4,977 research outputs found
Plasmon geometric phase and plasmon Hall shift
The collective plasmonic modes of a metal comprise a pattern of charge
density and tightly-bound electric fields that oscillate in lock-step to yield
enhanced light-matter interaction. Here we show that metals with non-zero Hall
conductivity host plasmons with a fine internal structure: they are
characterized by a current density configuration that sharply departs from that
of ordinary zero Hall conductivity metals. This non-trivial internal structure
dramatically enriches the dynamics of plasmon propagation, enabling plasmon
wavepackets to acquire geometric phases as they scatter. Strikingly, at
boundaries these phases accumulate allowing plasmon waves that reflect off to
experience a non-reciprocal parallel shift along the boundary displacing the
incident and reflected plasmon trajectories. This plasmon Hall shift, tunable
by Hall conductivity as well as plasmon wavelength, displays the chirality of
the plasmon's current distribution and can be probed by near-field photonics
techniques. Anomalous plasmon dynamics provide a real-space window into the
inner structure of plasmon bands, as well as new means for directing plasmonic
beams
Large optical conductivity of Dirac semimetal Fermi arc surfaces states
Fermi arc surface states, a hallmark of topological Dirac semimetals, can
host carriers that exhibit unusual dynamics distinct from that of their parent
bulk. Here we find that Fermi arc carriers in intrinsic Dirac semimetals
possess a strong and anisotropic light matter interaction. This is
characterized by a large Fermi arc optical conductivity when light is polarized
transverse to the Fermi arc; when light is polarized along the Fermi arc, Fermi
arc optical conductivity is significantly muted. The large surface spectral
weight is locked to the wide separation between Dirac nodes and persists as a
large Drude weight of Fermi arc carriers when the system is doped. As a result,
large and anisotropic Fermi arc conductivity provides a novel means of
optically interrogating the topological surfaces states of Dirac semimetals.Comment: 8 pages, 3 figure
The influence of Chinese cultural values on consumer perceptions and behavioral intention towards an apparel mass customization website
Mass customization may deliver superior value to consumers compared to mass production because it provides personalized products with prices close to mass produced products. This assertion was made under the conditions and assumptions in Western societies where individual needs, rights, and interests are greatly valued. It is not known whether mass customization will deliver similar value to consumers in other societies, where different value systems exist. The purpose of the present study was to examine Chinese consumers\u27 responses toward mass customization and the influence of Chinese cultural values on these responses.;This study focused on web-based apparel mass customization and investigated (a) the effects of product price and customization level on consumers\u27 perceived value and (b) the effects of perceived value on consumers\u27 behavioral intention. Additionally, this research examined the moderating roles of Chinese cultural values on the relationships between the marketing attributes (price and customization level) and perceived value and between perceived value and behavioral intention.;The study used a between-subject experimental design involving manipulations of price and customization level. Four different treatments of a t-shirt website, resulting from the combination of two price levels and two customization levels, were used as the stimuli. A total of 344 participants from China participated in the study. Each respondent browsed one of the four randomly assigned treatments and completed an online questionnaire. Structural equation models were used to test the hypotheses.;Results showed that higher price significantly reduced Chinese consumers\u27 perception of economic value and efficiency, as hypothesized. Mass customization significantly enhanced consumers\u27 perceptions of product quality, enjoyment, and escapism, as hypothesized. However, respondents did not perceive enhanced economic value from the mass customization treatments. As hypothesized, perceived value explained behavioral intention. The study also found that two Chinese cultural values, relational orientation and man-nature orientation, significantly moderated the relationships between marketing attributes and perceived value and between perceive value and behavioral intention. These findings provide information needed for decision-making about marketing strategies for companies that would like to implement mass customization in China
How the X(5568) challenges our understanding of QCD
We discuss the X(5568) particle recently announced by the D0 Collaboration.
Several types of models were proposed to explain this structure in the
literature. As pointed out by Burns and Swanson (arXiv:1603.04366), none of
them provides a satisfactory description of the observation. We provide
additional arguments using general properties of QCD, and conclude that the
observation of the X(5568), if confirmed, poses serious challenges to our
understanding of nonperturbative QCD.Comment: 5 pages. Typos removed, a wrong statement corrected, conclusions
unchanged; the LHCb preliminary result mentioned at the en
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