dissertation presents unconventional transport experiments which study aspects of the proximity effect that were previously unexplored. The first experiment investigates systematically the graphene (G) - superconductor (S) hybrid system with a controllable interfacial barrier strength. We demonstrate how the Andreev process can be modulated by the magnetic field and the carrier density in graphene.The second study focuses on the multi-terminal S-G-S junction with a loop which hosts Andreev bound states (ABS) in higher dimensions. Under specific voltage configurations, we are able to capture the elusive quartet-- a state composed of four entangled electrons that is responsible for nonlocal supercurrents. With the Josephson junction biased, the system becomes periodically driven and is analyzed in the framework of Floquet theory. The associated dynamical energy spectrum can be modified with gate control and probed via a phase difference achieved by flux threaded through the device loop. Altogether, we have opened up new possibilities for the manipulation of Andreev bound states, creating a playground potentially for topological states.

English

ISBN: 9798597059822Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Superconductivity

Superconducting Proximity Effect in Graphene /
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520 $a Graphene is a popular candidate when it comes to the study of the superconductivity proximity effect. However, experiments have mainly been focusing on the transport behavior in two-terminal Josephson junctions. This dissertation presents unconventional transport experiments which study aspects of the proximity effect that were previously unexplored. The first experiment investigates systematically the graphene (G) - superconductor (S) hybrid system with a controllable interfacial barrier strength. We demonstrate how the Andreev process can be modulated by the magnetic field and the carrier density in graphene.The second study focuses on the multi-terminal S-G-S junction with a loop which hosts Andreev bound states (ABS) in higher dimensions. Under specific voltage configurations, we are able to capture the elusive quartet-- a state composed of four entangled electrons that is responsible for nonlocal supercurrents. With the Josephson junction biased, the system becomes periodically driven and is analyzed in the framework of Floquet theory. The associated dynamical energy spectrum can be modified with gate control and probed via a phase difference achieved by flux threaded through the device loop. Altogether, we have opened up new possibilities for the manipulation of Andreev bound states, creating a playground potentially for topological states.
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653 $a Floquet spectrum
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