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Special CAMP: Electrical, thermoelectric, and phase coherent transport in nano-devices based on graphene, MoS2, and topological insulators

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Morteza Kayyalha, Purdue University
When
20 July 2017 from 2:30 PM to 3:30 PM
Where
339 Davey Laboratory
Contact Name
Cui-Zu Chang
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Due to their wide range of properties, two-dimensional (2D) materials have gained significant attention over the past few years. Among 2D materials, graphene and transition metal dichalcogenides (TMDCs) are particularly important due to their unique physical properties, making them interesting for application in optoelectronics and flexible electronics. On the other hand, three-dimensional (3D) topological insulators (TI) are a novel class of 2D materials and are characterized by the existence of an insulating bulk and non-trivial spin-helical Dirac fermion-like conducting surface states. Once coupled to the conventional s-wave superconductors, the surface states of TI’s offer a promising platform to realize various novel phenomena, such as topological superconductivity and Majorana bound states. In this talk, I first focus on the low-frequency noise performance of graphene devices, where we observed noise reduction once h-BN was used as the substrate. Then, I will discuss our experimental studies on MoS2 and its electrical and thermoelectric properties, where we revealed that reducing the dimensionality helps improve the thermoelectric power factor. In the last part of my talk, I will share our recent experiments on high-quality “intrinsic” topological insulators that will allow us to explore various characteristic properties of their topological surface states, such as half-integer Aharonov-Bohm effects and topological superconductivity.

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