Condensed Matter and Quantum Circuits

It is possible to construct a microchip whose electronic behavior differs qualitatively from its constituent pieces. New particles and phases of matter can emerge, such as fractionalized electrons that are neither fermions nor bosons, and quantum-critical metals that defy long-held beliefs on the nature of conductivity. We build such chips from effectively low-dimensional materials, pattern them with nano-lithography, and measure them at ultralow temperatures.  In many ways, although the basic laws describing these systems are well known and immutable, it is as though an entirely new physical reality arises once such a chip is constructed.

Currently, the group is interested in using electromechanical and microwave measurement techniques to study quantities that are “invisible” to conventional electrical transport experiments. On the electromechanics side, ultra-high-Q mechanical oscillators are being built to study dynamics and quantum coherence in insulating phases of matter. On the microwave side, wide-band and low noise receiver chains are being constructed to perform fundamental studies on the electrical properties of superconductor-semiconductor heterostructures, which harbor poorly understood superconducting, metallic, and — possibly — topological phases.

Andrew P. Higginbotham
Universitetsparken 5, HCØ 3, Room 108
2100 Copenhagen Ø

Tel: +45 50 20 46 94
Skype: andrew.p.higginbotham

Andrew Higginbotham will join IST Austria in March 2019.

»CV and publication list

»Research group website

Alexandra Mally

Phone: +43 2243 9000-1105

Selected Publications

  • A.P. Higginbotham,* P.S. Burns,* M.D. Urmey,* R.W. Peterson, N.S. Kampel, B.M. Brubaker, G.C. Smith, K.W. Lehnert, C.A. Regal. Electro-optic correlations improve an efficient, microwave-mechanical-optical converter. Nature Physics, doi:10.1038/s41567-018-0210-0 (2018).
  • S.M. Albrecht,* A.P. Higginbotham,* M. Madsen, F. Kuemmeth, T. S. Jespersen, J. Nygård, P. Krogstrup, C.M. Marcus, Exponential protection of zero modes in Majorana islands, Nature 531, 206–209 (2016).
  • A.P. Higginbotham,* S.M. Albrecht,* G. Kiršanskas, W. Chang, F. Kuemmeth, P. Krogstrup, T.S. Jespersen, J. Nygård, K. Flensberg, C.M. Marcus, Parity lifetime of bound states in a proximitized semiconductor nanowire, Nature Physics 11, 1017–1021 (2015).
  • A.P. Higginbotham, F. Kuemmeth, T.W. Larsen, M. Fitzpatrick, J. Yao, H. Yan, C.M. Lieber, C.M. Marcus, Antilocalization of Coulomb Blockade in a Ge/Si Nanowire, Phys. Rev. Lett. 112, 216806 (2014).
  • A. P. Higginbotham, F. Kuemmeth, M. P. Hanson, A. C. Gossard, C. M. Marcus, Coherent Operations and Screening in Multielectron Spin Qubits. Phys. Rev. Lett. 112, 026801 (2014).

As of 2019 Assistant Professor, IST Austria
2017-2019 Researcher, Microsoft Station Q Copenhagen
2015-2017 Postdoctoral research, JILA: NIST and CU Boulder
2010-2015 Ph.D., Harvard University
2009-2010 M.Phil., Cambridge University
2005-2009 B.Sc., Harvey Mudd College

Selected Distinctions
2016 National Research Council Postdoctoral Fellowship
2010 D.O.E. Office of Science Graduate Fellowship
2009 A.P.S. Apker Award Finalist
2009 Churchill Foundation Scholarship, Cambridge, UK

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