Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Gases: Bosons III
Q 20.1: Vortrag
Dienstag, 24. März 2015, 11:00–11:15, P/H2
Negative Differential Conductivity in an Interacting Quantum Gas — •Bodhaditya Santra1, Ralf Labouvie1, Simon Heun1, Sandro Wimberger2, and Herwig Ott1 — 1Research Center OPTIMAS and Fachbereich Physik, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institut f ür Theoretische Physik, Universität Heidelberg, 69120 Heidelberg, Germany
Negative differential conductivity (NDC) is a widely exploited mechanism in many areas of research dealing with particle and energy transport. We experimentally realize such a many body quantum transport system based on ultracold atoms in a periodic potential. We prepare our system by loading Bose condensed 87Rb in a 1D optical lattice with high atom occupancy per lattice site. Subsequently, we remove all the atoms from a central lattice site. While the atoms from neighboring sites tunnel into the empty site, we observe NDC in the resulting current voltage characteristics and investigate the microscopic mechanism behind it.