169 citations · 456 across the 24 of their papers we have counts for
17 papers · 1 filter
On the resilience of magic number theory for conductance ratios of aromatic molecules
Lara Ulčakar, Tomaž Rejec, Jure Kokalj +5
If simple guidelines could be established for understanding how quantum interference (QI) can be exploited to control the flow of electricity through single molecules, then new fun…
Spin Lifetimes in Quantum Dots from Noise Measurements
J. Wabnig, B. W. Lovett, J. H. Jefferson +1
We present a method of obtaining information about spin lifetimes in quantum dots from measurements of electrical transport. The dot is under resonant microwave irradiation and at…
Entanglement and transport anomalies in nanowires
J. H. Jefferson, A. Ramsak, T. Rejec
A shallow potential well in a near-perfect quantum wire will bind a single-electron and behave like a quantum dot, giving rise to spin-dependent resonances of propagating electrons…
Zero-field spin-splitting and spin lifetime in n-InSb/In1-xAlxSb asymmetric quantum well heterostructures
A. M. Gilbertson, M. Fearn, J. H. Jefferson +3
The spin-orbit (SO) coupling parameters for lowest conduction subband due to structural (SIA) and bulk (BIA) inversion asymmetry are calculated for a range of carrier densities in…
Generation of EPR pairs and interconversion of static and flying electron spin qubits
G. Giavaras, J. H. Jefferson, M. Fearn +1
We propose a method of generating fully entangled electron spin pairs using an open static quantum dot and a moving quantum dot, realized by the propagation of a surface acoustic w…
Singlet-triplet filtering and entanglement in a quantum dot structure
G. Giavaras, J. H. Jefferson, M. Fearn +1
We consider two interacting electrons in a semiconductor quantum dot structure which consists of a small dot within a larger dot, and demonstrate a singlet-triplet filtering mechan…
Quantum entanglement generation with surface acoustic waves
G. Giavaras, J. H. Jefferson, A. Ramsak +2
We propose a scheme to produce spin entangled states for two interacting electrons. One electron is bound in a well in a semiconductor quantum wire and the second electron is trans…
Entanglement of two delocalised electrons
A. Ramsak, I. Sega, J. H. Jefferson
Several convenient formulae for the entanglement of two indistinguishable delocalised spin-1/2 particles are introduced. This generalizes the standard formula for concurrence, vali…
Entanglement between static and flying qubits in quantum wires
J. H. Jefferson, A. Ramsak, T. Rejec
A weakly bound electron in a semiconductor quantum wire is shown to become entangled with an itinerant electron via the coulomb interaction. The degree of entanglement and its vari…
Shot noise reduction in quantum wires with "0.7 structure"
A. Ramsak, J. H. Jefferson
Shot noise reduction in quantum wires is interpreted within the model for the ''0.7 structure'' in the conductance of near perfect quantum wires [T. Rejec, A. Ramsak, and J.H. Jeff…
Zener quantum dot spin filter in a carbon nanotube
D. Gunlycke, J. H. Jefferson, S. W. D. Bailey +3
We predict and analyze a novel spin filter in semiconducting carbon nanotubes. By using local electrostatic gates, the conduction and valence bands can be modulated to form a doubl…
Spin-dependent thermoelectric transport coefficients in near-perfect quantum wires
T. Rejec, A. Ramsak, J. H. Jefferson
Thermoelectric transport coefficients are determined for semiconductor quantum wires with weak thickness fluctuations. Such systems exhibit anomalies in conductance near 1/4 and 3/…
Interacting electrons in a nearly straight quantum wire
T. Rejec, A. Ramsak, J. H. Jefferson
The conductance threshold of a clean nearly straight quantum wire in which a single electron is bound is studied. This exhibits spin-dependent conductance anomalies on the rising e…
Anomalies in the conduction edge of quantum wires
T. Rejec, A. Ramsak, J. H. Jefferson
We study the conductance threshold of clean nearly straight quantum wires in which an electron is bound. We show that such a system exhibits spin-dependent conductance structures o…
Magnetic properties of a two-electron quantum dot
C. E. Creffield, J. H. Jefferson, S. Sarkar +1
The low-energy eigenstates of two interacting electrons in a square quantum dot in a magnetic field are determined by numerical diagonalization. In the strong correlation regime, t…
Suppression of Giant Magnetoresistance by a superconducting contact
F. Taddei, S. Sanvito, J. H. Jefferson +1
We predict that current perpendicular to the plane (CPP) giant magnetoresistance (GMR) in a phase-coherent magnetic multilayer is suppressed when one of the contacts is superconduc…
Quantum dots and artificial atoms
John H. Jefferson, Wolfgang Häusler
The electronic properties of nanoscale quantum dots are reviewed. The similarities and differences between these `artificial atoms' and real atoms are discussed and, in particular,…