# N. Peter Armitage

## Professor

Bloomberg 309

410-516-0621

npa@jhu.edu

Curriculum Vitae

Group/Lab Website

Google Scholar Profile

N. Peter Armitage has been at Johns Hopkins University since 2006. He received his B.S. in Physics from Rutgers University in 1994 and his Ph.D. from Stanford University in 2002. He is a physicist whose research centers on material systems which exhibit coherent quantum effects at low temperatures, like superconductors and "quantum" magnetism. Dr. Armitage's principal scientific interest is understanding how is it that large ensembles of strongly interacting, but fundamentally simple particles like electrons in solids act collectively to exhibit complex emergent quantum phenomena. He is exploiting (and developing) recent technical breakthroughs using very low frequency microwave and THz range radiation to probe these systems at their natural frequency scales. The material systems of interest require novel measurement techniques as their relevant frequencies typically fall between the range of usual optical and electronic methods.

He has been the recipient of a DARPA Young Faculty Award, an NSF Career Award, a Sloan Research Fellowship, was a three time Kavli Frontiers Fellow, the Spicer Award from the Stanford Synchrotron Radiation Laboratory, the McMillan Award from the University of Illinois and 2016 Genzel Prize. He was also the co-chair of the 2014 Gordon Research Conference in Correlated Electron Systems.

- Advance Condensed Matter Physics - Spring 2012
- Classical Mechanics 105 - Fall 2011
- Introduction to Condensed Matter Physics - Fall 2010
- Introduction to Condensed Matter Physics - Fall 2009
- Introduction to Condensed Matter Physics - Fall 2008
- The Advanced and Intermediate Lab - Spring 2008

Please also check out my perpetually updated lecture notes on "Electrodynamics of correlated electron systems".

These are based on lectures I first gave at the "2008 Boulder School for Condensed Matter and Materials Physics."

See the videos of these lectures here: Formalism and Techniques and Examples and Advanced Analysis

Displaying the 20 most recent publications. View the Google Scholar Profile for complete publications list.

Note: Please refresh the page if no publications initially appear.

NJ Laurita, CM Morris, SM Koohpayeh, WA Phelan, TM McQueen, ...

Impurities or a neutral Fermi surface? A further examination of the low-energy ac optical conductivity of SmB6

**Physica B: Condensed Matter, 2017 **

X Zhang, F Mahmood, M Daum, Z Dun, JAM Paddison, NJ Laurita, ...

Hierarchy of exchange interactions in the triangular-lattice spin-liquid YbMgGaO $ _ {4} $

**arXiv preprint arXiv:1708.07503, 2017 **

Y Wang, I Tamir, D Shahar, NP Armitage

A Bose metal has no cyclotron resonance

**arXiv preprint arXiv:1708.01908, 2017 **

NJ Laurita, Y Luo, R Hu, M Wu, SW Cheong, O Tchernyshyov, ...

Anomalous exchange interactions between RE $^{+ 3} $ and Mn $^{+ 3} $ moments in multiferroic h-REMnO $ _3$

**arXiv preprint arXiv:1706.04141, 2017 **

NP Armitage, EJ Mele, A Vishwanath

Weyl and Dirac Semimetals in Three Dimensional Solids

**arXiv preprint arXiv:1705.01111, 2017 **

NJ Laurita, GG Marcus, BA Trump, J Kindervater, MB Stone, TM McQueen, ...

Low energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator Cu $ _2 $ OSeO $ _3$

**arXiv preprint arXiv:1704.04228, 2017 **

RM Ireland, L Wu, M Salehi, S Oh, NP Armitage, HE Katz

Nonvolatile Solid-State Charged-Polymer Gating of Topological Insulators into the Topological Insulating Regime

**arXiv preprint arXiv:1704.01021, 2017 **

A Farid, NJ Laurita, B Tehrani, JG Hester, MM Tentzeris, NP Armitage

Inkjet Printed Wire-Grid Polarizers for the THz Frequency Range

**Journal of Infrared, Millimeter, and Terahertz Waves 38 (3), 276-282, 2017 **

D Chaudhuri, B Cheng, A Yaresko, QD Gibson, RJ Cava, NP Armitage

An optical investigation of the strong spin-orbital coupled magnetic semimetal YbMnBi $ _2$

**arXiv preprint arXiv:1701.08693, 2017 **

L Wu, M Salehi, N Koirala, J Moon, S Oh, NP Armitage

Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulator

**Science 354 (6316), 1124-1127, 2016 **

NP Armitage

Kitaev's exact solution approximated

**arXiv preprint arXiv:1611.09991, 2016 **

L Zhao, CA Belvin, R Liang, DA Bonn, WN Hardy, NP Armitage, D Hsieh

A global inversion-symmetry-broken phase inside the pseudogap region of YBa $ _2 $ Cu $ _3 $ O $ _y$

**arXiv preprint arXiv:1611.08603, 2016 **

B Cheng, L Wu, SK Kushwaha, RJ Cava, NP Armitage

Measurement of the topological surface state optical conductance in bulk-insulating Sn-doped Bi 1.1 Sb 0.9 Te 2 S single crystals

**Physical Review B 94 (20), 201117, 2016 **

NJ Laurita, CM Morris, SM Koohpayeh, PFS Rosa, WA Phelan, Z Fisk, ...

Anomalous three-dimensional bulk ac conduction within the Kondo gap of SmB 6 single crystals

**Physical Review B 94 (16), 165154, 2016 **

M Brahlek, N Koirala, M Salehi, J Moon, W Zhang, H Li, X Zhou, MG Han, ...

Disorder-driven topological phase transition in B i 2 S e 3 films

**Physical Review B 94 (16), 165104, 2016 **

A Akrap, M Hakl, S Tchoumakov, I Crassee, J Kuba, MO Goerbig, ...

Magneto-Optical Signature of Massless Kane Electrons in Cd 3 As 2

**Physical review letters 117 (13), 136401, 2016 **

NJ Laurita, B Cheng, R Barkhouser, VA Neumann, NP Armitage

A Modified 8f Geometry with Reduced Optical Aberrations for Improved Time Domain Terahertz Spectroscopy

**Journal of Infrared, Millimeter, and Terahertz Waves 37 (9), 894-902, 2016 **

L Wu, RM Ireland, M Salehi, B Cheng, N Koirala, S Oh, HE Katz, ...

Tuning and stabilizing topological insulator Bi2Se3 in the intrinsic regime by charge extraction with organic overlayers

**Applied Physics Letters 108 (22), 221603, 2016 **

B Cheng, L Wu, NJ Laurita, H Singh, M Chand, P Raychaudhuri, ...

Anomalous gap-edge dissipation in disordered superconductors on the brink of localization

**Physical Review B 93 (18), 180511, 2016 **

M Neshat, NP Armitage

Terahertz time-domain spectroscopic ellipsometry system

**US Patent 9,322,712, 2016 **