We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing a multimode tunneling junction. The system is realized with a Bose-Einstein condensate loaded in a one-dimensional optical lattice with high site occupancy. We induce an initial difference in chemical potential at one site by local atom removal. The ensuing transport dynamics are governed by the interplay between the tunneling coupling, the interaction energy, and intrinsic collisions, which turn the coherent coupling into a hopping process. The resulting current-voltage characteristics exhibit NDC, for which we identify atom number-dependent tunneling as a new microscopic mechanism. Our study opens new ways for the future implementation and control of complex neutral atom quantum circuits.

Negative differential conductivity in an interacting quantum gas / Labouvie, R.; Santra, B; Heun, S.; Wimberger, Sandro; Ott, H.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 115:5(2015), p. 050601. [10.1103/PhysRevLett.115.050601]

Negative differential conductivity in an interacting quantum gas

WIMBERGER, Sandro Marcel;
2015

Abstract

We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing a multimode tunneling junction. The system is realized with a Bose-Einstein condensate loaded in a one-dimensional optical lattice with high site occupancy. We induce an initial difference in chemical potential at one site by local atom removal. The ensuing transport dynamics are governed by the interplay between the tunneling coupling, the interaction energy, and intrinsic collisions, which turn the coherent coupling into a hopping process. The resulting current-voltage characteristics exhibit NDC, for which we identify atom number-dependent tunneling as a new microscopic mechanism. Our study opens new ways for the future implementation and control of complex neutral atom quantum circuits.
Negative differential conductivity in an interacting quantum gas / Labouvie, R.; Santra, B; Heun, S.; Wimberger, Sandro; Ott, H.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 115:5(2015), p. 050601. [10.1103/PhysRevLett.115.050601]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2796873
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