Detecting Induced 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mo>±</mml:mo><mml:mi>i</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math>
 Pairing at the Al-InAs Interface with a Quantum Microwave Circuit

Phan, D.; Senior, Jorden; Ghazaryan, Areg; Hatefipour, Mehdi; Strickland, William; Shabani, Javad; Serbyn, Maksym; Higginbotham, Andrew

doi:10.1103/physrevlett.128.107701

Cited by 17 publications

(58 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…the Fermi momentum of the semiconductor. We note that the choice of ∆ and g n /g s corresponds to the experimentally relevant regime, as observed, e.g., in Al/InAs heterostructures 15,20 . In the following, we calculate the differential conductance and the Fano factor as a function of junction transparency Z, SOC strength λ, and Zeeman field V s , for different field orientations θ.…”

Section: Model Definitionmentioning

confidence: 74%

“…1. The superconductor is assumed to be of conventional nature with spinsinglet s-wave pairing, while the semiconductor is noncentrosymmetric with a substantial Rashba SOC, as realized in, e.g., Al/InAs heterostructures 15,20 . The semiconductor is separated into two regions by a potential barrier at i x = 0, whose transparency can be controlled experimentally by applying gate voltages.…”

Section: Model Definitionmentioning

confidence: 99%

“…The semiconductor is separated into two regions by a potential barrier at i x = 0, whose transparency can be controlled experimentally by applying gate voltages. Due to proximity to the parent superconductor, the semiconductor at i x > 0 acquires an induced s-wave pair potential 15,[20][21][22][23] . As a result, the hybrid device realizes an effective twodimensional NS junction with tunable potential barrier and in-plane field.…”

Section: Model Definitionmentioning

confidence: 99%

“…For instance, Bogoliubov Fermi surfaces (BFSs) can exist in multi-band superconductors with broken time-reversal symmetry [5][6][7][8][9] , in nodal superconductors with external Zeeman potentials [10][11][12] , and in superconductors carrying large supercurrents 13,14 . In addition, BFSs can be created in superconducting hybrids, such as semiconductor-superconductor heterostructures with strong spin-orbit coupling (SOC) and an external Zeeman field 15,16 . The recent experimental observation of BFSs in superconductor hybrids 14,15 has further stimulated this field.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, BFSs can be created in superconducting hybrids, such as semiconductor-superconductor heterostructures with strong spin-orbit coupling (SOC) and an external Zeeman field 15,16 . The recent experimental observation of BFSs in superconductor hybrids 14,15 has further stimulated this field.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Anomalous Fano factor as a signature of Bogoliubov Fermi surfaces

Banerjee¹,

Ikegaya²,

Schnyder³

2022

Preprint

View full text Add to dashboard Cite

Noise spectroscopy is a key technique to investigate the nature and dynamics of charge carriers in superconductors. The recently discovered superconducting hybrids with Bogoliubov Fermi surfaces exhibit a particularly intriguing and rich charge dynamics, as their charge carriers consist of both Cooper pairs and an extensive number of Bogoliubov quasiparticles. Motivated by this, we compute the noise spectra of Bogoliubov Fermi surfaces and identify their key signatures in the differential conductance and the Fano factor. Specifically, we consider a semiconductor/superconductor hybrid device with an in-plane magnetic field, which exhibits several Bogoliubov Fermi surfaces. The number and orientation of the Bogoliubov Fermi surfaces in this device can be readily controlled by the applied magnetic field, which in turn alters the noise signal. In particular, we find that the Fano factor exhibits a reduced value, substantially lower than two, whenever the charge dynamics is governed by a large number of Bogoliubov quasiparticles. Using experimentally relevant parameters, we make a number of specific predictions for the noise spectra, that can be used as direct evidence of Bogoliubov Fermi surfaces. In particular, we find that the Fano factor as a function of magnetic field and spin-orbit coupling exhibits characteristic discontinuities at the transition lines that separate phases with different number of Bogoliubov Fermi surfaces.

show abstract

Section: Model Definitionmentioning

confidence: 74%

Section: Model Definitionmentioning

confidence: 99%

Section: Model Definitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Anomalous Fano factor as a signature of Bogoliubov Fermi surfaces

Banerjee¹,

Ikegaya²,

Schnyder³

2022

Preprint

View full text Add to dashboard Cite

show abstract

Circuit quantum electrodynamics detection of induced two-fold anisotropic pairing in a hybrid superconductor–ferromagnet bilayer

Bøttcher,

Poniatowski,

Grankin

et al. 2024

Nat. Phys.

View full text Add to dashboard Cite

Hybrid systems represent one of the frontiers in the study of unconventional superconductivity and are a promising platform to realize topological superconducting states. These materials are challenging to probe using many conventional measurement techniques because of their mesoscopic dimensions, and therefore require new experimental probes so that they can be successfully characterized. Here, we demonstrate a probe that enables us to measure the superfluid density of micrometre-size superconductors using microwave techniques drawn from circuit quantum electrodynamics. We apply this technique to a superconductor–ferromagnet bilayer and find that the proximity-induced superfluid density is two-fold anisotropic within the plane of the sample. It also exhibits power-law temperature scaling that is indicative of a nodal superconducting state. These experimental results are consistent with the theoretically predicted signatures of induced triplet pairing with a nodal p-wave order parameter. Moreover, we observe modifications to the microwave response at frequencies near the ferromagnetic resonance, suggesting a coupling between the spin dynamics and induced superconducting order in the ferromagnetic layer. Our experimental technique can be employed more widely, for example to study fragile unconventional superconductivity in low-dimensional materials such as van der Waals heterostructures.

show abstract