5,084 research outputs found
Emergence of Gapped Bulk and Metallic Side Walls in the Zeroth Landau level in Dirac and Weyl semimetals
Recent transport experiments have revealed the activation of longitudinal
magnetoresistance of Weyl semimetals in the quantum limit, suggesting the
breakdown of chiral anomaly in a strong magnetic field. Here we provide a
general mechanism for gapping the zeroth chiral Landau levels applicable for
both Dirac and Weyl semimetals. Our result shows that the zeroth Landau levels
anticross when the magnetic axis is perpendicular to the Dirac/Weyl node
separation and when the inverse magnetic length is comparable to the
node separation scale . The induced bulk gap increases rapidly beyond
a threshold field in Weyl semimetals, but has no threshold and is non-monotonic
in Dirac systems due to the crossover between and
regions. We also find that the Dirac and possibly Weyl
systems host counterpropagating edge states between the zeroth Landau levels,
leading to a state with metallic side walls and zero Hall conductance.Comment: 8 pages, 4 figure
The Role of Auctions in Allocating Public Resources
This paper provides an economic framework within which to consider the effectiveness and limitations of auction markets. The paper looks at the use of auctions as a policy instrument and the effects of auction design on consumer interests, the efficient allocation of resources, and industry competitiveness.Australia; Research; Ascending-bid auction; Auctions; Bidders; Conservation funds; Descending-bid auction; Dutch auction; English auction; Environmental Management; First-price sealed-bid auction; Infrastructure; Markets; Oral auction; Outcry auction; Pollutant emission permits; Power supply contracts; Public resources; Radio- spectrum; Second-price sealed-bid auction Spectrum licences; Vickrey auction; Water rights;
The Perceptions of Macao Undergraduates Regarding Help Websites for Problem Gambling
This study conducted a web-surfing exercise and a questionnaire survey among a group of Macao undergraduate students regarding the websites that offered help with problem gambling. The results of this study found that most help websites in Macao and Hong Kong provided basic information-sharing service. The students indicated that they would choose their preferred help organization based on factors such as trust, familiarity, and the characteristics of the websites. They also gave comments/suggestions related to the publicity, design, contents, and focus of the websites. This study discussed the results and their implications for future research and practice
Graphomotoric coding in recognizing Chinese Characters
Also available in print.A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), University of Hong Kong, April, 30 1992.Thesis (B.Sc)--University of Hong Kong, 1992published_or_final_versionSpeech and Hearing SciencesBachelorBachelor of Science in Speech and Hearing Science
An Analysis of Gambling Expenditure Across Countries
This study hypothesized that gambling expenditure across countries was positively related to income and negatively related to uncertainty avoidance. Statistical analyses using secondary data were conducted to test the hypotheses. The results of a multivariate linear regression using income and uncertainty avoidance as the independent variables and gambling expenditure as the dependent variable showed that the two independent variables were significantly related to gambling expenditure. The two independent variables explained 56 percent of the variance in the dependent variable. An exponential model with only income as the independent variable, however, accounted for 72 percent of the variance in gambling expenditure. The results showed that income alone accounted for a substantial amount of variance in gambling expenditure. The study discussed the implications of the results
When chiral photons meet chiral fermions - Photoinduced anomalous Hall effects in Weyl semimetals
The Weyl semimetal is characterized by three-dimensional linear band touching
points called Weyl nodes. These nodes come in pairs with opposite chiralities.
We show that the coupling of circularly polarized photons with these chiral
electrons generates a Hall conductivity without any applied magnetic field in
the plane orthogonal to the light propagation. This phenomenon comes about
because with all three Pauli matrices exhausted to form the three-dimensional
linear dispersion, the Weyl nodes cannot be gapped. Rather, the net influence
of chiral photons is to shift the positions of the Weyl nodes. Interestingly,
the momentum shift is tightly correlated with the chirality of the node to
produce a net anomalous Hall signal. Application of our proposal to the
recently discovered TaAs family of Weyl semimetals leads to an
order-of-magnitude estimate of the photoinduced Hall conductivity which is
within the experimentally accessible range.Comment: 9 pages, 4 figure
- …