Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"Van der Waals heterostructures"”.
-
Optoelectronics of graphene-based Van der Waals heterostructures
Research on van der Waals (vdW) materials (homo- or hetero-) is a rapidly emerging field in condensed matter physics. They are layered structures with strong chemical bonding within layers and relatively weak van der Waals force to combine layers together. This unique layer-bylayer nature makes it …
-
Thermodynamic and tunneling measurements of van der Waals heterostructures
… spectrum. Both techniques were applied to van der Waals materials, a class of crystals composed of layered atomic sheets with weak interplane bonding which permits the isolation of single and few-layer sheets that can be manually assembled into heterostructures. Capacitance measurements …
-
Interface-Governed Optical Properties of Van der Waals Heterostructures
Van der Waals (vdW) layered materials are an emerging class of materials that can be readily separated into atomically thin layers, exhibiting distinct physical properties compared to their bulk counterparts. Moreover, each of the layers can be vertically assembled into vdW heterostructures, …
-
Twist angle physics in graphene based van der Waals heterostructures
… experimental work on twisted bilayer graphene, a van der Waals heterostructure consisting of two graphene sheets stack on top of each other. In particular, the twist angle is a new degree of freedom in this system, and has an important effect in the determination of its transport properties. The …
-
NANOPATTERNING OF FREE-STANDING VAN DER WAALS HETEROSTRUCTURES USING CHARGED PARTICLES
… high spatial and depth resolution in stacked van der Waals heterostructures remains challenging. In this thesis, we demonstrate selective nanopatterning of free-standing hBN-encapsulated graphene and semiconducting TMDs using focused helium ion beams. By leveraging differences in electronic …
-
Large-scale density functional theory study of van-der-Waals heterostructures
… the goal of this thesis is to deepen the understanding of the comparatively unknown heterostructures composed of different stacked layers. First, we utilise linear-scaling density functional theory (LS-DFT) to simulate intricate interfaces between the most promising layered materials, such …
-
Electronic properties and device applications of rotationally controlled van der Waals heterostructures
Van der Waals heterostructure is a highly versatile platform to unveil two-dimensional (2D) electron physics and to explore new device functionalities. In this dissertation, we present comprehensive experimental studies of van der Waals heterostructures considering the rotational control between …
-
SPIN AND CHARGE TRANSPORT IN 2D MATERIALS AND VAN DER WAALS HETEROSTRUCTURES
… superconductivity in 2D materials and van der Waals heterostructures. Our approach is to realize topological superconductivity in Ising superconductors. A survey of different candidate materials systems for topological superconductivity is presented in this report. We will show that the …
-
Van der Waals Heterostructures and 2D Materials with Native Oxide for Emerging Electronic Applications
The rapid advancement of Artificial Intelligence (AI) and Machine Learning (ML) in various industries has created a significant energy demand. However, this demand poses a challenge as the world strives to shift towards sustainable energy sources. The current computational paradigms, reliant on …
-
The Hofstadter spectrum of monolayer and bilayer graphene van der Waals heterostructures with boron nitride
In this thesis, we consider the electronic properties of materials created by stacking two-dimensional graphene layers. The first material is a heterostructure created by placing a graphene layer on top of a layer of hexagonal boron nitride. The energy bands are determined as well as the energy …
-
Fabricating Van der Waals heterostructures with air sensitive materials : a study of flake Bi₂Sr₂CaCu₂08₊x.
Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, June 2018.
-
THERMAL AND THERMOELECTRIC PROPERTIES OF TWO-DIMENSIONAL HETEROSTRUCTURES
… interesting physics and potential applications. Van der Waals heterostructures with one 2D material stacked on another, are being established for devices with new functionalities and improved properties. The study of thermal properties is important for heat management of electronic devices while …
-
Nanoscale Characterisation of Heterointerfaces in 2D Materials
… years, bulk materials, such as silicon, have underpinned electronic devices[1]. Whilst remarkable improvements to performance have been achieved through miniaturisation, progress is slowing as we approach the physical limitations of bulk materials[1, 2]. As materials which naturally exist as 3D …
-
Probing electron-electron and electron-phonon interactions in twisted bilayer graphene
… techniques that allow for controlled stacking of van der Waals heterostructures [17, 54]. For example, it was recently discovered that when two pieces of atomically thin carbon (graphene) are twisted at 1.1° with respect to one another, they display a variety of effects, including superconducting …
-
Introducing spin-orbit interaction in graphene
… and gate tunability, make it central to modern nanoscience. However, the spin-orbit interaction (SOI) naturally present in graphene is extremely weak and has yet to be observed experimentally. This presents an obstacle for accessing novel phenomena in transport and optics, in particular …
-
Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
… hBN an ideal material for the exploration of Van der Waals heterostructures made layer by layer between hBN/graphene related materials with new physics and applications. This thesis work focuses on the development of high quality hexagonal boron nitride (hBN) by metal organic chemical vapor …
-
Probing valley and magnetic photoexcitations in 2D crystals and their heterostructures
… for investigating physics in two dimensions. Understanding the optical response of 2D layered materials and their heterostructures at the atomically thin limit is an important aspect of this field. Photoexcitations, such as excitons, critically impact future optoelectronic technologies, such as …
-
Magnetism in Two-Dimensional van der Waals Materials
Layered van der Waals crystals are a rich proving ground for exploring electronic behavior confined to two dimensions. Since the discovery of graphene in 2004, a large family of crystals has been isolated in the ultrathin limit, hosting a range of different properties, including semiconductors, …
-
Graphene-Based Nanodevices in the Superconducting and Strongly Correlated Regimes
… few-atoms-thick materials represents a major advance in condensed matter physics. Assembling these ultra-thin materials into van der Waals heterostructures, i.e., artificial meta-materials with atomically sharp interfaces, markedly increases the rich variety of physical properties accessible in …
-
Optics and Optoelectronics of Atomically Thin Magnets and Semiconductors
Since the discovery of graphene, layered van der Waals materials have become one of the most active subjects of study. The array of available atomically thin materials has expanded rapidly beyond graphene, encompassing a wide variety of physical properties ranging from insulators like hexagonal …
Page 1 of 2