[Topology] Year Started : 2020

Affiliation and job title should automatically appear from the information that a researcher registered with researchmap.
Data may be outdated or undocumented.
When there is not a connection via the internet, data are not displayed.

Qianchun Weng

Elucidate electron dynamics in topological materials by nanoscale noise imaging

Researcher
Outline

Various scattering and dissipation channels exist in realistic topological materials/devices. However, it is difficult to directly clarify those fundamental scattering and dissipation dynamics due to a lack of efficient experimental method. In this project, a conceptually new microscope called scanning noise microscope (SNoiM) is developed for directly visualizing nanoscale charge transport and energy dissipations and elucidate the detailed mechanisms of local scattering and dissipations at the surface of topological materials.

Hiroshi Kamata

Spin and charge dynamics in topological edge states

Researcher
Outline

This project aims to investigate spin and charge dynamics in helical edge states of a two-dimensional topological insulator which is artificially created with semiconductor heterostructures. These dynamics and artificial topological phases will be electrically observed and controlled by means of radio frequency measurement techniques, which can be applied to various topological materials. The goal of this project is to pave the way for realizing topological fault-tolerant quantum computing.

Kyoko Kitamura

Development of Distorted-Photonic Crystal Science and Applying to Topological Beam Lasers

Researcher
Outline

In this project, I will develop “distorted-photonic crystal”, which possesses lattice distortion in photonic crystals, to control optical orbit in real-space. Then, I will apply this unique characteristic of distorted-photonic crystal to photonic-crystal lasers, which lead the realization of spatial phase control of the output beams.

Tetsuro Kusamoto

Development of functions on kagome-honeycomb hybrid lattices based on radicals with three hold symmetry

Researcher
Outline

I challenge to develop a variety of highly crystalline coordination polymers with kagome, honeycomb, and kagome-honeycomb hybrid lattices by means of coordination reaction between metal ions and stable organic radicals with three-hold symmetrical structures. The goal of this study is to establish novel electricity-magnetism-photonics-correlated functions resulted from interplay between structural topology, band filling unique to radical-based molecular materials, and weak but nonnegligible electronic interactions between the components.

Yijin Zhang

Bulk photovoltaic effect in polar 2D materials and their van der Waals heterostructures

Researcher
Outline

This project studies the bulk photovoltaic effect in two dimensional materials with polar structures and their van der Waals heterostructures. The bulk photovoltaic effect converts solar energy into electrical energy owing to the intrinsic Berry connection of materials. This effect is anticipated to be applied to future devices for solar energy harvesting. I will investigate the correlation between the emergence of bulk photovoltaic effect, fundamental physical properties, structure and symmetry of crystals. Through this project I aim to provide guidelines for future device applications.

Yosuke Nakata

Spacetime control of terahertz topological states induced by light

Researcher
Outline

This project studies the bulk photovoltaic effect in two dimensional materials with polar structures and their van der Waals heterostructures. The bulk photovoltaic effect converts solar energy into electrical energy owing to the intrinsic Berry connection of materials. This effect is anticipated to be applied to future devices for solar energy harvesting. I will investigate the correlation between the emergence of bulk photovoltaic effect, fundamental physical properties, structure and symmetry of crystals. Through this project I aim to provide guidelines for future device applications.

Takuya Nomoto

First-principles search for topological magnets

Researcher
Outline

Magnetic skyrmions and noncolinear magnets are promising candidates for future applications in spintronics devices. In this project, I will focus on the functionality of such topological magnets. In practice, I will investigate their transport properties and control techniques by developing non-empirical methods based on the ab-initio electronic structure calculation. The goal of this project is to make a database of functional topological magnets and predict a promising material for the device application.

Satoru Hayami

Theoretical study of novel topological magnets based on spiral structures

Researcher
Outline

Topological magnets have recently been found in a variety of materials. This research aims at clarifying the microscopic and macroscopic conditions, such as the stabilization mechanism and crystal symmetry, to realize topological magnets on the basis of the internal degrees of freedom in the spiral magnetic structures. Moreover, I will develop a theoretical design principle of topological magnets by constructing a database to list the necessary model parameters under each crystallographic point group.

Daichi Hirobe

Geometric properties of chiral-induced spin selectivity and molecular spin/light functionalities

Researcher
Outline

Chiral-induced spin selectivity has been investigated intensively in the field of chemistry, the essence of which remains to be clarified. This project is based on the correspondence of this selectivity and geometric charge rectification. Using this, I will explore molecular spin/light functionalities and their geometric properties. This approach will be effective in investigating topological aspects of chiral-induced spin selectivity.

Ryusuke Matsunaga

Development of functionalities in topological semimetals toward terahertz high-speed electronics and spintronics

Researcher
Outline

This project focuses on opitical responses in topological semimetals associated with linear energy dispersion and Berry curvature. It is aimed at realizing efficient frequency conversion, stimulated emission, and control of magnetism in terahertz frequency at room temperature, which will lead to the development of functionalities in topological semimetals for high-speed electronics and spintronics.

Kei Yamamoto

Non-reciprocal surface waves: Anomalies in materials science

Researcher
Outline

Many of well-known wave phenomena, including acoustic waves and spin waves, possess robust surface localized modes that exhibit “non-reciprocity”; unidirectional propagation along the surface. This project attempts to reveal a possible link between the non-reciprocity of surface waves appearing in materials science and a theoretical concept in high energy physics: Anomalies. Anomalies characterize topological features of low-energy effective field theories, underlying the existence of surface localized gapless excitations that cannot be realized in a bulk system. By extending the principle to condensed matter physics, the project aims at predicting novel non-reciprocal surface waves that could be applied for rectification of heat and spin currents.

Quick Access

Program

  • CREST
  • PRESTO
  • ACT-I
  • ERATO
  • ACT-X
  • ACCEL
  • ALCA
  • RISTEX
  • AIP Network Lab
  • JST ProjectDB
  • Global Activities
  • Diversity
  • SDGs
  • OSpolicy
  • Yuugu
  • Questions