本文へジャンプ

Pioneering innovative energy and environmental
devices with Atomic-scale Nanotechnology

水田研究室 MIZUTA Laboratory
講師:ムルガナタンマノハラン(Muruganathan Manoharan)

E-mail:manojaist.ac.jp
[研究分野]
Atomic scale devices, Quantum and Hybrid Electronics
[キーワード]
Graphene, NanoElectroMechanical Systems(NEMS), Single Molecule sensor, 2D van der Waals(vdW) Heterostructure Quantum devices, Atomistic simulations

研究を始めるのに必要な知識・能力

In Mizuta-Manoharan laboratory, we are conducting interdisciplinary research by integrating physics, electrical and electronics engineering, mechanical engineering, chemistry and Biology research fields. Fundamental knowledge in these fields is important for our research works.

この研究で身につく能力

Mizuta-Manoharan laboratory utilizes atomic layer materials like graphene, h-BN, MoS2, etc and ultrafine fabrication technology with 1 nanometer precision to develop ultra-sensitive environmental sensor Devices, ultra-low power consumption NEMS switches, quantum information processing devices, and so on. Based on these researches, students will obtain first-hand experience in (1) Electron Beam lithography and cutting edge Helium ion beam patterning technologies and nano-device fabrication processes, (2) Environmentally controlled 5 K to 500 K temperature range DC and RF probe stations, dilution refrigerator, Electrical characteristic measurements, (3) Design and analysis techniques ranging from fi rst principles calculation to device and circuit simulations.

【就職先企業・職種】 Information and Communications Technology Companies and Manufacturing Industries.

研究内容

In Mizuta-Manoharan laboratory, we carry out research using graphene and other 2D atomic layer materials and ultra-fine fabrication technology with atomic scale precision for Extremely sensitive environmental sensor, Ultra-low power consumption NEMS switch, Quantum information processing device, Thermal phonon engineering devices, etc. We are aiming to contribute to energy and environmental problems.

Specifically, we focus on following four research topics:

1.Graphene Nanoelectromechanical (GNEM) sensors:


Fig.1 (a) Schematic diagram of pulling down a suspended graphene with electrostatic force onto the bottom electrode. (b) AFM image of the suspended graphene beam.

Fig.2 Monolayer GNEMS Switch SEM image

Fig.3 (a) CO2 molecule adsorbed on to graphene beam (b) Charge distribution across the molecule (c) Molecular dynamics simulation

By using highly sensitive GNEM devices, we are developing Extremely sensitive environmental sensors enabling detection of even single molecule. Using GNEM device structure, we are developing energy harvesting architecture for environmental sensor self-powering capability.

2.Graphene Nano Electro Mechanical Switches

 We are developing novel NEMS devices that are impossible with conventional semiconductor materials. Graphene and other 2D materials NEMS switches research work is carried out for ultra-low power integrated system operating at low voltage.

3.Quantum information device and Graphene tunnel field effect transistor

We study the quantum information devices using graphene and other 2D materials to realize long spin decoherence time. Tunnel field eff ect transistors (TFET) are electrical switching devices based on novel physics, which can overcome the theoretical subthreshold slope limitation of conventional silicon MOSFETs. As silicon TFETs suff ers from low ON current, we study the operation mechanism and performance limit of graphene TFETs both experimentally and multi-scale simulations (first-principles and device level).

4.Atomistic and Multiscale Phonon simulations

We aim to develop a graphene phononic device that can control thermal phonons (phonon in the THz regime) by forming periodic nanopore structure in graphene. We also study single dopants in Silicon and vacancy-centers in diamond by first-principles simulations.

 

主な研究業績

  1. A.M. Hammam, M.E. Schmidt, M. Muruganathan, S. Suzuki, and H. Mizuta, ‘Sub-10 nm graphene nano-ribbon tunnel field-eff ect transistor’ Carbon, DOI: 10.1016/j.carbon.2017.09.091, (2017)
  2. M. Muruganathan, J. Sun, T. Imanura and H. Mizuta, ‘Electrically- tunable van der Waals interaction in graphene-molecule complex’, Nano Letters 15,8176-8180 (2015)
  3. J. Sun, M. Muruganathan, and H. Mizuta, ‘Room temperature detection of individual molecular physisorption using suspended bilayer graphene’, Science Advances 2, 4, e1501518 (2016)

使用装置

Electron beam lithography - Nano-device fabrication equipment Gas Field ionization gas ion source (GFIS) microfabrication equipment
Environmentally controlled 5 K and RF prober
Atomic resolution scanning transmission electron microscope
First-principles quantum transport simulator

研究室の指導方針

We explore a variety of emerging nanotechnologies for ‘More-than-Moore’ and ‘Beyond CMOS’ era. We warmly welcome young scientists seeking an active international research environment.

[研究室HP] URL:http://www.jaist.ac.jp/ms/labs/mizuta-lab/

ページの先頭へもどる