Zobrazeno 1 - 10
of 151
pro vyhledávání: '"Aagesen, M."'
Quantum dots exhibit reproducible conductance fluctuations at low temperatures due to electron quantum interference. The sensitivity of these fluctuations to the underlying disorder potential has only recently been fully realized. We exploit this sen
Externí odkaz:
http://arxiv.org/abs/1408.4845
Autor:
MacLeod, S. J., See, A. M., Keane, Z. K., Scriven, P., Micolich, A. P., Aagesen, M., Lindelof, P. E., Hamilton, A. R.
Radio frequency reflectometry is demonstrated in a sub-micron undoped AlGaAs/GaAs device. Undoped single electron transistors (SETs) are attractive candidates to study single electron phenomena due to their charge stability and robust electronic prop
Externí odkaz:
http://arxiv.org/abs/1312.5410
We report a study of transport blockade features in a quantum dot single-electron transistor, based on an undoped AlGaAs/GaAs heterostructure. We observe suppression of transport through the ground state of the dot, as well as negative differential c
Externí odkaz:
http://arxiv.org/abs/1310.4889
Autor:
See, A. M., Pilgrim, I., Scannell, B. C., Montgomery, R. D., Klochan, O., Burke, A. M., Aagesen, M., Lindelof, P. E., Farrer, I., Ritchie, D. A., Taylor, R. P., Hamilton, A. R., Micolich, A. P.
Publikováno v:
Physical Review Letters 108, 196807 (2012)
Disorder increasingly affects performance as electronic devices are reduced in size. The ionized dopants used to populate a device with electrons are particularly problematic, leading to unpredictable changes in the behavior of devices such as quantu
Externí odkaz:
http://arxiv.org/abs/1204.0158
We have fabricated quantum dot single electron transistors, based on AlGaAs/GaAs heterojunctions without modulation doping, which exhibit clear and stable Coulomb blockade oscillations. The temperature dependence of the Coulomb blockade peak lineshap
Externí odkaz:
http://arxiv.org/abs/1003.0240
Publikováno v:
Phys. Rev. Lett. 104, 246804 (2010)
Ferromagnetic proximity effect is studied in InAs nanowire (NW) based quantum dots (QD) strongly coupled to a ferromagnetic (F) and a superconducting (S) lead. The influence of the F lead is detected through the splitting of the spin-1/2 Kondo resona
Externí odkaz:
http://arxiv.org/abs/0910.3237
Autor:
MacLeod, S. J., Chan, K., Martin, T. P., Hamilton, A. R., See, A., Micolich, A. P., Aagesen, M., Lindelof, P. E.
Publikováno v:
Physical Review B 80, 035310 (2009)
We re-examine the quantum tau_q and transport tau_t scattering lifetimes due to background impurities in two-dimensional systems. We show that the well-known logarithmic divergence in the quantum lifetime is due to the non-physical assumption of an i
Externí odkaz:
http://arxiv.org/abs/0906.4161
Autor:
Csonka, S., Hofstetter, L., Freitag, F., Oberholzer, S., Jespersen, T. S., Aagesen, M., Nygard, J., Schonenberger, C.
We study the g-factor of discrete electron states in InAs nanowire based quantum dots. The g values are determined from the magnetic field splitting of the zero bias anomaly due to the spin 1/2-Kondo effect. Unlike to previous studies based on 2DEG q
Externí odkaz:
http://arxiv.org/abs/0808.1492
Autor:
Sand-Jespersen, T., Paaske, J., Andersen, B. M., Grove-Rasmussen, K., Jørgensen, H. I., Aagesen, M., Sørensen, C., Lindelof, P. E., Flensberg, K., Nygård, J.
Publikováno v:
Phys. Rev. Lett. 99, 126603 (2007)
We report measurements of the nonlinear conductance of InAs nanowire quantum dots coupled to superconducting leads. We observe a clear alternation between odd and even occupation of the dot, with sub-gap-peaks at $|V_{sd}|=\Delta/e$ markedly stronger
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703264
We have observed the Kondo effect in strongly coupled semiconducting nanowire quantum dots. The devices are made from indium arsenide nanowires, grown by molecular beam epitaxy, and contacted by titanium leads. The device transparency can be tuned by
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608478