Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Transport: Nanomechanics
TT 98.6: Hauptvortrag
Donnerstag, 3. April 2014, 16:30–17:00, BEY 81
Real-Space Tailoring of the Electron-Phonon Coupling in Ultra-Clean Nanotube Mechanical Resonators — •Shahal Ilani1, Avishai Benyamini1, Assaf Hamo1, Silvia Viola Kusminskiy2, and Felix von Oppen2 — 1Dept. of Cond. Matt. Phys., Weizmann Institute — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin
The coupling between electrons and phonons is at the heart of many fundamental phenomena in physics. In nature, this coupling is generally predetermined for both, molecules and solids. Although tremendous advances have been made in controlling electrons and phonons in engineered nanosystems, to date the control over the coupling between these degrees of freedom is still widely lacking. Here we demonstrate the ability to fully tailor electron-phonon interactions in a new class of suspended carbon nanotube devices, in which we can form highly-tunable single and double quantum dots at arbitrary locations along a nanotube mechanical resonator. We find that electron-phonon coupling can be turned on and off by controlling the position of a quantum dot along the resonator. Using more elaborate double quantum dots we structure the interactions in real space to couple specific electronic and phononic modes. Exploiting this tailored coupling we measure the parity of phonons in real space and directly image their mode shapes. Interestingly, we demonstrate tailored coupling of phonons to internal electrons in an isolated system, decoupled from the random environment of the electronic leads, a crucial step towards fully-engineered quantum coherent electron-phonon systems.