Collaborative Research Center 767
Controlled Nanosystems

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Research Program

The field of nanoscience has significantly matured during the last decade. Perspectives for applications based on nanostructures have emerged which rely crucially on a precise control of the interaction between nanosystems or the influence of external fields. Our SFB has contributed significantly to the progress in nanoscience by developing control mechanisms for individual nanosystems. We have shown that achieving control by structural, optical or electric means is a promising route to an advanced understanding of mechanical, electronic, and magnetic properties of nanosystems. Our research program is organized around these topics.

Project area A: Structural and mechanical properties

In the first area the investigations have focused on coherent mechanical excitations of membranes and beams controlled by electromagnetic fields. One main finding is the origin of mechanical damping in nanomembranes and the coherent control of a nanobeam. In future, this area will extend the research towards control of heat transport by temperature gradients.

A01 Optically control of phonons and their dissipation in nanostructures
A07 Dielectric control of high Q nanomechanical resonators
A08 Vibrational properties and phonon transport of nanobridges

Project area B: Optical and electronic properties

In this research area the main goal is to use the potential of optical control of nanosystems. An unprecedented level of control was achieved experimentally by two-color excitations of molecules and theoretically of spin-qubit candidates. Further major progress concerned stability of colloidal quantum dots, their control on ultrafast time scales and in magnetic fields as well as direct detection of the photonic vacuum. In future, this area will expand to an ultrafast control of the coupling between a tunnel current and photons.

B02 Ultrafast quantum control of single electrons and photons in mesoscopic systems
B03 Controlling fluorescence emission of single molecules by vibrational excitation
B06 Coherent optical spin and charge control in nanostructures
B08 Electron transport in nanostructures controlled by phase-locked single-cycle light pulses

Project area C: Electronic and magnetic transport properties

The third project area has elaborated on the control of electrons in single molecular junctions or quantum point contacts and the magnetization in nanostructures. As highlights we have shown how to control single spins in molecules, single electrons by voltage pulses, vibrational modes by current, and domain walls by thermal gradients.

C02 Controlling the electronic transport through molecular systems
C03 Time-dependent transport in correlated electron nanostructures
C04 Controlling the spin and electronic interaction in atomic and molecular contacts
C10 Control of magnetic nanostructures by spin currents and thermal excitation
C11 Control of magnetic domains and domain walls by thermal gradients
C13 Mechanical control of charge transport through nanostructures
C14 Local spectroscopy of multi-spin molecules: valency distributions and magnetic properties

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