Spin Hall effect at interfaces between HgTe/CdTe quantum wells and metals

We study the spin-dependent transmission through interfaces between a HgTe/CdTe quantum well (QW) and a metal - both for the normal metal and the superconducting case. Interestingly, we discover a new type of spin Hall effect at these interfaces that happens to exist even in the absence of structure and bulk inversion asymmetry within each subsystem (i.e. the QW and the metal). Thus, this is a pure boundary spin Hall effect which can be directly related to the existence of exponentially localized edge states at the interface. We demonstrate how this effect can be measured and functionalized for an all-electric spin injection into normal metal leads.Comment: 7 pages, 6 figure

Spin-dependent thermoelectric transport in HgTe/CdTe quantum wells

We analyze thermally induced spin and charge transport in HgTe/CdTe quantum wells on the basis of the numerical non-equilibrium Green's function technique in the linear response regime. In the topologically non-trivial regime, we find a clear signature of the gap of the edge states due to their finite overlap from opposite sample boundaries -- both in the charge Seebeck and spin Nernst signal. We are able to fully understand the physical origin of the thermoelectric transport signatures of edge and bulk states based on simple analytical models. Interestingly, we derive that the spin Nernst signal is related to the spin Hall conductance by a Mott-like relation which is exact to all orders in the temperature difference between the warm and the cold reservoir.Comment: 11 pages, 13 figures, submitted to PR

Pestilence in Paradise: Leprosy Accounts in the Annual Reports of the Governor of the Territory of Hawaii

An examination of the history of leprosy, or Hansen’s disease, in the Territory of Hawaii is a clear window upon how the federal government addressed its fundamental responsibilities to an indigenous people of this nation. Over the years, and in particular prior to 1934, various federal agencies oversaw the array of this nation’s territories, but the Department of the Interior was always accountable for those of Alaska and Hawaii. Each agency acquired annual reports from the assigned administrators of such areas. These federal documents offer a remarkable perspective of these diverse geographic locations, and contain data on aspects of local life that are difficult to find elsewhere. This article speaks specifically to the leprosy reports contained in the Annual Reports for the Territory of Hawaii, between 1900 and 1959

Evaluation des performances relatives, risque et entrée

Cet article introduit un problème d'aléa moral avec action cachée dans un cadre de duopole à la Cournot. Nous comparons à l'équilibre les profits nets des entreprises selon que les dirigeants sont évalués sur une base absolue ou relative. Nous montrons, notamment, l'existence d'un seuil d'aversion au risque pour lequel ces profits sont identiques quel que soit le régime incitatif. Nous appliquons ensuite ce résultat à la décision d'entrée.Performances relatives, aversion au risque, barrières à l’entrée.

Spin Hall effect at interfaces between HgTe/CdTe quantum wells and metals

We study the spin-dependent transmission through interfaces between a HgTe/CdTe quantum well (QW) and a metal for both the normal metal and the superconducting cases. Interestingly, we discover a type of spin Hall effect at these interfaces that happens to exist even in the absence of structure and bulk inversion asymmetry within each subsystem (i.e., the QW and the metal). Thus, this is a pure boundary spin Hall effect which can be directly related to the existence of exponentially localized edge states at the interface. We demonstrate how this effect can be measured and functionalized for an all-electric spin injection into normal metal leads