Hong Kong as a property jurisdiction

Purpose This study aims to explore how urban governance of Hong Kong is impacted by the formulation and implementation of the new constitutional order of “one country, two systems” that distinguishes between the British colonial government and the current government under Chinese sovereignty. Design/methodology/approach While the literature recognises the society of Hong Kong has been heavily relying on land and property activities, few attempts notice the uniqueness of Hong Kong’s sequential constitutional orders and its relations to those activities. This study presents a geographical enquiry and an archival study to illustrate the spatiality of the new constitutional order and its implications on land injustice. Drawing from the works of legal geography and urban studies, this study extends and clarifies Anne Haila’s conception of Hong Kong as “property state” to “property jurisdiction”. Findings Though common law and leasehold land system were perpetuated from the colonial period, the new constitutional order changed their practices and the underlying logic and ideology. The urban governance order of this property jurisdiction is intended for prosperity and stability of the society, and for the economic benefit and territorial integrity claim of the Chinese sovereignty. Originality/value This study enriches the literature of Hong Kong studies in three major areas, namely, the relationship with China, urban governance and land injustice. It offers a conceptual discussion, which contributes to comparative territorial autonomies studies. It also contributes to legal geography by providing insights beyond the western liberal democracy model

Topological Excitations in Spinor Bose-Einstein Condensates

We investigate the properties of skyrmion in the ferromagnetic state of spin-1 Bose-Einstein condensates by means of the mean-field theory and show that the size of skyrmion is fixed to the order of the healing length. It is shown that the interaction between two skyrmions with oppositely rotating spin textures is attractive when their separation is large, following a unique power-law behavior with a power of -7/2.Comment: 4 pages, 5 figure

Phase diagram of asymmetric Fermi gas across Feshbach resonance

We study the phase diagram of the dilute two-component Fermi gas at zero temperature as a function of the polarization and coupling strength. We map out the detailed phase separations between superfluid and normal states near the Feshbach resonance. We show that there are three different coexistence of superfluid and normal phases corresponding to phase separated states between: (I) the partially polarized superfluid and the fully polarized normal phases, (II) the unpolarized superfluid and the fully polarized normal phases and (III) the unpolarized superfluid and the partially polarized normal phases from strong-coupling BEC side to weak-coupling BCS side. For pairing between two species, we found this phase separation regime gets wider and moves toward the BEC side for the majority species are heavier but shifts to BCS side and becomes narrow if they are lighter.Comment: 4 pages, 3 figures. Submitted to LT25 on June 200

Josephson Current between Triplet and Singlet Superconductors

The Josephson effect between triplet and singlet superconductors is studied. Josephson current can flow between triplet and singlet superconductors due to the spin-orbit coupling in the spin-triplet superconductor but it is finite only when triplet superconductor has $L_z=-S_z=\pm 1$, where $L_z$ and $S_z$ are the perpendicular components of orbital angular momentum and spin angular momentum of the triplet Cooper pairs, respectively. The recently observed temperature and orientational dependence of the critical current through a Josephson junction between UPt$_3$ and Nb is investigated by considering a non-unitary triplet state.Comment: 4 pages, no figure

Magnetic Field Effect on the Supercurrent of an SNS junction

In this paper we study the effect of a Zeeman field on the supercurrent of a mesoscopic SNS junction. It is shown that the supercurrent suppression is due to a redistribution of current-carrying states in energy space. A dramatic consequence is that (part of the) the suppressed supercurrent can be recovered with a suitable non-equilibrium distribution of quasiparticles.Comment: 4 figures in postscrip