Danial Majidi- ESR 1, March 2018 - February 2021
Institut Néel, CNRS and Université Grenoble Alpes, France
Master thesis: "Simulation and Analysis of Caloritronics Effect on Germanene", Qazvin Azad University, Qazvin, Iran.
We investigated the relation between thermoelectric phenomena and spintronic in novel 2D material, Particularly in Germanene Nanoribbons.My inquiry focuses on spin transport through the device in different temperature bias instead of gate voltage, electrical bias or electrical field. We illustrate how the temperature difference can generate spin dependent current and waste or loss energy can be decreased or utilized in low-power-consumption nano devices. Also explore the effect of gate voltage and chemical potential on proposed device, we found that by tuning the back gate voltage or chemical potential the spin current can be completely modulated and polarized.
Personal Training Committee
Main Supervisor: Hervé Courtois, CNRS
Co-supervisor: Jukka Pekola, AALTO
Mentor: Guido Piaszenski, RAITH
At RAITH (February/March 2019) to perform sample preparation with EBL and EBID for producing SNS SETs,
At AALTO (January/March 2020) to get trained on metrology-grade current measurement,
At UKON (February 2021) for calculating the thermopower in Au atomic contacts and comparing it with the existing experimental data.
Energy transport and relaxation dynamics in a single quantum dot device
Objectives: We will study quantum dot-based single electron transistors formed by electromigration in an all-metal circuitry. The device will consist of a finite size normal metallic region N connected on one side to a superconducting lead (S) and on the other to a quantum dot junction. When properly tuned, the quantum dot selectively can let hot charge carriers leave N, which are replaced by entropy-free Andreev pairs from S. Additional superconducting tunnel junctions to N can provide an independent temperature measurement. We will test and characterize electronic cooling in such devices. Here, the quantum dot will display extremely well defined spectral features, the metallic region to be cooled has a large and continuous density of states, and finally charging effects are vanishing in N. These facts will allow strong improvements over the state-of-the-art of quantum dot-based refrigerators