Henriksen Lab
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2021

Fabrication and surface treatment of electron-beam evaporated niobium for low-loss coplanar waveguide resonators
D. Kowsari, K. Zheng, J. Monroe, N. Thobaben, X. Du, P. Harrington, E. A. Henriksen, D. Wisbey, and K. Murch, to appear in Applied Physics Letters.

Axion Dark Matter eXperiment: Run 1B Analysis Details
ADMX Collaboration, Phys. Rev. D 103, 032002 (2021); also on arXiv.

2020

Axion Dark Matter eXperiment: Detailed Design and Operations
ADMX Collaboration submitted to Rev. Sci. Inst., available at arXiv.

Modulation Doping via a Two-Dimensional Atomic Crystalline Acceptor
Y. Wang, J. Balgley, E. Gerber, M. Gray, N. Kumar, X. Lu, J.-Q. Yan, A. Fereidouni, R. Basnet, S. J. Yun, D. Suri, K. Hikari, T. Taniguchi, K. Watanabe, X. Ling, J. Moodera, Y. H. Lee, H. O. H. Churchill, J. Hu, L. Yang, E.-A. Kim, D. G. Mandrus, E. A. Henriksen, K. S. Burch, Nano Letters (2020), also on arXiv.
We discover that a single layer of the transition metal trihalide α-RuCl3 can be used to cleanly and controllably introduce charge carriers into graphene (as well as other materials including EuS and WSe2). The high mobility of the graphene can be maintained at very high charge carrier densities; and the charge transfer can even take place across few-nm-thick insulating layers of hexagonal boron nitride!

Broken symmetries and Kohn's theorem in graphene cyclotron resonance
Jordan Pack, B. Jordan Russell, Yashika Kapoor, Jesse Balgley, Jeff Ahlers, T. Taniguchi, K. Watanabe, and E. A. Henriksen. Physical Review X, 10, 041006 (2020); also on arXiv.
Full lifting of the four-fold symmetry of graphene Landau levels is seen in the magnetoplasmon spectrum via infrared cyclotron resonance. The evolution of the cyclotron resonance, from one to four and back to two peaks, can be clearly followed as the Landau level filling factor is varied, showing in close detail just how the gaps open up near integer filling factors!

Extraordinary magnetoresistance in encapsulated monolayer graphene devices
Bowen Zhou, T. Taniguchi, K. Watanabe, and E. A. Henriksen. Applied Physics Letters 116, 053102 (2020); also on arXiv.
Encapsulated graphene devices with a central metallic shunt show a remarkable "extraordinary magnetoresistance effect," with nearly 6 orders of magnitude increase in the resistance.

Unexpected hole doping of graphene by osmium adatoms
J. A. Elias and E. A. Henriksen, Annalen der Physik 532, 1900294, (2020); also on arXiv.
A submonolayer coating of osmium adatoms on monolayer graphene results in p-type doping of the graphene, contrary to theoretical expectations and to all other metallic adatoms on graphene studied to date.

Electronic transport properties of a lithium-decorated ZrTe5 thin film
W. Yu, J. A. Elias, K.-W. Chen, R. Baumbach, T. M. Nenoff, N. A. Modine, W. Pan, & E. A. Henriksen, Scientific Reports 10, 3537 (2020).

An Extended Search for the Invisible Axion with the Axion Dark Matter Experiment
T. Braine et al. Phys. Rev. Lett. 124, 101303 (2020); also on arXiv.

Crystal structure reconstruction in the surface monolayer of the quantum spin liquid candidate α-RuCl3
Z. Dai, J.-X. Yu, B. Zhou, S. Tenney, P. Lampen-Kelley, J. Q. Yan, D. Mandrus, E. A. Henriksen, J. Zang, K. Pohl, & J. T. Sadowski, 2D Materials 7, 035004 (2020).
Low-energy diffraction studies from the surface of of the anti-ferromagnetic Mott insulator α-RuCl3 shows an inversion-symmetry-breaking in the surface layer, possibly due to Cl vacancies.

2019

Optically driven magnetic phase transition of monolayer α-RuCl3
Y. Tan, W. Gao, E. A. Henriksen, J. R. Chelikowsky, & L. Yang, Nano Letters 19, 7673 (2019); also on arXiv.
Optical doping of a monolayer of the anti-ferromagnetic Mott insulator α-RuCl3 is predicted to drive a transition to a ferromagnetic state.

Evidence for charge transfer and proximate magnetism in graphene/α-RuCl3 heterostructures
B. Zhou, J. Balgley, P. Lampen-Kelly, J.-Q. Yan, D. G. Mandrus, and E. A. Henriksen, Phys. Rev. B 100, 165426 (2019); also on arXiv.
A Mott insulator (and quantum spin liquid candidate!) experiences significant charge transfer when in contact with graphene, and we observe a magnetic proximity effect in the graphene resistivity.

Possible structural transformation and enhanced magnetic fluctuations in exfoliated α-RuCl3
Boyi Zhou, Yiping Wang, Gavin B. Osterhoudt, Paige Kelley, David Mandrus, Rui He, Kenneth S. Burch, and E. A. Henriksen. J. Phys. Chem. Sol. 128, 291 (2019); also on arXiv.
The layered transition metal trihalide α-RuCl3, a candidate to host the Kitaev quantum spin liquid, is exfoliated down to few- and mono-layer samples for the first time, revealing a structural distortion of the thinnest layers.

2018

Digital atomic scale fabrication an inverse Moore's Law - A path to atomically precise manufacturing
John N. Randall, James H. G. Owen, Ehud Fuchs, Joseph Lake, James R. Von Ehr, Josh Ballard, and Erik A. Henriksen, Micro and Nano Engineering 1, 1 (2018).
Opinion piece proposing the development of a digital approach to device fabrication.

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. App. Phys. 124, 194302 (2018); also on arXiv.
The first demonstration of surface acoustic wave measurements of gate-tunable graphene.

Many-particle effects in the cyclotron resonance of encapsulated monolayer graphene
B. Jordan Russell, Boyi Zhou, T. Taniguchi, K. Watanabe, and E. A. Henriksen, Phys. Rev. Lett. 120, 047401 (2018); also on arXiv.
Precision infrared magneto-spectroscopy of high mobility graphene reveals subtle variations due to correlated electron behavior.

2017

Electronic transport and scattering times in tungsten-decorated graphene
J. A. Elias and E. A. Henriksen, Phys. Rev. B 95, 075405 (2017); also on arXiv.
By depositing a dilute coating of W atoms on graphene we seek to induce a spin-orbit coupling; surprisingly, none is found!

2015

Transport in indium-decorated graphene
U. Chandni, E. A. Henriksen and J. P. Eisenstein, Phys. Rev. B 91, 245402 (2015); also on arXiv.
By depositing a dilute coating of In atoms on graphene we seek to induce a spin-orbit coupling; surprisingly, none is found!

2012

Quantum Hall effect and semimetallic behavior in dual-gated ABA trilayer graphene
E. A. Henriksen, D. Nandi and J. P. Eisenstein, Phys. Rev. X. 2, 011004 (2012); also on arXiv.
(with Commentary): Mirror-symmetry-breaking of gated ABA-trilayer graphene is discovered via measurements of the quantum Hall effect.

2010

Measurement of the electronic compressibility of bilayer graphene
E. A. Henriksen and J. P. Eisenstein, Phys. Rev. B 82, 041412(R) (2010); also on arXiv.
A gap in the band structure of bilayer graphene is seen by measurements of the density of states.

Interaction-induced shift of the cyclotron resonance of graphene using infrared spectroscopy
E. A. Henriksen, P. Cadden-Zimansky, Z. Jiang, Z. Q. Li, L.-C. Tung, M. E. Schwartz, M. Takita, Y.-J. Wang, P. Kim and H. L. Stormer, Phys. Rev. Lett. 104, 067404 (2010); also on arXiv.
A gap opening in the N=0 Landau level of graphene is ascribed to electron interactions.

2009

Optical phonon mixing in bilayer graphene with a broken inversion symmetry
J. Yan, T. Villarson, E. A. Henriksen, P. Kim and A. Pinczuk, Phys. Rev. B 80, 241417(R) (2009); retrieve from PRB.

Band structure asymmetry of bilayer graphene revealed by infrared spectroscopy
Z. Q. Li, E. A. Henriksen, Z. Jiang, Z. Hao, M. C. Martin, P. Kim, H. L. Stormer and D. N. Basov, Phys. Rev. Lett. 102, 037403 (2009); also on arXiv.

2008

Observation of anomalous phonon softening in bilayer graphene
J. Yan, E. A. Henriksen, P. Kim and A. Pinczuk, Phys. Rev. Lett. 101, 136804 (2008), also on arXiv.

Dirac charge dynamics in graphene by infrared spectroscopy
Z. Li, E. A. Henriksen, Z. Jiang, Z. Hao, M. C. Martin, P. Kim, H. L. Stormer and D. N. Basov, Nature Phys. 4, 532 (2008); also on arXiv.

2007

Cyclotron resonance in bilayer graphene
E. A. Henriksen, Z. Jiang, L. C. Tung, M. E. Schwartz, M. Takita, Y.-J. Wang, P. Kim and H. L. Stormer, Phys. Rev. Lett. 100, 087403 (2007), also on arXiv.

Infrared spectroscopy of Landau levels in graphene
Z. Jiang, E. A. Henriksen, L. C. Tung, Y.-J. Wang, M. E. Schwartz, M. Y. Han, P. Kim and H. L. Stormer, Phys. Rev. Lett. 98, 197403 (2007); also on arXiv.

2006

Disorder-mediated splitting of the cyclotron resonance line of two-dimensional electron systems
E. A. Henriksen, S. Syed, Y.-J. Wang, H. L. Stormer, L. N. Pfeiffer and K. W. West, Phys. Rev. B 73, 241309(R) (2006), also on arXiv.

Splitting of the cyclotron resonance in two-dimensional electron systems
E. A. Henriksen, S. Syed, Y.-J. Wang, M. J. Manfra, L. N. Pfeiffer, K. W. West and H. L. Stormer, Physica E 34, 318 (2006).

2005

Acoustic phonon scattering in a low density, high mobility AlGaN/GaN field effect transistor
E. A. Henriksen, S. Syed, Y. Ahmadian, M. J. Manfra, K. W. Baldwin, A. M. Sergent, R. J. Molnar and H. L. Stormer, Appl. Phys. Lett. 86, 252108 (2005); also on arXiv.

2000

Quantized thermal conductance: measurements in nanostructures
K. Schwab, W. Fon, E. Henriksen, J. M. Worlock and M. L. Roukes, Physica B 280, 458 (2000).

Measurement of the quantum of thermal conductance
K. C. Schwab, E. A. Henriksen, J. M. Worlock and M. L. Roukes, Nature 404, 974-977 (2000); retrieve from Nature.
First observation of the quantum of thermal conductance; see commentary in the News & Views.