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Single-electron charge transfer into putative Majorana and trivial modes in individual vortices

Ge, Jian Feng (author), Bastiaans, K.M. (author), Chatzopoulos, Damianos (author), Cho, Doohee (author), Tromp, Willem O. (author), Benschop, Tjerk (author), Niu, Jiasen (author), Gu, Genda (author), Allan, Milan P. (author)

Majorana bound states are putative collective excitations in solids that exhibit the self-conjugate property of Majorana fermions—they are their own antiparticles. In iron-based superconductors, zero-energy states in vortices have been reported as potential Majorana bound states, but the evidence remains controversial. Here, we use scanning...

journal article 2023

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Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor FeTe_0.55Se_0.45

Chatzopoulos, Damianos (author), Cho, Doohee (author), Bastiaans, Koen M. (author), Steffensen, Gorm O. (author), Bouwmeester, D. (author), Akbari, Alireza (author), Gu, Genda (author), Paaske, Jens (author), Andersen, Brian M. (author), Allan, Milan P. (author)

By using scanning tunneling microscopy (STM) we find and characterize dispersive, energy-symmetric in-gap states in the iron-based superconductor FeTe_0.55Se_0.45, a material that exhibits signatures of topological superconductivity, and Majorana bound states at vortex cores or at impurity locations. We use a...

journal article 2021

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Fabrication of on-chip probes for double-tip scanning tunneling microscopy

Leeuwenhoek, M. (author), Groenewoud, Freek (author), van Oosten, Kees (author), Benschop, Tjerk (author), Allan, Milan P. (author), Groeblacher, S. (author)

A reduction of the interprobe distance in multiprobe and double-tip scanning tunneling microscopy to the nanometer scale has been a longstanding and technically difficult challenge. Recent multiprobe systems have allowed for significant progress by achieving distances of ~30 nm using two individually driven, traditional metal wire tips. For...

journal article 2020

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Modeling Green's function measurements with two-tip scanning tunneling microscopy

Leeuwenhoek, M. (author), Groeblacher, S. (author), Allan, Milan P. (author), Blanter, Y.M. (author)

A double-tip scanning tunneling microscope with nanometer-scale tip separation has the ability to access the single-electron Green's function in real and momentum spaces based on second-order tunneling processes. Experimental realization of such measurements has been limited to quasi-one-dimensional systems due to the extremely small signal...

journal article 2020

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Nanofabricated tips for device-based scanning tunneling microscopy

Leeuwenhoek, M. (author), Norte, R.A. (author), Bastiaans, Koen M. (author), Cho, Doohee (author), Battisti, Irene (author), Blanter, Y.M. (author), Groeblacher, S. (author), Allan, Milan P. (author)

We report on the fabrication and performance of a new kind of tip for scanning tunneling microscopy. By fully incorporating a metallic tip on a silicon chip using modern micromachining and nanofabrication techniques, we realize so-called smart tips and show the possibility of device-based STM tips. Contrary to conventional etched metal wire...

journal article 2019

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Imaging doubled shot noise in a Josephson scanning tunneling microscope

Bastiaans, K. M. (author), Cho, D. (author), Chatzopoulos, D. (author), Leeuwenhoek, M. (author), Koks, C. (author), Allan, M. P. (author)

We have imaged the current noise with atomic resolution in a Josephson scanning tunneling microscope with a Pb-Pb junction. By measuring the current noise as a function of applied bias, we reveal the change from single-electron tunneling above the superconducting gap energy to double-electron charge transfer below the gap energy when Andreev...

journal article 2019

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Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots

Geiregat, P.A. (author), Houtepen, A.J. (author), Sagar, Laxmi Kishore (author), Infante, Ivan (author), Zapata, Felipe (author), Grigel, Valeriia (author), Allan, Guy (author), Delerue, Christophe (author), Van Thourhout, Dries (author), Hens, Zeger (author)

Colloidal quantum dots (QDs) raise more and more interest as solution-processable and tunable optical gain materials. However, especially for infrared active QDs, optical gain remains inefficient. Since stimulated emission involves multifold degenerate band-edge states, population inversion can be attained only at high pump power and must...

journal article 2018

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Chemical composition and hygroscopic properties of aerosol particles over the Aegean Sea

Bezantakos, S. (author), Barmpounis, K. (author), Giamarelou, M. (author), Bossioli, E. (author), Tombrou, M. (author), Mihalopoulos, N. (author), Eleftheriadis, K. (author), Kalogiros, J. (author), Allan, J.D. (author), Bacak, A. (author), Percival, C.J. (author), Coe, H. (author), Biskos, G. (author)

The chemical composition and water uptake characteristics of sub-micrometre atmospheric particles over the region of the Aegean Sea were measured between 25 August and 11 September 2011 within the framework of the Aegean-Game campaign. High temporal-resolution measurements of the chemical composition of the particles were conducted using an...

journal article 2013

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The Impact of Regulations on West Coats Towing Vessel Safety

Allan, Robert G. (author)

journal article 2005

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Escort tug design alternatives and a comparison of their hydrodynamic performance

Allan, Robert G. (author)

journal article 2004

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The evolution of escort tug technology, fulfilling a promise

Allan, Robert G. (author)

journal article 2000

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Oceans from Space – A textbook for Offshore Engineers and Naval Architects

Aage, Christiaan (author), Allan, T.D. (author), Carter, D.J.T. (author), Lindgren, G. (author), Olagnon, M. (author)

book 1998

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Application and advantages of catamarans for coastal patrol vessels

Allan, Robert G. (author)

journal article 1996

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The planning, Design and Construction of Fast Response Fireboats for the Port of Vancouver

Pamplin, Donald J. (author), Hatfield, Peter S. (author), Allan, Robert G. (author)

journal article 1995

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High speed water jets from vertically accelerated rotating cones

Savic, P. (author), Allan, J.D. (author), van Blokland, G.P. (author)

Water jets are produced by vertically accelerating a rotating cone partially filled with water. It is shown that the acceleration of the parabolic meniscus results in a motion similar to that observed in a shaped explosive charge. (Monroe jet). Acceleration of the cone is effected by means of an inductive electromagnetic accelerating device ...

report 1972

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Kinematic rectification in damped single-axis gyros

Allan, R.R. (author)

In a single-axis gyro a rotation about the input axis forces the spin axis to rotate about the output axis. The true input axis is oscillating about its nominal position and the gyro sees a varying component of the angular velocity about the nominal spin axis. This may be rectified, thereby causing a drift, if the components of angular velocity...

report 1962

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Satellite orbit perturbations due to radiation pressure and luni-solar forces

Allan, R.R. (author)

The perturbations are, calculated by a vector method, exact to first order in the perturbing force, and retaining all long-period and secular terms. The effect of the earth's shadow is investigated for radiation pressure. The gravity gradient force is given as an expansion in the ratio of the major axis, of the satellite orbit to the distance...

report 1962

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Ship trial performance and the model prediction

Allan, James F. (author), Canham, H.J.S. (author)

report 1954

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Some results of scale effect experiments on a twin-screw hull series

Allan, James F. (author)

report 1950

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Research on design of drifters

Allan, James F. (author)

report 1950