Spontaneous emergence of angular momentum Josephson oscillations in coupled annular Bose-Einstein condensates

We investigate the nonlinear dynamics of two coupled annular Bose-Einstein condensates (BECs). For certain values of the coupling strength the nonrotating ground state is unstable with respect to fluctuations in the higher angular momentum modes. The two branched Bogoliubov spectrum exhibits distinct regions of instability enabling one to selectively occupy certain angular momentum modes. For sufficiently long evolution times angular momentum Josephson oscillations spontaneously appear, breaking the initial chiral symmetry of the BECs

Time-Averaged Adiabatic Potentials: Versatile traps and waveguides for ultracold quantum gases

We demonstrate a novel class of trapping potentials, time-averaged adiabatic potentials (TAAP) which allows the generation of a large variety of traps and waveguides for ultracold atoms. Multiple traps can be coupled through controllable tunneling barriers or merged altogether. We present analytical expressions for pancake-, cigar-, and ring- shaped traps. The ring-geometry is of particular interest for guided matter-wave interferometry as it provides a perfectly smooth waveguide of controllable diameter, and thus a tunable sensitivity of the interferometer.Comment: 5 pages, 3 figure

Cryogenic scanning force microscopy of quantum Hall samples: Adiabatic transport originating in anisotropic depletion at contact interfaces

Anisotropic magneto resistances and intrinsic adiabatic transport features are generated on quantum Hall samples based on an (Al,Ga)As/GaAs heterostructure with alloyed Au/Ge/Ni contacts. We succeed to probe the microscopic origin of these transport features with a cryogenic scanning force microscope (SFM) by measuring the local potential distribution within the two-dimensional electron system (2DES). These local measurements reveal the presence of an incompressible strip in front of contacts with insulating properties depending on the orientation of the contact/2DES interface line relatively to the crystal axes of the heterostructure. Such an observation gives another microscopic meaning to the term 'non-ideal contact' used in context with the Landauer-B\"uttiker formalism applied to the quantum Hall effect.Comment: 5 pages, 4 figure

Composite Fermions with Spin Freedom

General rule for the composite fermion transformation, when the spins of the electrons are not polarized is derived. Condition for the quantum phase transition between various spin states is obtained based on the rule. This rule gives foundation for the experimental determination of the mass and $g$-factor of the composite fermion.Comment: 5 pages with 1 ps figure, Revtex, to be published in J. Phys. Soc. Jpn. Vol.68 No.10. Misprints are correcte

The Limits of the Recipe

This article discusses the development and limitations of recipes, and why it is invaluable to allow oneself to make mistakes in the kitchen

Report on the Oxford Symposium on Food and Cookery 2018

The annual Oxford Symposium on Food and Cookery brings together food scholars from different disciplines, but predominantly in history and humanities. However, while continuing its tradition of more than 30 years in food studies, this international gathering also looks to the future, with several activities in the realm of Digital Humanities linked to the conference and its participants

Pineapple Poetry - Studying Literature through a Food Studies Lens

In his essay \u27A Winter Feast\u27, literature professor Paul Schmidt unveils the layers of meaning that Pushkin wove into the description of a New Year’s feast in Eugene Onegin. But unusually, Schmidt continues his essay making the jump from literary criticism to food studies by musing on the various items on the menu without reference to Onegin, but rather to the cultural and philosophical context of food, bringing in such varied references as Brillat-Savarin and Arnold Schwarzenegger. Studying food writing through the lens of literary criticism allows us to penetrate the social and symbolic meanings of food more deeply, while also linking food writing, and thereby food studies, with the fields of culture and literature