Abstract:
:Quantum point contacts exhibit mysterious conductance anomalies in addition to well-known conductance plateaus at multiples of 2e(2)/h. These 0.7 and zero-bias anomalies have been intensively studied, but their microscopic origin in terms of many-body effects is still highly debated. Here we use the charged tip of a scanning gate microscope to tune in situ the electrostatic potential of the point contact. While sweeping the tip distance, we observe repetitive splittings of the zero-bias anomaly, correlated with simultaneous appearances of the 0.7 anomaly. We interpret this behaviour in terms of alternating equilibrium and non-equilibrium Kondo screenings of different spin states localized in the channel. These alternating Kondo effects point towards the presence of a Wigner crystal containing several charges with different parities. Indeed, simulations show that the electron density in the channel is low enough to reach one-dimensional Wigner crystallization over a size controlled by the tip position.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Brun B,Martins F,Faniel S,Hackens B,Bachelier G,Cavanna A,Ulysse C,Ouerghi A,Gennser U,Mailly D,Huant S,Bayot V,Sanquer M,Sellier Hdoi
10.1038/ncomms5290subject
Has Abstractpub_date
2014-06-30 00:00:00pages
4290issn
2041-1723pii
ncomms5290journal_volume
5pub_type
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