- Aug 16, 2017
- Active Faculty
Jerry Cowen Chair of Experimental Physics and Assistant Professor
Condensed Matter Physics - Experimental
Biomedical-Physical Sciences Bldg.
567 Wilson Rd., Room 4216
Laboratory for Hybrid Quantum Systems:
B116 Biomedical-Physical Sciences Bldg.
Research webpage: www.hybridquantumlab.com
Flip-chip gate-tunable acoustoelectric effect in graphene, J.R. Lane, L. Zhang, M.A. Khasawneh, B.N. Zhou, E.A. Henriksen and J. Pollanen, J. Appl. Phys. 124, 194302 (2018)
Unconventional field-effect transistor composed of electrons floating on liquid helium, K. Nasyedkin, H. Byeon, L. Zhang, N.R. Beysengulov, J. Milem, S. Hemmerle, R. Loloee and J. Pollanen, J. Phys.: Condens. Matter 30, 465501 (2018)
Charge metastability and hysteresis in the quantum Hall regime, J. Pollanen, J.P. Eisenstein, L.N. Pfeiffer, and K.W. West, Phys. Rev B 94, 245440 (2016).
Heterostructure Symmetry and the Orientation of the Quantum Hall Nematic Phases, J. Pollanen, K.B. Cooper, S. Brandsen, J.P. Eisenstein, L.N. Pfeiffer, and K.W. West, Phys. Rev B 92, 115410 (2015).
The Superfluid Glass Phase of 3He-A, J.I.A. Li, J. Pollanen, A.M. Zimmerman, C.A. Collett, W.J. Gannon, and W.P. Halperin, Nature Physics 9, 775 (2013).
New Chiral Phases of Superfluid 3He Stabilized by Anisotropic Silica Aerogel, J. Pollanen, J.I.A. Li, C.A. Collett, W.J. Gannon, W.P. Halperin, and J.A. Sauls, Nature Physics 8, 317 (2012).
Nanoparticle-loaded Aerogels and Layered Aerogels Cast from Sol-gel Mixtures, J. Kim, H. Nakanishi, J. Pollanen, S. Smoukov, W.P. Halperin, and B.A. Grzybowski, Small 7, 2542 (2011).
Professional Activities & Interests / Biographical Information
In our experimental research group at MSU, the Laboratory for Hybrid Quantum Systems (LHQS), we are exploring the fundamental physics and potential quantum information (QI) applications of low-dimensional electron systems (electrons on helium, graphene, and semiconductor 2d systems) and superconducting circuit based quantum bits (qubits). Additionally, we are interested in creating hybrid quantum system by bringing together materials or devices with a variety of interacting degrees of freedom.
Low temperatures (< 10mK) and high magnetic fields (up to 14T) are required to produce the exotic quantum properties that we investigate and our devices and samples are prepared using modern nanofabrication techniques available in the Keck Facility at MSU. We use a diverse set of experimental techniques, including high field magneto-transport and advanced microwave and surface acoustic wave techniques, to interrogate these fascinating quantum materials and reveal their properties.
Before joining the Physics and Astronomy faculty at Michigan State University, Johannes was an IQIM postdoctoral scholar at the Institute for Quantum Information and Matter (IQIM) at the California Institute of Technology working with Prof. Jim Eisenstein. At Caltech, he studied the exotic properties and many-body quantum states of single and bilayer 2d electron systems in ultra-clean semiconductor heterostructures grown via molecular beam epitaxy (MBE). Recently, Johannes and collaborators demonstrated a method for controlling the orientation of a class of 2d electronic liquid crystals known as the quantum Hall nematics and a highlight of the work can be found here.
Johannes earned his Ph.D. in 2012 from Northwestern University where he worked with Prof. Bill Halperin in the Low Temperature Physics Group to understand the properties of complex many-particle quantum systems and engineer novel quantum mechanical forms of matter. During this time, Johannes discovered a new chiral state of superfluid 3He, which he stabilized by introducing anisotropic disorder to the superfluid in the form of high porosity silica aerogel.