TY - JOUR

T1 - Strong quantum memory at resonant Fermi edges revealed by shot noise

AU - Ubbelohde, N.

AU - Roszak, K.

AU - Hohls, F.

AU - Maire, N.

AU - Haug, R. J.

AU - Novotný, T.

N1 - Funding information: We thank T. Lüdtke and K. Pierz for device fabrication, C. v. Zobeltitz for valuable discussions, and R. Filip for useful comments on the manuscript. This work was supported by the German Excellence Initiative via QUEST (Hannover), by the Czech Science Foundation via Grant No. 204/11/J042 (T. N.), and the TEAM programme of the Foundation for Polish Science, co-financed from the European Regional Development Fund (K. R.).

PY - 2012/5/1

Y1 - 2012/5/1

N2 - Studies of non-equilibrium current fluctuations enable assessing correlations involved in quantum transport through nanoscale conductors. They provide additional information to the mean current on charge statistics and the presence of coherence, dissipation, disorder, or entanglement. Shot noise, being a temporal integral of the current autocorrelation function, reveals dynamical information. In particular, it detects presence of non-Markovian dynamics, i.e., memory, within open systems, which has been subject of many current theoretical studies. We report on low-temperature shot noise measurements of electronic transport through InAs quantum dots in the Fermi-edge singularity regime and show that it exhibits strong memory effects caused by quantum correlations between the dot and fermionic reservoirs. Our work, apart from addressing noise in archetypical strongly correlated system of prime interest, discloses generic quantum dynamical mechanism occurring at interacting resonant Fermi edges.

AB - Studies of non-equilibrium current fluctuations enable assessing correlations involved in quantum transport through nanoscale conductors. They provide additional information to the mean current on charge statistics and the presence of coherence, dissipation, disorder, or entanglement. Shot noise, being a temporal integral of the current autocorrelation function, reveals dynamical information. In particular, it detects presence of non-Markovian dynamics, i.e., memory, within open systems, which has been subject of many current theoretical studies. We report on low-temperature shot noise measurements of electronic transport through InAs quantum dots in the Fermi-edge singularity regime and show that it exhibits strong memory effects caused by quantum correlations between the dot and fermionic reservoirs. Our work, apart from addressing noise in archetypical strongly correlated system of prime interest, discloses generic quantum dynamical mechanism occurring at interacting resonant Fermi edges.

UR - http://www.scopus.com/inward/record.url?scp=84860235379&partnerID=8YFLogxK

U2 - 10.1038/srep00374

DO - 10.1038/srep00374

M3 - Article

AN - SCOPUS:84860235379

VL - 2

JO - Scientific reports

JF - Scientific reports

SN - 2045-2322

M1 - 374

ER -