Transnationalism and Migration: Chinese Migrants in New Zealand

Transnational migration is an integral part of the modern world. Immigration policies, economic initiatives and international agreements of modern natiion-states have shaped the growth of transnational migration. Nation-states classify migrants into different categories for the purpose of border control; they have favoured some groups of migrants over the others. This is particularly true for New Zealand, which has maintained close connections with the United Kingdom and preferred British migrants to other peoples since the nineteenth century. New Zealand has always emphasized the economic integration of migrants into the society. Against this background, Chinese migrants arrived and developed their transnational networks across the Pacific Ocean for familiar, social and economic reasons. This paper discusses the transformation of New Zealand\u27s immigration policies and its impact on transnational practices of Chinese migrants from the past to the present. It begins with a critical account of the early development of immigration policies in New Zealnd. Then it discusses the transnational networks of Chinese migrants in New Zealand throughout the late nineteenth and early twentieth centuries. The core of this study focuses on the different patterns of Chinese migration and settlement in New Zealand after the immigration reform in the 1980s and the emergence of Chinese transnational networks in the recent decades

Tomonaga-Luttinger parameters for quantum wires

The low-energy properties of a homogeneous one-dimensional electron system are completely specified by two Tomonaga-Luttinger parameters $K_{\rho}$ and $v_{\sigma}$. In this paper we discuss microscopic estimates of the values of these parameters in semiconductor quantum wires that exploit their relationship to thermodynamic properties. Motivated by the recognized similarity between correlations in the ground state of a one-dimensional electron liquid and correlations in a Wigner crystal, we evaluate these thermodynamic quantities in a self-consistent Hartree-Fock approximation. According to our calculations, the Hartree-Fock approximation ground state is a Wigner crystal at all electron densities and has antiferromagnetic order that gradually evolves from spin-density-wave to localized in character as the density is lowered. Our results for $K_{\rho}$ are in good agreement with weak-coupling perturbative estimates $K_{\rho}^{pert}$ at high densities, but deviate strongly at low densities, especially when the electron-electron interaction is screened at long distances. $K_{\rho}^{pert}\sim n^{1/2}$ vanishes at small carrier density $n$ whereas we conjecture that $K_{\rho}\to 1/2$ when $n\to 0$, implying that $K_{\rho}$ should pass through a minimum at an intermediate density. Observation of such a non-monotonic dependence on particle density would allow to measure the range of the microscopic interaction. In the spin sector we find that the spin velocity decreases with increasing interaction strength or decreasing $n$. Strong correlation effects make it difficult to obtain fully consistent estimates of $v_{\sigma}$ from Hartree-Fock calculations. We conjecture that v_{\sigma}/\vf\propto n/V_0 in the limit $n\to 0$ where $V_0$ is the interaction strength.Comment: RevTeX, 23 pages, 8 figures include