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Infrared Magneto-Spectroscopy of Cor...

Kapoor, Yashika,

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Infrared Magneto-Spectroscopy of Correlated Electron Systems in Graphene /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Infrared Magneto-Spectroscopy of Correlated Electron Systems in Graphene // Yashika Kapoor.
作者:	Kapoor, Yashika,
面頁冊數:	1 electronic resource (185 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
標題:	Physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31295156
ISBN:	9798382580852

Infrared Magneto-Spectroscopy of Correlated Electron Systems in Graphene /
Kapoor, Yashika,

Infrared Magneto-Spectroscopy of Correlated Electron Systems in Graphene /Yashika Kapoor. - 1 electronic resource (185 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

Van der Waals (vdW) heterostructures represent a novel class of artificial materials created by layering atomically thin planar crystals and offer a promising platform for band structure engineering. Here, we focus on a vdW heterostructure of monolayer graphene (G) coupled to a hexagonal boron nitride (h-BN). We utilize cyclotron resonance (CR) spectroscopy as a primary investigative tool for probing the interacting Dirac fermions in graphene. This work presents a system capable of conducting broadband far- to mid-infrared CR spectroscopy in high magnetic fields and ultra-low temperatures. Our study investigates the influence of the h-BN substrate on the properties of graphene in two key aspects. First, the atomic-scale modulations break the local symmetry between the graphene sublattices, influenced by the potential difference between boron and nitrogen atoms in h-BN. We perform CR measurements on high-quality graphene devices, presenting the first observation of the complete lifting of the four-fold degeneracy of Landau levels (LLs) due to broken spin and valley symmetries. Secondly, we explore the effect of near-perfect alignment between G/h-BN that causes the superlattice potential to match the magnetic length scale in graphene, yielding a self-similar energy spectrum. We spectroscopically investigate the fractal levels by measuring optical transitions across the reconstructed LLs in G/h-BN moire superlattice.

English

ISBN: 9798382580852Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Bolometer

Infrared Magneto-Spectroscopy of Correlated Electron Systems in Graphene /
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520 $a Van der Waals (vdW) heterostructures represent a novel class of artificial materials created by layering atomically thin planar crystals and offer a promising platform for band structure engineering. Here, we focus on a vdW heterostructure of monolayer graphene (G) coupled to a hexagonal boron nitride (h-BN). We utilize cyclotron resonance (CR) spectroscopy as a primary investigative tool for probing the interacting Dirac fermions in graphene. This work presents a system capable of conducting broadband far- to mid-infrared CR spectroscopy in high magnetic fields and ultra-low temperatures. Our study investigates the influence of the h-BN substrate on the properties of graphene in two key aspects. First, the atomic-scale modulations break the local symmetry between the graphene sublattices, influenced by the potential difference between boron and nitrogen atoms in h-BN. We perform CR measurements on high-quality graphene devices, presenting the first observation of the complete lifting of the four-fold degeneracy of Landau levels (LLs) due to broken spin and valley symmetries. Secondly, we explore the effect of near-perfect alignment between G/h-BN that causes the superlattice potential to match the magnetic length scale in graphene, yielding a self-similar energy spectrum. We spectroscopically investigate the fractal levels by measuring optical transitions across the reconstructed LLs in G/h-BN moire superlattice.
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653 $a Cyclotron resonance
653 $a Dilution fridge
653 $a Infrared spectroscopy
653 $a Graphene
653 $a Landau levels
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690 $a 0611
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