33 research outputs found
Inelastic Coulomb scattering rates due to acoustic and optical plasmon modes in coupled quantum wires
We report a theoretical study on the inelastic Coulomb scattering rate of an
injected electron in two coupled quantum wires in quasi-one-dimensional doped
semiconductors. Two peaks appear in the scattering spectrum due to the optical
and the acoustic plasmon scattering in the system. We find that the scattering
rate due to the optical plasmon mode is similar to that in a single wire but
the acoustic plasmon scattering depends crucially on its dispersion relation at
small . Furthermore, the effects of tunneling between the two wires are
studied on the inelastic Coulomb scattering rate. We show that a weak tunneling
can strongly affect the acoustic plasmon scattering.Comment: 6 Postscript figure
Excess resistivity in graphene superlattices caused by umklapp electron–electron scattering
In electronic transport, umklapp processes play a fundamental role as the only intrinsic mechanism that allows electrons to transfer momentum to the crystal lattice and, therefore, provide a finite electrical resistance in pure metals1,2. However, umklapp scattering is difficult to demonstrate in experiment, as it is easily obscured by other dissipation mechanisms1–6. Here we show that electron–electron umklapp scattering dominates the transport properties of graphene-on-boron-nitride superlattices over a wide range of temperature and carrier density. The umklapp processes cause giant excess resistivity that rapidly increases with increasing superlattice period and are responsible for deterioration of the room-temperature mobility by more than an order of magnitude as compared to standard, non-superlattice graphene devices. The umklapp scattering exhibits a quadratic temperature dependence accompanied by a pronounced electron–hole asymmetry with the effect being much stronger for holes than electrons. In addition to being of fundamental interest, our results have direct implications for design of possible electronic devices based on heterostructures featuring superlattices. © 2018, The Author(s), under exclusive licence to Springer Nature Limited
Extending a Tag-based Collaborative Recommender with Co-occurring Information Interests
Collaborative Filtering is largely applied to personalize item recommendation
but its performance is affected by the sparsity of rating data. In order to
address this issue, recent systems have been developed to improve
recommendation by extracting latent factors from the rating matrices, or by
exploiting trust relations established among users in social networks. In this
work, we are interested in evaluating whether other sources of preference
information than ratings and social ties can be used to improve recommendation
performance. Specifically, we aim at testing whether the integration of
frequently co-occurring interests in information search logs can improve
recommendation performance in User-to-User Collaborative Filtering (U2UCF). For
this purpose, we propose the Extended Category-based Collaborative Filtering
(ECCF) recommender, which enriches category-based user profiles derived from
the analysis of rating behavior with data categories that are frequently
searched together by people in search sessions. We test our model using a big
rating dataset and a log of a largely used search engine to extract the
co-occurrence of interests. The experiments show that ECCF outperforms U2UCF
and category-based collaborative recommendation in accuracy, MRR, diversity of
recommendations and user coverage. Moreover, it outperforms the SVD++ Matrix
Factorization algorithm in accuracy and diversity of recommendation lists