Now showing items 1-20 of 73

• #### Broken Symmetry States and Divergent Resistance in Suspended Bilayer Graphene ﻿

(Nature Publishing Group, 2009)
Mono- and bilayer graphene have generated tremendous excitement owing to their unique and potentially useful electronic properties$^1$. Suspending single-layer graphene flakes above the substrate${^2}{^,}{^3}$ has been ...
• #### 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 ...
• #### Charge Noise Spectroscopy Using Coherent Exchange Oscillations in a Singlet-Triplet Qubit ﻿

(American Physical Society (APS), 2013)
Two level systems that can be reliably controlled and measured hold promise as qubits both for metrology and for quantum information science. Since a fluctuating environment limits the performance of qubits in both capacities, ...
• #### Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond ﻿

(American Physical Society, 2010)
We present an experimental and theoretical study of electronic spin decoherence in ensembles of nitrogen-vacancy (NV) color centers in bulk high-purity diamond at room temperature. Under appropriate conditions, we find ...
• #### Coherent Optical Transitions in Implanted Nitrogen Vacancy Centers ﻿

(American Chemical Society (ACS), 2014)
We report the observation of stable optical transitions in nitrogen-vacancy (NV) centers created by ion implantation. Using a combination of high temperature annealing and subsequent surface treatment, we reproducibly ...
• #### Coherent, Mechanical Control of a Single Electronic Spin ﻿

(American Chemical Society (ACS), 2012)
We demonstrate coherent quantum control of a single spin driven by the motion of a mechanical resonator. The motion of a mechanical resonator is magnetically coupled to the electronic spin of a single nitrogen-vacancy ...
• #### 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 ...
• #### Coupled Spins in Diamond: From Quantum Control to Metrology and Many-Body Physics ﻿

(2016-05-16)
The study of quantum mechanics, together with the ability to coherently control and manipulate quantum systems in the lab has led to a myriad of discoveries and real world applications. In this thesis we present experiments ...
• #### Decoherence imaging of spin ensembles using a scanning single-electron spin in diamond ﻿

(Nature Publishing Group, 2015)
The nitrogen-vacancy (NV) defect center in diamond has demonstrated great capability for nanoscale magnetic sensing and imaging for both static and periodically modulated target fields. However, it remains a challenge to ...
• #### Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits ﻿

(American Association for the Advancement of Science (AAAS), 2012)
Quantum computers have the potential to solve certain problems faster than classical computers. To exploit their power, it is necessary to perform interqubit operations and generate entangled states. Spin qubits are a ...
• #### 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 ...
• #### 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 ...
• #### The Effect of Intracavity Field Variation on the Emission Properties of Quantum Cascade Lasers ﻿

(2016-09-14)
A common and powerful simplification in laser physics is to ignore the spatial dependence of the intracavity field intensity, and instead replace it with its average value. This approach can elucidate many aspects of laser ...
• #### Efficient photon detection from color centers in a diamond optical waveguide ﻿

(American Physical Society (APS), 2012)
A common limitation of experiments using color centers in diamond is the poor photon collection efficiency of microscope objectives due to refraction at the diamond interface. We present a simple and effective technique ...
• #### 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 ...
• #### Electronic Phenomena in Two-Dimensional Topological Insulators ﻿

(2016-05-12)
In recent years, two-dimensional electron systems have played an integral role at the forefront of discoveries in condensed matter physics. These include the integer and fractional quantum Hall effects, massless electron ...
• #### Engineering Plasmonic Waves in Two-Dimensional Electron Systems ﻿

(2015-05-08)
Plasmonic waves are waves of mobile charge carriers caused by their collective oscillations. They can be excited in solid-state conducting materials and behave distinctively in different numbers of dimensions. With fabrication ...
• #### Enhanced Single-Photon Emission from a Diamond-Silver Aperture ﻿

(Nature Publishing Group, 2011)
Solid-state quantum emitters, such as the nitrogen-vacancy centre in diamond, are robust systems for practical realizations of various quantum information processing protocols and nanoscale magnetometry schemes at room ...