Now showing items 1-20 of 35

• #### Charge Fractionalization in Non-Chiral Luttinger Systems ﻿

(Elsevier, 2008)
One-dimensional metals, such as quantum wires or carbon nanotubes, can carry charge in arbitrary units, smaller or larger than a single electron charge. However, according to Luttinger theory, which describes the low-energy ...
• #### Charge Fractionalization in Quantum Wires ﻿

(Nature Publishing Group, 2008)
Although the unit of charge in nature is a fundamental constant, the charge of individual quasiparticles in some low-dimensional systems may be fractionalized. Quantum one-dimensional (1D) systems, for instance, are ...
• #### Collective States of Non-Abelian Quasiparticles in a Magnetic Field ﻿

(American Physical Society, 2009)
Motivated by the physics of the Moore-Read nu=1/2 state away from half filling, we investigate collective states of non-Abelian e/4 quasiparticles in a magnetic field. We consider two types of collective states: incompressible ...
• #### Controlled finite momentum pairing and spatially varying order parameter in proximitized HgTe quantum wells ﻿

(Springer Nature, 2016)
Conventional s-wave superconductivity is understood to arise from singlet pairing of electrons with opposite Fermi momenta, forming Cooper pairs whose net momentum is zero[1]. Several recent studies have focused on structures ...
• #### Decay of superfluid currents in a moving system of strongly interacting bosons ﻿

(American Physical Society (APS), 2005)
We analyze the stability and decay of supercurrents of strongly interacting bosons on optical lattices. At the mean-field level, the system undergoes an irreversible dynamic phase transition, whereby the current decays ...
• #### Detecting Majorana modes in one-dimensional wires by charge sensing ﻿

(American Physical Society (APS), 2015)
The electron number parity of the ground state of a semiconductor nanowire proximity coupled to a bulk superconductor can alternate between the quantized values ±1 if parameters such as the wire length L, the chemical ...
• #### Detecting Non-Abelian Anyons by Charging Spectroscopy ﻿

(American Physical Society (APS), 2013)
Observation of non-Abelian statistics for the $e/4$ quasiparticles in the $\nu =\frac{5}{2}$ fractional quantum Hall state remains an outstanding experimental problem. The non-Abelian statistics are linked to the ...
• #### Driven Nonlinear Dynamics of Two Coupled Exchange-Only Qubits ﻿

(American Physical Society (APS), 2014)
Inspired by the creation of a fast exchange-only qubit [Medford et al., Phys. Rev. Lett. 111, 050501 (2013)], we develop a theory describing the nonlinear dynamics of two such qubits that are capacitively coupled, when one ...
• #### Dynamic Nuclear Polarization in Double Quantum Dots ﻿

(American Physical Society, 2010)
We theoretically investigate the controlled dynamic polarization of lattice nuclear spins in GaAs double quantum dots containing two electrons. Three regimes of long-term dynamics are identiﬁed, including the buildup of ...
• #### Electron-hole asymmetric integer and fractional quantum Hall effect in bilayer graphene ﻿

(American Association for the Advancement of Science (AAAS), 2014)
The nature of fractional quantum Hall (FQH) states is determined by the interplay between the Coulomb interaction and the symmetries of the system. The unique combination of spin, valley, and orbital degeneracies in bilayer ...
• #### Exact CNOT gates with a single nonlocal rotation for quantum-dot qubits ﻿

(American Physical Society (APS), 2015)
We investigate capacitively-coupled exchange-only two-qubit quantum gates based on quantum dots. For exchange-only coded qubits electron spin S and its projection Sz are exact quantum numbers. Capacitive coupling between ...
• #### Fractional Quantum Hall Phase Transitions and Four-Flux States in Graphene ﻿

(American Physical Society (APS), 2013)
Graphene and its multilayers have attracted considerable interest because their fourfold spin and valley degeneracy enables a rich variety of broken-symmetry states arising from electron-electron interactions, and raises ...
• #### Hartree-Fock calculations of a ﬁnite inhomogeneous quantum wire ﻿

(The American Physical Society, 2008)
We use the Hartree-Fock method to study an interacting one-dimensional electron system on a finite wire, partially depleted at the center by a smooth potential barrier. A uniform 1 T Zeeman field is applied throughout the ...
• #### Imaging and Manipulating Electrons in a 1D Quantum Dot with Coulomb Blockade Microscopy ﻿

(American Physical Society, 2010)
Motivated by the recent experiments by the Westervelt group using a mobile tip to probe the electronic state of quantum dots formed on a segmented nanowire, we study the shifts in Coulomb blockade peak positions as a ...
• #### Kondo Screening Cloud and the Charge Staircase in One-Dimensional Mesoscopic Devices ﻿

(American Physical Society, 2008)
We propose that the finite size of the Kondo screening cloud, ξK , can be probed by measuring the charge quantization in a one-dimensional system coupled to a small quantum dot. When the chemical potential μ in the system ...
• #### Magnetoplasmon excitations and spin density instabilities in an integer quantum Hall system with a tilted magnetic field ﻿

(American Physical Society (APS), 2002)
We study the magnetoplasmon collective-mode excitations of integer quantum Hall systems in a paraboli- cally confined quantum well nanostructure in the presence of a tilted magnetic field by using the time- dependent ...
• #### Microscopic Properties of the Fractional Quantum Hall Effect ﻿

(2013-10-18)
The fractional quantum Hall effect occurs when an extremely clean 2-dimensional fermion gas is subject to a magnetic field. This simple set of circumstances creates phenomena, such as edge reconstruction and fractional ...
• #### Microwave-induced zero-resistance states are not necessarily static ﻿

(American Physical Society, 2009)
We study the effect of inhomogeneities in Hall conductivity on the nature of the zero resistance states seen in the microwave irradiated two-dimensional electron systems in weak perpendicular magnetic fields and show that ...