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Electron backscattering in a cavity: Ballistic and coherent effects

Lookup NU author(s): Dr Aleksey KozikovORCiD


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Numerous experimental and theoretical studies have focused on low-dimensional systems locally perturbed by the biased tip of a scanning force microscope. In all cases either open or closed weakly gate-tunable nanostructures have been investigated, such as quantum point contacts, open or closed quantum dots, etc. We study the behavior of the conductance of a quantum point contact with a gradually forming adjacent cavity in series under the influence of a scanning gate. Here, an initially open quantum point contact system gradually turns into a closed cavity system. We observe branches and interference fringes known from quantum point contacts coexisting with irregular conductance fluctuations. Unlike the branches, the fluctuations cover the entire area of the cavity. In contrast to previous studies, we observe and investigate branches under the influence of the confining stadium potential, which is gradually built up. We find that the branches exist only in the area surrounded by cavity top gates. As the stadium shrinks, regular fringes originate from tip-induced constrictions leading to quantized conduction. In addition, we observe arclike areas reminiscent of classical electron trajectories in a chaotic cavity. We also argue that electrons emanating from the quantum point contact spread out like a fan leaving branchlike regions of enhanced backscattering.

Publication metadata

Author(s): Kozikov AA, Weinmann D, Rössler C, Ihn T, Ensslin K, Reichl C, Wegscheider W

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2016

Volume: 94

Issue: 19

Print publication date: 15/11/2016

Online publication date: 17/11/2016

Acceptance date: 01/11/2016

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society


DOI: 10.1103/PhysRevB.94.195428


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