Observation of Distinct Superconducting Phases in Hyperdoped p-type Germanium

• URL: http://arxiv.org/abs/2008.06067v1
• Date: Thu, 13 Aug 2020 18:06:40 GMT
• Title: Observation of Distinct Superconducting Phases in Hyperdoped p-type Germanium
• Authors: Kasra Sardashti, Tri D. Nguyen, Wendy L. Sarney, Asher C. Leff, Mehdi Hatefipour, Matthieu C. Dartiailh, Joseph Yuan, William Mayer, Javad Shabani
• Abstract summary: We report systematic synthesis and characterization of superconducting phases in hyperdoped Germanium. Surprisingly, we find a nano-crystalline phase with quasi-2D characteristics consisting of a thin Ga film constrained near top surfaces. Our results suggest the possibility of integration of hyperdoped Ge nano-crystalline phase into superconducting circuits due to its 2D nature.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Realization of superconductivity in Group IV semiconductors could have a strong impact in the direction quantum technologies will take in the future. Therefore, it is imperative to understand the nature of the superconducting phases in materials such as Silicon and Germanium. Here, we report systematic synthesis and characterization of superconducting phases in hyperdoped Germanium prepared by Gallium ion implantation beyond its solubility limits. The resulting structural and physical characteristics have been tailored by changing the implantation energy and activation annealing temperature. Surprisingly, in addition to the poly-crystalline phase with weakly-coupled superconducting Ga clusters we find a nano-crystalline phase with quasi-2D characteristics consisting of a thin Ga film constrained near top surfaces. The new phase shows signatures of strong disorder such as anomalous B${\rm c}$ temperature dependence and crossings in magentoresistance isotherms. Apart from using hyperdoped Ge as a potential test-bed for studying signatures of quantum phase transitions (e.g. quantum Griffith singularity), our results suggest the possibility of integration of hyperdoped Ge nano-crystalline phase into superconducting circuits due to its 2D nature.

Related papers

• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Evidence of P-wave Pairing in K2Cr3As3 Superconductors from Phase-sensitive Measurement [26.69408771617283]
  We fabricate superconducting quantum interference devices (SQUIDs) on exfoliated K2Cr3As3. We observe that SQUIDs exhibit a pronounced second-order harmonic component sin(2phi) in the current-phase relation. We conclude that the existence of the pi-phase is in favor of the p-wave pairing symmetry in K2Cr3As3.
  arXiv  Detail & Related papers  (2024-08-14T07:34:45Z)
• Superfluid stiffness of twisted multilayer graphene superconductors [1.374933941124824]
  We report the measurement of $rho_s$ in magic-angle twisted trilayer graphene (TTG) We find a linear temperature dependence of $rho_s$ at low temperatures and nonlinear Meissner effects in the current bias dependence. Our results provide strong evidence for nodal superconductivity in TTG and put strong constraints on the mechanisms of these graphene-based superconductors.
  arXiv  Detail & Related papers  (2024-06-19T18:00:04Z)
• Superconductivity in a Topological Lattice Model with Strong Repulsion [1.1305119700024195]
  We introduce a minimal 2D lattice model that incorporates time-reversal symmetry, band topology, and strong repulsive interactions. We demonstrate that it is formed from the weak pairing of holes atop the QSH insulator. Motivated by this, we elucidate structural similarities and differences between our model and those of TBG in its chiral limit.
  arXiv  Detail & Related papers  (2023-08-21T18:00:01Z)
• Higher-order topological Peierls insulator in a two-dimensional atom-cavity system [58.720142291102135]
  We show how photon-mediated interactions give rise to a plaquette-ordered bond pattern in the atomic ground state. The pattern opens a non-trivial topological gap in 2D, resulting in a higher-order topological phase hosting corner states. Our work shows how atomic quantum simulators can be harnessed to investigate novel strongly-correlated topological phenomena.
  arXiv  Detail & Related papers  (2023-05-05T10:25:14Z)
• Anisotropic superconductivity of niobium based on its response to non-magnetic disorder [0.0]
  Niobium is one of the most studied superconductors, both theoretically and experimentally. In addition to power applications in alloys, pure niobium is used for sensitive magneto-sensing, radio-frequency cavities, and, more recently, as circuit metallization layers in superconducting qubits.
  arXiv  Detail & Related papers  (2022-07-28T22:24:27Z)
• Experimentally revealing anomalously large dipoles in a quantum-circuit dielectric [50.591267188664666]
  Two-level systems (TLSs) intrinsic to glasses induce decoherence in many modern quantum devices. We show the existence of two distinct ensembles of TLSs, interacting weakly and strongly with phonons. Results may shed new light on the low temperature characteristics of amorphous solids.
  arXiv  Detail & Related papers  (2021-10-20T19:42:22Z)
• Engineering the Radiative Dynamics of Thermalized Excitons with Metal Interfaces [58.720142291102135]
  We analyze the emission properties of excitons in TMDCs near planar metal interfaces. We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude. nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
  arXiv  Detail & Related papers  (2021-10-11T19:40:24Z)
• TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
  Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
  arXiv  Detail & Related papers  (2021-08-30T22:22:47Z)
• Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
  tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
  arXiv  Detail & Related papers  (2020-11-29T09:57:50Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.