Parity-preserving and magnetic field–resilient superconductivity in InSb nanowires with Sn shells

Pendharkar, Mihir; Zhang, B.; Wu, Hao; Zarassi, Azarin; Zhang, P.; Dempsey, Connor; Lee, Joon Sue; Harrington, Sean D.; Badawy, Ghada; Gazibegović, Saša; Veld, Roy L. M. Op het; Rossi, Marco; Jung, Jason J.; Chen, A.-H.; Verheijen, Marcel A.; Hocevar, Moïra; Bakkers, Erik P. A. M.; Palmstrøm, Christopher J.; Frolov, Sergey

doi:10.1126/science.aba5211

Cited by 70 publications

(105 citation statements)

References 52 publications

Supporting

Mentioning

101

Contrasting

Order By: Relevance

“…Hybrid semiconducting-superconducting islands can be tuned to exhibit both periodicities [9][10][11][12][13][14][15][16][17][18][19][20]. In particular, a magnetic field can be used to tune the periodicity from 2e to 1e, with an intermediate "even-odd" regime characterized by a bimodal distribution of peak spacings [10].…”

Section: Introductionmentioning

confidence: 99%

Full parity phase diagram of a proximitized nanowire island

et al. 2021

Self Cite

View full text Add to dashboard Cite

We measure the charge periodicity of Coulomb blockade conductance oscillations of a hybrid InSb-Al island as a function of gate voltage and parallel magnetic field. The periodicity changes from 2e to 1e at a gate-dependent value of the magnetic field, B * , decreasing from a high to a low limit upon increasing the gate voltage. In the gate voltage region between the two limits, which our numerical simulations indicate to be the most promising for locating Majorana zero modes, we observe correlated oscillations of peak spacings and heights. For positive gate voltages, the 2e-1e transition with low B * is due to the presence of nontopological states whose energy quickly disperses below the charging energy due to the orbital effect of the magnetic field. Our measurements highlight the importance of a careful exploration of the entire available phase space of a proximitized nanowire as a prerequisite to define future topological qubits.

show abstract

Section: Introductionmentioning

confidence: 99%

Full parity phase diagram of a proximitized nanowire island

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Semiconductor nanowires (NWs) are a widely studied platform for quantum transport devices [1] due to the quasi-1D confinement that stems from the small radius (<100 nm) and high aspect ratio. By combining a semiconductor NW with a superconductor, a topological superconductor can be realized in which Majorana zero modes are expected [2][3][4][5]. By defining quantum dots, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…using gate potentials, spin qubits can be studied, while in NW Josephson junctions gate-tunable transmon qubits were realized [6]. A substantial fraction of the research in the field of NW quantum computation is focused on III-V semiconductors, such as InSb and InAs [2][3][4][5]. Group IV nanowires, such as Ge/Si core-shell wires, were recently used to demonstrate ultrafast spin qubit control [7].…”

Section: Introductionmentioning

confidence: 99%

Growth of PbTe nanowires by molecular beam epitaxy

Schellingerhout¹,

Jong²,

Gomanko³

et al. 2022

Mater. Quantum. Technol.

Self Cite

View full text Add to dashboard Cite

Advances in quantum technology may come from the discovery of new materials systems that improve the performance or allow for new functionality in electronic devices. Lead telluride (PbTe) is a member of the group IV-VI materials family that has significant untapped potential for exploration. Due to its high electron mobility, strong spin-orbit coupling and ultrahigh dielectric constant it can host few-electron quantum dots and ballistic quantum wires with opportunities for control of electron spins and other quantum degrees of freedom. Here, we report the fabrication of PbTe nanowires by molecular beam epitaxy. We achieve defect-free single crystalline PbTe with large aspect ratios up to 50 suitable for quantum devices. Furthermore, by fabricating a single nanowire field effect transistor, we attain bipolar transport, extract the bandgap and observe Fabry-Pérot oscillations of conductance, a signature of quasiballistic transmission.

show abstract

“…Thus far, for a comprehensive understanding of Majorana nanowire systems, various long-and short-range disorder effects [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] have been explored, most of which provide alternative interpretations on experimental results that can be attributed to MZMs. Even though the Majorana filter scheme [71][72][73] could provide a solution to [24,30,41] ∼ 4 [76] ∼ 8.5 [77] exclude many non-Majorana states due to disorder and enhance the Majorana signals, those disorder contamination can significantly destroy their power for testing non-Abelian brading statistics and quantum information processing [11]. The next step towards engineering and detecting MZMs in SM-SC hybrid nanowires has three parallel directions in material aspect.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of PbTe-Pb hybrid nanowires for engineering Majorana zero modes

Cao,

Liu,

et al. 2021

Preprint

View full text Add to dashboard Cite

Epitaxial semiconductor-superconductor (SM-SC) hybrid nanowires are potential candidates for implementing Majorana qubits. Recent experimental and theoretical works show that charged impurities in SM remain a major problem in all existing hybrid nanowires, in which the SM is either InAs or InSb while the SC is mainly Al. Here, we theoretically validate the recently proposed PbTe-Pb hybrid nanowire as a potential candidate for Majorana devices. By studying the electrostatic and electronic properties of PbTe nanowires, we demonstrate that the huge dielectric constant of PbTe endows itself a high tolerance of charged impurity and a negligible screening from holes on electrostatic gates; and therefore, we believe PbTe has potential advantages over InAs and InSb nanowires. Moreover, we find that the effective axial Landé g factor and Rashba spin-orbit coupling strength of PbTe nanowires are comparable to those of InAs nanowires. The conceivable merits of using Pb as the SC are: i) Pb has a larger superconducting gap, higher critical temperature, and higher parallel critical magnetic field than those of Al; ii) A superconducting gap comparable with those of InAs-Al and InSb-Al can be induced in PbTe-Pb even by a weak coupling between Pb and PbTe, which simultaneously relieves the adverse renormalization and induced disorder effects on SM from SC; iii) Pb film can be grown on PbTe with a thin buffer CdTe layer in between, solving the lattice mismatch problem as an important source of disorder. In the presence of a parallel magnetic field, we show that the typical BdG energy spectrum and tunneling spectroscopy of PbTe-Pb resemble those of InAs and InSb based hybrid nanowires exposed to a titling magnetic field, as a result of the highly anisotropic Landé g factors of PbTe nanowires. The calculated topological phase diagrams of PbTe-Pb indicate that the multivalley character of PbTe makes it easier than InAs and InSb to access topological superconducting phases. Our results could facilitate the experimental realization of PbTe-Pb hybrid nanowires and inspire further theoretical works.

show abstract

Parity-preserving and magnetic field–resilient superconductivity in InSb nanowires with Sn shells

Cited by 70 publications

References 52 publications

Full parity phase diagram of a proximitized nanowire island

Full parity phase diagram of a proximitized nanowire island

Growth of PbTe nanowires by molecular beam epitaxy

Numerical study of PbTe-Pb hybrid nanowires for engineering Majorana zero modes

Contact Info

Product

Resources

About