Topological Electronics

The “Topological Electronics” program is a project within the framework of the Strategic Japanese-German Cooperation Program on “Nanotechnology contributing Electronics, Information and Communication” co-funded by the JST in Japan and the DFG in Germany. The program reunites the efforts of 8 research groups spread over 4 universities, 2 each in Japan and Germany. As the name suggest, the aim of the work is to explore the novel field of Topotronics.
More specifically, the project proposes Topotronics as a new paradigm of electronics which utilizes novel quantum degrees of freedom including the geometrical phase (Berry phase), the concept of the topological insulator, and non-local coherence or entanglement. The aim of this project is to build a concept for dissipationless electronics and provide technical breakthroughs for solid state quantum information technology, two very innovative and challenging aims to be met as we move towards future electronics and information technologies.
Topology in general simply means geometry dealing with position and phase, but here it is used to refer to electronics in which electrical control of geometrically protected quantum phenomena is the key element. In this proposal, we particularly focus on such representative quantum phenomena in low-dimensional electronic systems. These include: (A) Spin-orbit interaction, (B) Topological insulators, and (C) Non-local generation of entanglement (non-local entangler). A geometry-related quantum nature of the states and their interactions plays an essential role in all of these concepts. (A) is manifestation of combined relativistic and quantum mechanical effects on mobile electrons in solid and (B) is a new quantum state arising from topological features of the quantum phase. Both have until recently been ignored by the electronics industry, despite their fundamental potential with respect to dissipation free electronics. (C) is a concept which enables independent quantum operation of spatially separated entangled electron pairs, and its full control may well bring a real breakthrough in solid state quantum information technology.

First Meeting

Presentations and a detailed shedule can be found under First Meeting (Password required).

Second Meeting

Presentations and a detailed shedule can be found under Second Meeting (Password required).

Japanese Team

Seigo Tarucha (Leader)
Nanostructure science
Dept. of Applied Physics

Naoto Nagaosa
Theoretical Physics
Dept. of Applied Physics

Junsaku Nitta
Nano-materials Science
Dept. of Material Science

Lab. Nanoelectronics and Spintronics
Res. Inst. Elect. Commun.

German Team

Laurens W. Molenkamp (Leader)
EP3: Semiconductor Physics
Institute of Physics

Björn Trauzettel
Mesoscopic Physics
Institute for theoretical physics and astrophysics

Mesoscopic Physics

D. Weiss / S. Ganichev
Physics of micro and nanostructures / TERZ
Institute for experimental and applied physics

K. Richter
Complex quantum systems
Institute for theoretical physics