19 research outputs found
Electronic properties and phase transitions in low-dimensional semiconductors
We present the first review of the current state of the literature on
electronic properties and phase transitions in TlX and TlMX2 (M = Ga, In; X =
Se, S, Te) compounds. These chalcogenides belong to a family of the
low-dimensional semiconductors possessing chain or layered structure. They are
of significant interest because of their highly anisotropic properties, semi-
and photoconductivity, non-linear effects in their I-V characteristics
(including a region of negative differential resistance), switching and memory
effects, second harmonic optical generation, relaxor behavior and potential
applications for optoelectronic devices. We review the crystal structure of TlX
and TlMX2 compounds, their transport properties under ambient conditions,
experimental and theoretical studies of the electronic structure, transport
properties and semiconductor-metal phase transitions under high pressure, and
sequences of temperature-induced structural phase transitions with intermediate
incommensurate states. Electronic nature of the ferroelectric phase transitions
in the above-mentioned compounds, as well as relaxor behavior, nanodomains and
possible occurrence of quantum dots in doped and irradiated crystals is
discussed.Comment: 70 pages, 38 figure
Conducting interactive experiments online
Online labor markets provide new opportunities for behavioral research, but conducting economic experiments online raises important methodological challenges. This particularly holds for interactive designs. In this paper, we provide a methodological discussion of the similarities and differences between interactive experiments conducted in the laboratory and online. To this end, we conduct a repeated public goods experiment with and without punishment using samples from the laboratory and the online platform Amazon Mechanical Turk. We chose to replicate this experiment because it is long and logistically complex. It therefore provides a good case study for discussing the methodological and practical challenges of online interactive experimentation. We find that basic behavioral patterns of cooperation and punishment in the laboratory are replicable online. The most important challenge of online interactive experiments is participant dropout. We discuss measures for reducing dropout and show that, for our case study, dropouts are exogenous to the experiment. We conclude that data quality for interactive experiments via the Internet is adequate and reliable, making online interactive experimentation a potentially valuable complement to laboratory studies
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Who Are Leaners? How True Independents Differ from the Weakest Partisans and Why It Matters
Independents who lean toward a party constitute a plurality of Americans. Despite their reluctance to identify as partisans, scholars find that "leaners"look much like partisans with respect to their voting behavior, civic engagement, and policy preferences. Yet, existing literature does not consider the possibility that different factors lead Democrats and Republicans to opt for an independent label. We consider heterogeneity in what leads people to report that they are "leaners"and we identify important partisan differences. By introducing a novel survey measure administered on a large adult sample, we identify both the motivation for, and consequence of, identifying as a leaner. Our results reveal that modern-day Republican leaners are largely motivated by a dissatisfaction with their own party. They are ideologically more moderate and are subsequently less willing to support their party's candidate. Democratic leaners, on the other hand, appear satisfied with their party's ideology and candidates, but nevertheless value an independent label. Our work suggests that partisan identification is both expressive and politically contextual. Our study provides an important step in identifying distinct motivations and electoral consequences within this large and growing segment of Americans. © 2022 Walter de Gruyter GmbH, Berlin/Boston.12 month embargo; published online: 21 June 2022This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]