Edge-mode velocities and thermal coherence of quantum Hall interferometers (2009)
Hu, Zi-Xiang, Rezayi, E. H., Wan, Xin, Yang, Kun
We present comprehensive results on the edge-mode velocities in a quantum Hall droplet with realistic interaction and confinement at various filling fractions. We demonstrate that the charge velocity...
Quasiparticle tunneling in the Moore-Read fractional quantum Hall State (2009)
Chen, Hua, Hu, Zi-Xiang, Yang, Kun, Rezayi, E. H., Wan, Xin
In fractional quantum Hall systems, quasiparticles of fractional charge can tunnel between the edges at a quantum point contact. Such tunneling (or backscattering) processes contribute to charge...
Topological quantum hashing with icosahedral group (2009)
Burrello, Michele, Xu, Haitan, Mussardo, Giuseppe, Wan, Xin
We study an efficient algorithm to hash any single qubit gate (or unitary matrix) into a braid of Fibonacci anyons represented by a product of icosahedral group elements. The algorithm relies on the...
Exploiting Geometric Degrees of Freedom in Topological Quantum Computing (2008)
In a topological quantum computer, braids of non-Abelian anyons in a (2+1)-dimensional space-time form quantum gates, whose fault tolerance relies on the topological, rather than geometric,...
Ground state and edge excitations of quantum Hall liquid at filling factor 2/3 (2008)
Hu, Zi-Xiang, Chen, Hua, Yang, Kun, Rezayi, E. H., Wan, Xin
We present a numerical study of fractional quantum Hall liquid at Landau level filling factor $\nu=2/3$ in a microscopic model including long-range Coulomb interaction and edge confining potential,...
Constructing Functional Braids for Low-Leakage Topological Quantum Computing (2008)
We discuss how to significantly reduce leakage errors in topological quantum computation by introducing an irrelevant error in phase, using the construction of a CNOT gate in the Fibonacci anyon...
Wan, Xin, Hu, Zi-Xiang, Rezayi, E. H., Yang, Kun
We present a comprehensive numerical study of a microscopic model of the fractional quantum Hall system at filling fraction $\nu = 5/2$, based on the disc geometry. Our model includes Coulomb...
Trapping Abelian anyons in fractional quantum Hall droplets (2007)
Hu, Zi-Xiang, Wan, Xin, Schmitteckert, Peter
We study the trapping of Abelian anyons (quasiholes and quasiparticles) by a local potential (e.g., induced by an AFM tip) in a microscopic model of fractional quantum Hall liquids with long-range...
Dynamical structure factor of random antiferromagnetic Heisenberg spin chains (2007)
Xu, Zhaoxin, Ying, Heping, Wan, Xin
Combining quantum Monte Carlo simulations with the maximum entropy method, we study the dynamical structure factor $S(k,\omega)$ of spin-1/2 antiferromagnetic Heisenberg chains with various random...
Wan, Xin, Yang, Kun, Rezayi, E. H.
We study the ground state and low-energy excitations of fractional quantum Hall systems on a disk at filling fraction $\nu = 5/2$, with Coulomb interaction and background confining potential. We find...
Mobility gap in fractional quantum Hall liquids: Effects of disorder and layer thickness (2005)
Wan, Xin, Sheng, D. N., Rezayi, E. H., Yang, Kun, Bhatt, R. N., Haldane, F. D. M.
We study the behavior of two-dimensional electron gas in the fractional quantum Hall regime in the presence of finite layer thickness and correlated disordered potential. Generalizing the Chern...
Universality of the edge tunneling exponent of fractional quantum Hall liquids (2004)
Wan, Xin, Evers, F., Rezayi, E. H.
Recent calculations of the edge tunneling exponents in quantum Hall states appear to contradict their topological nature. We revisit this issue and find no fundamental discrepancies. In a microscopic...
Cui, Qinghong, Wan, Xin, Yang, Kun
We present results of numerical studies of spin quantum Hall transitions in disordered superconductors, in which the pairing order parameter breaks time-reversal symmetry. We focus mainly on p-wave...
Zhou, Chenggang, Kennett, Malcolm P., Wan, Xin, Berciu, Mona, Bhatt, R. N.
Motivated by the recent suggestion of anisotropic effective exchange interactions between Mn spins in Ga$_{1-x}$Mn$_x$As (arising as a result of spin-orbit coupling), we study their effects in...
Sheng, D. N., Wan, Xin, Rezayi, E. H., Yang, Kun, Bhatt, R. N., Haldane, F. D. M.
We study the nu=1/3 quantum Hall state in presence of the random disorder. We calculate the topologically invariant Chern number, which is the only quantity known at present to unambiguously...
Edge reconstruction in the fractional quantum Hall regime (2003)
Wan, Xin, Rezayi, E. H., Yang, Kun
The interplay of electron-electron interaction and confining potential can lead to the reconstruction of fractional quantum Hall edges. We have performed exact diagonalization studies on microscopic...
Spin Waves in Random Spin Chains (2002)
Wan, Xin, Yang, Kun, Zhou, Chenggang, Bhatt, R. N.
We study quantum spin-1/2 Heisenberg ferromagnetic chains with dilute, random antiferromagnetic impurity bonds with modified spin-wave theory. By describing thermal excitations in the language of...
Modified spin-wave study of random antiferromagnetic-ferromagnetic spin chains (2002)
Wan, Xin, Yang, Kun, Bhatt, R. N.
We study the thermodynamics of one-dimensional quantum spin-1/2 Heisenberg ferromagnetic system with random antiferromagnetic impurity bonds. In the dilute impurity limit, we generalize the modified...
Mesoscopic Effects in the Quantum Hall Regime (2001)
We report results of a study of (integer) quantum Hall transitions in a single or multiple Landau levels for non-interacting electrons in disordered two-dimensional systems, obtained by projecting a...
Diluted Magnetic Semiconductors in the Low Carrier Density Regime (2001)
Bhatt, R. N., Berciu, Mona, Kennett, Malcolm P., Wan, Xin
This paper, based on a presentation at the Spintronics 2001 conference, provides a review of our studies on II-VI and III-V Mn-doped Diluted Magnetic Semiconductors. We use simple models appropriate...
Reconstruction of Fractional Quantum Hall Edges (2001)
Wan, Xin, Yang, Kun, Rezayi, E. H.
We study the interplay of interaction, confining potential and effects of finite temperature at the edge of a quantum Hall liquid. Our exact diagonalization calculation indicates that edge...
Search for Multiple Step Integer Quantum Hall Transitions (2001)
Recent experiments in the integer quantum Hall regime seem to find direct transitions from a quantum Hall state with Hall conductance $\sigma_{xy} = n e^2/h $ with integer $n > 1$, to an insulating...
Thesis (M.S.)--University of Wyoming, 2001.
Ferromagnetism in Insulating, Doped Diluted Magnetic Semiconductors (2000)
We report results of a Monte Carlo study of doped, diluted magnetic semiconductors in the low carrier density (insulating) regime. We find that the system undergoes a transition from a paramagnet at...
We describe a Monte Carlo simulation study of the magnetic phase diagram of diluted magnetic semiconductors doped with shallow impurities in the low concentration regime. We show that because of a...
Two-Dimensional Wigner Crystal in Anisotropic Semiconductor (1999)
We investigate the effect of mass anisotropy on the Wigner crystallization transition in a two-dimensional (2D) electron gas. The static and dynamical properties of a 2D Wigner crystal have been...
Reduction of geometric and intensity distortions in echo-planar images /--by Xin Wan. (1996)
Thesis (Ph. D.)--Dept. of Physics, University of Utah, 1996.