Coherent Transport Through a Quadruple Point in a Few Electron Triple Dot (2006)
Gaudreau, L., Sachrajda, A. S., Studenikin, S., Zawadzki, P., Kam, A., Lapointe, J.
A few electron double electrostatic lateral quantum dot can be transformed into a few electron triple quantum dot by applying a different combination of gate voltages. Quadruple points have been...
Charge Sensing of an Artificial H2+ Molecule (2005)
Pioro-Ladriere, M., Abolfath, M. R., Zawadzki, P., Lapointe, J., Studenikin, S. A., Sachrajda, A. S., ...
We report charge detection studies of a lateral double quantum dot with controllable charge states and tunable tunnel coupling. Using an integrated electrometer, we characterize the equilibrium state...
The origin of switching noise in GaAs/AlGaAs lateral gated devices (2005)
Pioro-Ladrière, M., Davies, J. H., Long, A. R., Sachrajda, A. S., Gaudreau, L., Zawadzki, P., ...
We have studied the origin of switching (telegraph) noise at low temperature in lateral quantum structures defined electrostatically in GaAs/AlGaAs heterostructures by surface gates. The noise was...
Ciorga, M., Pioro-Ladrière, M., Zawadzki, P., Lapointe, J., Wasilewski, Z., Sachrajda, A. S.
We present Coulomb Blockade measurements of two few-electron quantum dots in series which are configured such that the electrochemical potential of one of the two dots is aligned with spin-selective...
Spin splitting in open quantum dots (2003)
Evaldsson, M., Zozoulenko, I. V., Ciorga, M., Zawadzki, P., Sachrajda, A. S.
We present results from a theoretical and experimental study of spin-splitting in small open lateral quantum dots (i.e. in the regime when the dot is connected to the reservoirs via leads that...
Spin-blockade spectroscopy of a two-level artificial molecule (2003)
Pioro-Ladriere, M., Ciorga, M., Lapointe, J., Zawadzki, P., Korkusinski, M., Hawrylak, P., ...
Coulomb and spin blockade spectroscopy investigations have been performed on an electrostatically defined ``artificial molecule'' connected to spin polarized leads. The molecule is first effectively...
Metallic and Insulating behaviour in p-SiGe at nu = 3/2 (2002)
Coleridge, P. T., Williams, R. L., Lapointe, J., Zawadzki, P.
Shubnikov-de Haas data is presented for a p-SiGe sample exhibiting strongly insulating behaviour at nu = 3/2. In addition to the fixed points defining a high field metal- insulator transition into...
Ciorga, M., Pioro-Ladriere, M., Zawadzki, P., Hawrylak, P., Sachrajda, A. S.
We demonstrate a tunable negative differential resistance controlled by spin blockade in single electron transistors. The single electron transistors containing a few electrons and spin polarized...
Interaction effects and the metallic phase in p-SiGe (2000)
Coleridge, P. T., Sachrajda, A. S., Zawadzki, P.
Magnetoresistance results are presented for p-SiGe samples on the metallic side of the B=0 metal-insulator transition. The results cannot be understood within the framework of standard theories for...
Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy (2000)
Ciorga, M., Sachrajda, A. S., Hawrylak, P., Gould, C., Zawadzki, P., Jullian, S., ...
Fabrication of parallel quantum point contacts with submicron airbridges (2000)
Feng, Y., Sachrajda, A. S., Zawadzki, P., Kolind, S., Buchanan, M., Smet, J. H., ...
The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy (1999)
Ciorga, M., Sachrajda, A. S., Hawrylak, P., Gould, C., Zawadzki, P., Jullian, S., ...
Transport measurements are presented on a class of electrostatically defined lateral dots within a high mobility two dimensional electron gas (2DEG). The new design allows Coulomb Blockade(CB)...
Weak localisation, interaction effects and the metallic phase in p-SiGe (1999)
Coleridge, P. T., Sachrajda, A. S., Zawadzki, P.
Magnetoresistance results are presented for p-SiGe samples on the metallic side of the B=0 metal-insulator transition. It was possible to separate the weak localisation and Zeeman interaction effects...
Spin depolarization in quantum dots (1999)
Sachrajda,A.S., Gould,C., Hawrylak,P., Feng,Y., Zawadzki,P., Wasilewski,Z.
We have performed single electron spectroscopy experiments on single lateral quantum dots. We demonstrate that the lateral nature of the tunneling as well as the properties of the 2DEG leads can be...
Quantum Phase Transitions in the p-SiGe system (1999)
Coleridge, P. T., Zawadzki, P., Sachrajda, A., Feng, Y., Williams, R. L.
The rich variety of phase transitions observed in the strained p-SiGe system are considered and compared. It is shown that the integer quantum Hall effect transitions, the Hall insulating transition...
Universal Behaviour of Metal-Insulator Transitions in the p-SiGe System (1999)
Coleridge, P. T., Zawadzki, P., Sachrajda, A. S., Williams, R. L., Feng, Y.
Magnetoresistance measurements are presented for a strained p-SiGe quantum well sample where the density is varied through the B=0 metal-insulator transition. The close relationship between this...
On the thermal broadening of a quantum critical phase transition (1999)
Coleridge, P. T., Zawadzki, P.
The temperature dependence of an integer Quantum Hall effect transition is studied in a sample where the disorder is dominated by short-ranged potential scattering. At low temperatures the results...
Adiabatic Behaviour of a 2-D Hole Gas near the B=0 Metal-Insulator transition (1998)
Coleridge, P. T., Sachrajda, A. S., Zawadzki, P., Williams, R. L., Feng, Y.
No abstract available.
Metal Insulator transition at B=0 in p-SiGe (1997)
Coleridge, P. T., Williams, R. L., Feng, Y., Zawadzki, P.
Observations are reported of a metal-insulator transition in a 2D hole gas in asymmetrically doped strained SiGe quantum wells. The metallic phase, which appears at low temperatures in these high...
The Quantum Hall Effect and Inter-edge State Tunneling Within a Barrier (1995)
Johnson, B. L., Sachrajda, A. S., Kirczenow, G., Feng, Y., Taylor, R. P., Henning, L., ...
We have introduced a controllable nano-scale incursion into a potential barrier imposed across a two-dimensional electron gas, and report on the phenomena that we observe as the incursion develops....
Homology among nearly all plasmids infecting three Bacillus species.
Zawadzki, P, Riley, M A, Cohan, F M
We have surveyed naturally occurring plasmids in strains of Bacillus subtilis and the closely related species B. mojavensis and B. licheniformis. Previous studies have failed to find host-benefitting...
Zawadzki, P., Roberts, M. S., Cohan, F. M.
The relationship between sexual isolation and sequence divergence in Bacillus transformation was previously shown to be log linear. In the present study, we have shown that this relationship is...
The Size and Continuity of DNA Segments Integrated in Bacillus Transformation
We investigated the size and continuity of DNA segments integrated in Bacillus subtilis transformation. We transformed B. subtilis strain 1A2 toward rifampicin resistance (coded by rpoB) with genomic...
Homology among nearly all plasmids infecting three Bacillus species.
Zawadzki, P, Riley, M A, Cohan, F M
We have surveyed naturally occurring plasmids in strains of Bacillus subtilis and the closely related species B. mojavensis and B. licheniformis. Previous studies have failed to find host-benefitting...
Zawadzki, P., Roberts, M. S., Cohan, F. M.
The relationship between sexual isolation and sequence divergence in Bacillus transformation was previously shown to be log linear. In the present study, we have shown that this relationship is...
The Size and Continuity of DNA Segments Integrated in Bacillus Transformation
We investigated the size and continuity of DNA segments integrated in Bacillus subtilis transformation. We transformed B. subtilis strain 1A2 toward rifampicin resistance (coded by rpoB) with genomic...