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Twisted Bilayer Graphene Probed with...

Sunku, Sai Swaroop.

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Twisted Bilayer Graphene Probed with Nano-Optics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Twisted Bilayer Graphene Probed with Nano-Optics./
作者:	Sunku, Sai Swaroop.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	142 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
Contained By:	Dissertations Abstracts International82-10B.
標題:	Nanotechnology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28322509
ISBN:	9798708727534

Twisted Bilayer Graphene Probed with Nano-Optics.
Sunku, Sai Swaroop.

Twisted Bilayer Graphene Probed with Nano-Optics. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 142 p.

Source: Dissertations Abstracts International, Volume: 82-10, Section: B.

Thesis (Ph.D.)--Columbia University, 2021.

This item must not be sold to any third party vendors.

The discovery of strongly correlated electronic phases in twisted bilayer graphene has led to an enormous interest in twisted van der Waals (vdW) heterostructures. While twisting vdW layers provides a new control knob and never before seen functionalities, it also leads to large spatial variations in the electronic properties. Scanning probe experiments are therefore necessary to fully understand the properties of twisted vdW heterostructures.In this thesis, we studied twisted bilayer graphene (TBG) with two scanning probe techniques at two twist angle regimes. At small twist angles, our nano-infrared images resolved the spatial variations of the electronic structure occurring within a Moire unit cell and uncovered a quantum photonic crystal. Meanwhile, with nano-photocurrent experiments, we resolved DC Seebeck coefficient changes occurring in domain walls on nanometer length scales. At larger twist angles, we mapped the twist angle variations naturally occurring in our device with a combination of nano-photocurrent and nano-infrared imaging. Finally, we also investigated different materials for use as nano-optics compatible top gates in future experiments on TBG. Our results demonstrate the power of nano-optics techniques in uncovering the rich, spatially inhomogeneous physics of twisted vdW heterostructures.

ISBN: 9798708727534Subjects--Topical Terms:

526235
Nanotechnology.
Subjects--Index Terms:

Nano-optics

Twisted Bilayer Graphene Probed with Nano-Optics.
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520 $a The discovery of strongly correlated electronic phases in twisted bilayer graphene has led to an enormous interest in twisted van der Waals (vdW) heterostructures. While twisting vdW layers provides a new control knob and never before seen functionalities, it also leads to large spatial variations in the electronic properties. Scanning probe experiments are therefore necessary to fully understand the properties of twisted vdW heterostructures.In this thesis, we studied twisted bilayer graphene (TBG) with two scanning probe techniques at two twist angle regimes. At small twist angles, our nano-infrared images resolved the spatial variations of the electronic structure occurring within a Moire unit cell and uncovered a quantum photonic crystal. Meanwhile, with nano-photocurrent experiments, we resolved DC Seebeck coefficient changes occurring in domain walls on nanometer length scales. At larger twist angles, we mapped the twist angle variations naturally occurring in our device with a combination of nano-photocurrent and nano-infrared imaging. Finally, we also investigated different materials for use as nano-optics compatible top gates in future experiments on TBG. Our results demonstrate the power of nano-optics techniques in uncovering the rich, spatially inhomogeneous physics of twisted vdW heterostructures.
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