Patrick W Krantz; Venkat Chandrasekhar
Nonlocal Differential Resistance in AlOx/KTaO3 Heterostructures Journal Article
In: 2022.
Abstract | Links | BibTeX | Tags: Magnetism, Mesoscopic quantum transport, perovskite, spin-orbit scattering
@article{Krantz2022,
title = {Nonlocal Differential Resistance in AlOx/KTaO3 Heterostructures},
author = {Patrick W Krantz and Venkat Chandrasekhar},
url = {https://arxiv.org/abs/2210.12146},
year = {2022},
date = {2022-10-22},
abstract = {Local and nonlocal differential resistance measurements on Hall bars defined in AlOx/KTaO3 heterostructures show anomalous behavior that depends on the crystal orientation and the applied back gate voltage. The local differential resistance is asymmetric in the dc bias current, with an antisymmetric component that grows with decreasing gate voltage. More surprisingly, a large nonlocal differential resistance is observed that extends between measurement probes that are separated by 100s of microns. The potential source of this anomalous behavior is discussed.},
keywords = {Magnetism, Mesoscopic quantum transport, perovskite, spin-orbit scattering},
pubstate = {published},
tppubtype = {article}
}
Venkat Chandrasekhar
Probing the topological band structure of diffusive multiterminal Josephson junction devices with conductance measurements Journal Article
In: Applied Physics Letters, vol. 121, pp. 222601, 2022.
Abstract | Links | BibTeX | Tags: Andreev reflection, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity
@article{nokey,
title = {Probing the topological band structure of diffusive multiterminal Josephson junction devices with conductance measurements},
author = {Venkat Chandrasekhar},
url = {https://arxiv.org/abs/2209.04743
https://aip.scitation.org/doi/full/10.1063/5.0125708},
year = {2022},
date = {2022-09-10},
urldate = {2022-09-10},
journal = {Applied Physics Letters},
volume = {121},
pages = {222601},
abstract = {The energy of an Andreev bound state in a clean normal metal in contact with two superconductors disperses with the difference Δϕ in the superconducting phase between the superconductors in much the same way as the energies of electrons in a one-dimensional crystal disperse with the crystal momentum k of the electrons. A normal metal with n superconductors maps on to a n−1 dimensional crystal, each dimension corresponding to the phase difference ϕi between a specific pair of superconductors. The resulting band structure as a function of the phase differences {Δϕi} has been proposed to have a topological nature, with gapped regions characterized by different Chern numbers separated by regions where the gap in the quasiparticle spectrum closes. A similar complex evolution of the quasiparticle spectrum with {Δϕi} has also been predicted for diffusive normal metals in contact with multiple superconductors. Here we show that the variation of the density of states at the Fermi energy of such a system can be directly probed by relatively simple conductance measurements, allowing rapid characterization of the energy spectrum.},
keywords = {Andreev reflection, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {article}
}
Taewan Noh; Andrew Kindseth; Venkat Chandrasekhar
The Nonlocal Superconducting Quantum Interference Device Journal Article
In: Physical Review B, vol. 104, pp. 064503, 2021.
Abstract | Links | BibTeX | Tags: Andreev reflection, Mesoscopic quantum transport, Proximity effect, Superconductivity
@article{Noh2020,
title = {The Nonlocal Superconducting Quantum Interference Device},
author = {Taewan Noh and Andrew Kindseth and Venkat Chandrasekhar},
url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.104.064503},
doi = {10.1103/PhysRevB.104.064503},
year = {2021},
date = {2021-08-04},
urldate = {2020-11-12},
journal = {Physical Review B},
volume = {104},
pages = {064503},
abstract = {Superconducting quantum interference devices (SQUIDs) that incorporate two superconductor/insulator/superconductor (SIS) Josephson junctions in a closed loop form the core of some of the most sensitive detectors of magnetic and electric fields currently available. SQUIDs in these applications are typically operated with a finite voltage which generates microwave radiation through the ac Josephson effect. This radiation may impact the system being measured. We describe here a SQUID in which the Josephson junctions are formed from strips of normal metal (N) in good electrical contact with the superconductor (S). Such SNS SQUIDs can be operated under a finite voltage bias with performance comparable or potentially better than conventional SIS SQUIDs. However, they also permit a mode of operation that is based on the unusual interplay of quasiparticle currents and supercurrents in the normal metal of the Josephson junction. The method allows measurements of the flux dependence of the critical current of the SNS SQUID without applying a finite voltage bias across the SNS junction, enabling sensitive flux detection without generating microwave radiation.},
keywords = {Andreev reflection, Mesoscopic quantum transport, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {article}
}
Manan Mehta
Interplay between superconductivity and ferromagnetism at the LaAlO3/SrTiO3 interface PhD Thesis
2015.
Links | BibTeX | Tags: AMR, epitaxial, Kondo effect, Magnetic force microscopy, Magnetism, Mesoscopic quantum transport, scanning probe, Superconductivity, vortex dynamics
@phdthesis{Mehta2015,
title = {Interplay between superconductivity and ferromagnetism at the LaAlO3/SrTiO3 interface},
author = {Manan Mehta},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/Manan_Mehta_PhD_Thesis.pdf},
year = {2015},
date = {2015-12-01},
keywords = {AMR, epitaxial, Kondo effect, Magnetic force microscopy, Magnetism, Mesoscopic quantum transport, scanning probe, Superconductivity, vortex dynamics},
pubstate = {published},
tppubtype = {phdthesis}
}
Paul Cadden-Zimansky
Nonlocal Coherence in Normal Metal-Superconductor Nanostructures PhD Thesis
2008.
Links | BibTeX | Tags: Andreev reflection, charge imbalance, crossed andreev reflection, Mesoscopic quantum transport, nanomagnets, phase coherence, Proximity effect, Superconductivity
@phdthesis{Cadden-Zimansky2008,
title = {Nonlocal Coherence in Normal Metal-Superconductor Nanostructures},
author = {Paul Cadden-Zimansky},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/C-Z-Thesis-Final.pdf},
year = {2008},
date = {2008-12-01},
keywords = {Andreev reflection, charge imbalance, crossed andreev reflection, Mesoscopic quantum transport, nanomagnets, phase coherence, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {phdthesis}
}
Zhengfan Zhang
Phase Coherent Electron Transport in Carbon Nanotube Devices PhD Thesis
2006.
Links | BibTeX | Tags: Conductance fluctuations, Kondo effect, Mesoscopic quantum transport, Nanotube
@phdthesis{Zhang2006,
title = {Phase Coherent Electron Transport in Carbon Nanotube Devices},
author = {Zhengfan Zhang},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/ZhangThesis.pdf},
year = {2006},
date = {2006-06-01},
keywords = {Conductance fluctuations, Kondo effect, Mesoscopic quantum transport, Nanotube},
pubstate = {published},
tppubtype = {phdthesis}
}
Zhengfan Zhang; Venkat Chandrasekhar
Signatures of phase coherence in the low-temperature transport properties of multiwall carbon nanotubes Journal Article
In: Physical Review B, vol. 73, no. 7, 2006, ISSN: 1098-0121, 1550-235X.
Links | BibTeX | Tags: Mesoscopic quantum transport, Nanotube, phase coherence
@article{zhang_signatures_2006,
title = {Signatures of phase coherence in the low-temperature transport properties of multiwall carbon nanotubes},
author = { Zhengfan Zhang and Venkat Chandrasekhar},
url = {http://link.aps.org/doi/10.1103/PhysRevB.73.075421},
doi = {10.1103/PhysRevB.73.075421},
issn = {1098-0121, 1550-235X},
year = {2006},
date = {2006-02-01},
urldate = {2016-12-29},
journal = {Physical Review B},
volume = {73},
number = {7},
keywords = {Mesoscopic quantum transport, Nanotube, phase coherence},
pubstate = {published},
tppubtype = {article}
}
Zhigang Jiang; Venkat Chandrasekhar
Quantitative measurements of the thermal resistance of Andreev interferometers Journal Article
In: Physical Review B, vol. 72, pp. 020502(R), 2005.
Abstract | Links | BibTeX | Tags: Andreev reflection, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity
@article{Jiang2005b,
title = {Quantitative measurements of the thermal resistance of Andreev interferometers},
author = {Zhigang Jiang and Venkat Chandrasekhar},
url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.72.020502},
doi = {https://doi.org/10.1103/PhysRevB.72.020502},
year = {2005},
date = {2005-07-08},
journal = {Physical Review B},
volume = {72},
pages = {020502(R)},
abstract = {Using a local thermometry technique, we have been able to quantitatively measure the thermal resistance RT of diffusive Andreev interferometers. We find that RT is strongly enhanced from its normal-state value at low temperatures, and behaves nonlinearly as a function of the thermal current through the sample. We also find that RT oscillates as a function of magnetic flux with a fundamental period corresponding to one flux quantum Φ0=h∕2e, demonstrating the phase-coherent nature of thermal transport in these devices. The magnitude of RT is larger than predicted by recent numerical simulations.},
keywords = {Andreev reflection, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {article}
}
Zhigang Jiang
Thermal Transport Near the Normal-Metal/Superconductor Interface in Mesoscopic Devices PhD Thesis
2005.
Links | BibTeX | Tags: Andreev reflection, charge imbalance, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity
@phdthesis{Jiang2005,
title = {Thermal Transport Near the Normal-Metal/Superconductor Interface in Mesoscopic Devices},
author = {Zhigang Jiang},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/JiangThesis.pdf},
year = {2005},
date = {2005-06-01},
keywords = {Andreev reflection, charge imbalance, Mesoscopic quantum transport, phase coherence, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {phdthesis}
}
Z Zhang; D. A Dikin; R. S Ruoff; V Chandrasekhar
Conduction in carbon nanotubes through metastable resonant states Journal Article
In: Europhysics Letters (EPL), vol. 68, no. 5, pp. 713–719, 2004, ISSN: 0295-5075, 1286-4854.
Links | BibTeX | Tags: Mesoscopic quantum transport, Nanotube, phase coherence
@article{zhang_conduction_2004,
title = {Conduction in carbon nanotubes through metastable resonant states},
author = { Z Zhang and D. A Dikin and R. S Ruoff and V Chandrasekhar},
url = {http://stacks.iop.org/0295-5075/68/i=5/a=713?key=crossref.40daace9248237a3af208d6afdfb1034},
doi = {10.1209/epl/i2004-10266-6},
issn = {0295-5075, 1286-4854},
year = {2004},
date = {2004-01-01},
urldate = {2016-12-28},
journal = {Europhysics Letters (EPL)},
volume = {68},
number = {5},
pages = {713--719},
keywords = {Mesoscopic quantum transport, Nanotube, phase coherence},
pubstate = {published},
tppubtype = {article}
}
José Aumentado
2000.
Links | BibTeX | Tags: AMR, Andreev reflection, charge imbalance, crossed andreev reflection, Magnetism, Mesoscopic quantum transport, phase coherence, Proximity effect, spin transport
@phdthesis{Aumentado2000,
title = {Nonequilibrium and Quantum Transport Phenomena in Mesoscopic Ferromagnet/Superconductor Heterostructures},
author = {José Aumentado},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/AumentadoThesis.pdf},
year = {2000},
date = {2000-12-01},
keywords = {AMR, Andreev reflection, charge imbalance, crossed andreev reflection, Magnetism, Mesoscopic quantum transport, phase coherence, Proximity effect, spin transport},
pubstate = {published},
tppubtype = {phdthesis}
}
M. J. Black; V. Chandrasekhar
Influence of temperature-dependent inelastic scattering on the superconducting proximity effect Journal Article
In: EPL (Europhysics Letters), vol. 50, no. 2, pp. 257, 2000.
Links | BibTeX | Tags: Andreev reflection, Mesoscopic quantum transport, Proximity effect, Superconductivity
@article{black_influence_2000,
title = {Influence of temperature-dependent inelastic scattering on the superconducting proximity effect},
author = { M. J. Black and V. Chandrasekhar},
url = {http://iopscience.iop.org/0295-5075/50/2/257},
year = {2000},
date = {2000-01-01},
urldate = {2015-10-23},
journal = {EPL (Europhysics Letters)},
volume = {50},
number = {2},
pages = {257},
keywords = {Andreev reflection, Mesoscopic quantum transport, Proximity effect, Superconductivity},
pubstate = {published},
tppubtype = {article}
}
Chen-Jung Chien
Transport Phenomena Near The Normal-Metal/Superconducting Interface In Mesoscopic Devices PhD Thesis
1998.
Links | BibTeX | Tags: Andreev reflection, charge imbalance, Mesoscopic quantum transport, phase coherence, Proximity effect
@phdthesis{Chien1998,
title = {Transport Phenomena Near The Normal-Metal/Superconducting Interface In Mesoscopic Devices},
author = {Chen-Jung Chien},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/ChienThesis.pdf},
year = {1998},
date = {1998-12-01},
keywords = {Andreev reflection, charge imbalance, Mesoscopic quantum transport, phase coherence, Proximity effect},
pubstate = {published},
tppubtype = {phdthesis}
}
Jonghwa Eom
Electrical Properties of Mesoscopic Spin Glasses PhD Thesis
1998.
Links | BibTeX | Tags: magnetic impurity, Magnetism, Mesoscopic quantum transport, spin glass, spin transport
@phdthesis{Eom1998,
title = {Electrical Properties of Mesoscopic Spin Glasses},
author = {Jonghwa Eom},
url = {http://www.nano.northwestern.edu/wp-content/uploads/2017/09/EomThesis.pdf},
year = {1998},
date = {1998-06-01},
keywords = {magnetic impurity, Magnetism, Mesoscopic quantum transport, spin glass, spin transport},
pubstate = {published},
tppubtype = {phdthesis}
}
V. Chandrasekhar; P. Santhanam; N. A. Penebre; R. A. Webb; H. Vloeberghs; C. Van Haesendonck; Y. Bruynseraede
Absence of size dependence of the Kondo resistivity Journal Article
In: Phys. Rev. Lett., vol. 72, no. 13, pp. 2053, 1994.
Abstract | Links | BibTeX | Tags: Kondo effect, magnetic impurity, Mesoscopic quantum transport
@article{chandrasekhar_absence_1994,
title = {Absence of size dependence of the Kondo resistivity},
author = { V. Chandrasekhar and P. Santhanam and N. A. Penebre and R. A. Webb and H. Vloeberghs and C. Van Haesendonck and Y. Bruynseraede},
url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.72.2053},
doi = {10.1103/PhysRevLett.72.2053},
year = {1994},
date = {1994-01-01},
urldate = {2016-12-28},
journal = {Phys. Rev. Lett.},
volume = {72},
number = {13},
pages = {2053},
abstract = {We have measured the low temperature resistivity of AuFe wires in the dilute magnetic impurity limit as a function of wire width, temperature, and magnetic field. When the width dependence of the electron-electron interaction contribution to the resistivity is taken into account, the temperature dependence of the remaining Kondo contribution to the resistivity of all samples with the same impurity concentration is identical. Similar behavior is observed for the magnetic field dependent resistivity. Thus, the Kondo contribution to the resistivity is independent of width down to 38 nm, much smaller than the Kondo length $textbackslashensuremathtextbackslashxi_textbackslashmathitK$=textbackslashensuremathtextbackslashElzxh$textbackslashmathitv_textbackslashmathitF$/$textbackslashmathitk_textbackslashmathitB$$textbackslashmathitŦ_textbackslashmathitK$textbackslashensuremathtextbackslashapproxeq10 textbackslashensuremathtextbackslashmum.},
keywords = {Kondo effect, magnetic impurity, Mesoscopic quantum transport},
pubstate = {published},
tppubtype = {article}
}