Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS


QUANT-DES-CNT Berichtzusammenfassung

Project ID: 258753
Gefördert unter: FP7-IDEAS-ERC
Land: Israel

Final Report Summary - QUANT-DES-CNT (Quantum Design in Carbon Nanotubes)

Recent years have seen the development of several experimental systems capable of tuning local parameters of quantum Hamiltonians. Examples include ultracold atoms, trapped ions, superconducting circuits, and photonic crystals. By design, these systems possess negligible disorder, granting them a high level of tunability. Conversely, electrons in conventional condensed matter systems exist inside an imperfect host material, subjecting them to uncontrollable, random disorder, which ¬often destroys delicate correlated phases and precludes local tunability. The realization of a condensed matter system that is disorder-free and locally-tunable thus remains an outstanding challenge. In this project we developed a new technique for deterministic creation of locally-tunable, ultra-low-disorder electron systems in carbon nanotubes suspended over circuits of unprecedented complexity. This technique allowed us to create the most complex, yet electronically clean, quantum devices from carbon nanotubes made to date. We have used this system to address central fundamental questions on the physics of electrons and phonons in low dimensions. We have demonstrated the ability to modify and measure the wavefunctions of electrons along the nanotube. We showed that when electrons have strong interactions they form the long-sought Wigner molecule quantum state. The ability to localize electrons to quantum dots at arbitrary locations along the nanotube has allowed us to create an artificial electron-phonon coupling in this system whose magnitude, spatial dependence and dynamics can be tailored at will. Finally, using our pristine nanotube devices as ultra-sensitive scanning potential detectors we could uncover that the conducting two-dimensional electron system in the complex oxide interface between Strontium titanate and Lanthanum aluminate is living in an emergent striped potential landscape, having important consequences to its physics.

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