Yonatan Cohen – författare
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3 produkter
3 produkter
Inbunden, Engelska, 2019
1 082 kr
Skickas inom 10-15 vardagar
In the last several decades, the quantum Hall effect has provided a remarkable platform for manipulating one-dimensional electronic modes and investigating fundamental physical phenomena. However, certain limitations make it difficult for various kinds of interesting modes structures to be formed using this platform. One example is the so called helical mode structure, in which two one-dimensional, counter propagating modes have opposite spins and thus spin and momentum are locked. Such helical modes have lately attracted significant interest, since, when coupled to a conventional superconductor, they are expected to manifest topological superconductivity and host Majorana zero modes. Even more interesting are fractional helical modes, which open the way for realizing generalized parafermionic zero modes. Possessing non-abelian exchange statistics, these quasiparticles may serve as building blocks in topological quantum computing. Here we present a new platform for manipulating integer and fractional quantum Hall edge modes, which allows the formation of robust one-dimensional helical as well as fractional helical modes. The platform is based on a carefully designed double-quantum-well structure in a GaAs based system hosting two electronic sub-bands in the quantum Hall effect regime. By electrostatic gating of different areas of the structure, counter-propagating integer, as well as fractional, edge modes with opposite spins are formed and their spin protection is verified. Beyond the formation of helical modes, the new platform can serve as a rich playground for new research. Some new possibilities include the artificial induction of compounded fractional edge modes and the construction of new edge mode-based interferometers.
E-bok
Engelska, 20191 416 kr
Läs direkt efter köp
In the last several decades, the quantum Hall effect has provided a remarkable platform for manipulating one-dimensional electronic modes and investigating fundamental physical phenomena. However, certain limitations make it difficult for various kinds of interesting modes structures to be formed using this platform. One example is the so called helical mode structure, in which two one-dimensional, counter propagating modes have opposite spins and thus spin and momentum are locked. Such helical modes have lately attracted significant interest, since, when coupled to a conventional superconductor, they are expected to manifest topological superconductivity and host Majorana zero modes. Even more interesting are fractional helical modes, which open the way for realizing generalized parafermionic zero modes. Possessing non-abelian exchange statistics, these quasiparticles may serve as building blocks in topological quantum computing. Here we present a new platform for manipulating integer and fractional quantum Hall edge modes, which allows the formation of robust one-dimensional helical as well as fractional helical modes. The platform is based on a carefully designed double-quantum-well structure in a GaAs based system hosting two electronic sub-bands in the quantum Hall effect regime. By electrostatic gating of different areas of the structure, counter-propagating integer, as well as fractional, edge modes with opposite spins are formed and their spin protection is verified. Beyond the formation of helical modes, the new platform can serve as a rich playground for new research. Some new possibilities include the artificial induction of compounded fractional edge modes and the construction of new edge mode-based interferometers.
Häftad, Engelska, 2021
267 kr
Skickas inom 7-10 vardagar
The biblical metaphor of a “Land of Milk and Honey” has denoted for millennia a prophecy and promise for plenitude. This book, published in conjunction with the Israeli Pavilion at the 17th International Architecture Exhibition of the Venice Biennale, examines the reciprocal relations between humans, animals, and the environment within the context of modern Palestine-Israel, and demonstrates how this promise has become an action-plan over the course of the twentieth century.Through this lens, Land. Milk. Honey investigates how colonialism, settlement, urbanisation, infrastructure, and mechanised agriculture radically reshaped the environment of the contested territory of Palestine-Israel, and altered human-animal relationships. It shows how the celebrated metamorphosis of the region into a prosperous agricultural landscape was entangled with irreparable damage to the local fauna and flora, as well as the disruption of human communities and ways of living. And it highlights the predicaments that both the environment and its inhabitants are facing after the territory has over a century been the test bed of modernist aspirations for plenitude.The fundamental changes the region has gone through are portrayed through the stories of five local animals: cow, goat, honey-bee, water-buffalo, and bat. These case-studies and a zoo-centric analysis construct a spatial history of a place in five acts: Mechanization Territory, Cohabitation, Extinction and the Post-Human. A rich collection of literary excerpts, historical documents, archival photos, as well as short original vignettes brings about the story of this remarkable transfiguration and redesign.