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Vibrational sidebands and the Kondo effect in molecular transistors.

Physical review letters

Paaske J, Flensberg K.
PMID: 15904323
Phys Rev Lett. 2005 May 06;94(17):176801. doi: 10.1103/PhysRevLett.94.176801. Epub 2005 May 02.

Electron transport through molecular quantum dots coupled to a single vibrational mode is studied in the Kondo regime. We apply a generalized Schrieffer-Wolff transformation to determine the effective low-energy spin-spin-vibron interaction. From this model we calculate the nonlinear conductance...

Electronic excitations of a single molecule contacted in a three-terminal configuration.

Nano letters

Osorio EA, O'Neill K, Wegewijs M, Stuhr-Hansen N, Paaske J, Bjørnholm T, van der Zant HS.
PMID: 17941679
Nano Lett. 2007 Nov;7(11):3336-42. doi: 10.1021/nl0715802. Epub 2007 Oct 17.

Low-temperature three-terminal transport measurements through a thiol end-capped pi-conjugated molecule have been carried out. Electronic excitations, including zero and finite-bias Kondo-effects, have been observed and studied as a function of magnetic field. Using a simplified two-orbital model, we have...

Getting a Grip on the Undrugged: Targeting β-Catenin with Fragment-Based Methods.


Kessler D, Mayer M, Zahn SK, Zeeb M, Wöhrle S, Bergner A, Bruchhaus J, Ciftci T, Dahmann G, Dettling M, Döbel S, Fuchs JE, Geist L, Hela W, Kofink C, Kousek R, Moser F, Puchner T, Rumpel K, Scharnweber M, Werni P, Wolkerstorfer B, Breitsprecher D, Baaske P, Pearson M, McConnell DB, Böttcher J.
PMID: 33275320
ChemMedChem. 2021 May 06;16(9):1420-1424. doi: 10.1002/cmdc.202000839. Epub 2021 Jan 14.

Aberrant WNT pathway activation, leading to nuclear accumulation of β-catenin, is a key oncogenic driver event. Mutations in the tumor suppressor gene APC lead to impaired proteasomal degradation of β-catenin and subsequent nuclear translocation. Restoring cellular degradation of β-catenin...

Tunable Magnetic Anisotropy from Higher-Harmonics Exchange Scattering on the Surface of a Topological Insulator.

Physical review letters

Paaske J, Gaidamauskas E.
PMID: 27824441
Phys Rev Lett. 2016 Oct 21;117(17):177201. doi: 10.1103/PhysRevLett.117.177201. Epub 2016 Oct 20.

We show that higher-harmonics exchange scattering from a magnetic adatom on the surface of a three dimensional topological insulator leads to a magnetic anisotropy whose magnitude and sign may be tuned by adjusting the chemical potential of the helical...

Kondo blockade due to quantum interference in single-molecule junctions.

Nature communications

Mitchell AK, Pedersen KGL, Hedegård P, Paaske J.
PMID: 28492236
Nat Commun. 2017 May 11;8:15210. doi: 10.1038/ncomms15210.

Molecular electronics offers unique scientific and technological possibilities, resulting from both the nanometre scale of the devices and their reproducible chemical complexity. Two fundamental yet different effects, with no classical analogue, have been demonstrated experimentally in single-molecule junctions: quantum...

Transconductance of a double quantum dot system in the Kondo regime.

Physical review letters

Koerting V, Wölfle P, Paaske J.
PMID: 17678313
Phys Rev Lett. 2007 Jul 20;99(3):036807. doi: 10.1103/PhysRevLett.99.036807. Epub 2007 Jul 20.

We consider a lateral double-dot system in the Coulomb blockade regime with a single spin-1/2 on each dot, mutually coupled by an antiferromagnetic exchange interaction. Each of the two dots is contacted by two leads. We demonstrate that the...

Kondo-enhanced Andreev tunneling in InAs nanowire quantum dots.

Physical review letters

Sand-Jespersen T, Paaske J, Andersen BM, Grove-Rasmussen K, Jørgensen HI, Aagesen M, Sørensen CB, Lindelof PE, Flensberg K, Nygård J.
PMID: 17930535
Phys Rev Lett. 2007 Sep 21;99(12):126603. doi: 10.1103/PhysRevLett.99.126603. Epub 2007 Sep 19.

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 subgap peaks at |V(sd)| = Delta/e markedly stronger (weaker)...

Ground-State Spin Blockade in a Single-Molecule Junction.

Physical review letters

de Bruijckere J, Gehring P, Palacios-Corella M, Clemente-León M, Coronado E, Paaske J, Hedegård P, van der Zant HSJ.
PMID: 31144938
Phys Rev Lett. 2019 May 17;122(19):197701. doi: 10.1103/PhysRevLett.122.197701.

It is known that the quantum mechanical ground state of a nanoscale junction has a significant impact on its electrical transport properties. This becomes particularly important in transistors consisting of a single molecule. Because of strong electron-electron interactions and...

Current-Induced Gap Opening in Interacting Topological Insulator Surfaces.

Physical review letters

Balram AC, Flensberg K, Paaske J, Rudner MS.
PMID: 31922820
Phys Rev Lett. 2019 Dec 13;123(24):246803. doi: 10.1103/PhysRevLett.123.246803.

Two-dimensional topological insulators (TIs) host gapless helical edge states that are predicted to support a quantized two-terminal conductance. Quantization is protected by time-reversal symmetry, which forbids elastic backscattering. Paradoxically, the current-carrying state itself breaks the time-reversal symmetry that protects...

Incipient nodal pairing in planar d-wave superconductors.

Physical review letters

Khveshchenko DV, Paaske J.
PMID: 11384311
Phys Rev Lett. 2001 May 14;86(20):4672-5. doi: 10.1103/PhysRevLett.86.4672.

The possibility of a second pairing transition d --> d + is ( d + id') in planar d-wave superconductors which occurs in the absence of external magnetic field, magnetic impurities, or boundaries is established in the framework of...

Novel microscale approaches for easy, rapid determination of protein stability in academic and commercial settings.

Biochimica et biophysica acta

Alexander CG, Wanner R, Johnson CM, Breitsprecher D, Winter G, Duhr S, Baaske P, Ferguson N.
PMID: 25262836
Biochim Biophys Acta. 2014 Dec;1844(12):2241-50. doi: 10.1016/j.bbapap.2014.09.016. Epub 2014 Sep 28.

Chemical denaturant titrations can be used to accurately determine protein stability. However, data acquisition is typically labour intensive, has low throughput and is difficult to automate. These factors, combined with high protein consumption, have limited the adoption of chemical...

Magnetic-field dependence of tunnel couplings in carbon nanotube quantum dots.

Physical review letters

Grove-Rasmussen K, Grap S, Paaske J, Flensberg K, Andergassen S, Meden V, Jørgensen HI, Muraki K, Fujisawa T.
PMID: 22680891
Phys Rev Lett. 2012 Apr 27;108(17):176802. doi: 10.1103/PhysRevLett.108.176802. Epub 2012 Apr 26.

By means of sequential and cotunneling spectroscopy, we study the tunnel couplings between metallic leads and individual levels in a carbon nanotube quantum dot. The levels are ordered in shells consisting of two doublets with strong- and weak-tunnel couplings,...

Showing 1 to 12 of 28 entries