Selected by year

Z. Yang, J. Yi, F. Li, Z. Li, L. Ye, B. Li, and J. Christensen
“Static mechanical cloaking and camouflage from disorder”
Accepted to Nature Communications (2025).

Y.-F. Xia, Z.-X. Xu, Y.-T. Yan, A. Chen, J. Yang, B. Liang, J.-C. Cheng, and J. Christensen
“Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point”
Physical Review Letters 135, 067001 (2025). [pdf]

W. Xiong, T. Zhang, Z. Zhang, Y. Zhu, S. Wang, H. Zhang, Y. Cheng, X. Liu, and J. Christensen
“Experimental Observation of 𝑘-Dependent Bulk-Edge Correspondence in Sonic Semimetals with High Winding Numbers”
Physical Review Letters 135, 036602 (2025). [pdf]

Y. Hu, Y. Li, B. Li, and J. Christensen
“Giant elastic-wave asymmetry in a linear passive circulator”
Nature Communications 16, 3991 (2025). [pdf]

Y. Zhang, L.-Y. Zheng, and J. Christensen
“Defect-immune sound radiation in a topologically nontrivial hyperbolic metamaterial”
Physical Review Letters 134, 156602 (2025). [pdf]

J. Zhang, J. Liu, A. Souslov, M. T. Pérez Prado, J. Segurado, M. Haranczyk, and J. Christensen
“Buckle-barrel correspondence based on topological polarization conversion in mechanical metamaterials”
Advanced Materials 37, 2415962 (2025). [pdf]
Cover story [👌]

B. Hu, Z. Zhang, Y. Liu, D. Liao, Y. Zhu, H. Zhang, Y. Cheng, X. Liu, and J. Christensen
“Engineering higher-order topological confinement via acoustic non-Hermitian textures”
Advanced Materials 36, 2406567 (2024). [pdf]

D. Liao, J. Zhang, S. Wang, Z. Zhang, A. Cortijo, M. A. H. Vozmediano, F. Guinea, Y. Cheng, X. Liu, and J. Christensen
“Visualizing the topological pentagon states of a giant C₅₄₀ metamaterial”
Nature Communications 15, 9644 (2024). [pdf]

L. Zhang, Y. Ge , Y.-J. Guan, F. Chen, N. Han, Q. Chen, Y. Pan, D. Jia, S-Q. Yuan , H.-X. Sun, J. Christensen, H. Chen, and Y. Yang
“Nonreciprocal acoustic devices with asymmetric Peierls phases”
Physical Review Letters 133, 136601 (2024).[pdf]

J. Zheng , L. Zheng , S. Yu , S. Yang , L. Liu , X. Sun, Y.-F. Chen, M.-H. Lu, and J. Christensen
“Focusing micromechanical polaritons in topologically nontrivial hyperbolic metasurfaces”
Advanced Materials 36, 2311599 (2024). [pdf]
Cover story [👌]

H.-X. Li, J.-J. Liu, Z.-X. Chen, K. Wu, B. Liang, J.-C. Cheng, and J. Christensen
“Superwavelength Self-Healing of Spoof Surface Sonic Airy-Talbot Waves”
Nature Communications 14, 7633 (2023). [pdf]

B. Hu, Z. Zhang, Z. Yue, D. Liao, Y. Liu, H. Zhang, Y. Cheng, X. Liu, and J. Christensen
“Anti-parity-time symmetry in a Su-Schrieffer-Heeger sonic lattice”
Physical Review Letters 131, 066601 (2023). [pdf]
Editors’ suggestion, Cover story [👌]

X. Zhang, F. Zangeneh-Nejad, Z.-G. Chen, M.-H. Lu, and J. Christensen
“A Second Wave of Topological Phenomena in Photonics and Acoustics”
Nature 618, 687 (2023). [pdf]

R. Pernas, L. Zheng, Z. Zhang, P. Gao, X. Liu, C. Ying, and Johan Christensen
“Theory of non-Hermitian topological whispering gallery”
NPJ Computational Materials 8, 241 (2022). [pdf]

Z. Zhang, P. Gao, W. Liu, Z. Yue, Y. Cheng, X. Liu, and J. Christensen
“Structured sonic tube with carbon nanotube-like topological edge states”
Nature Communications 13, 5096 (2022). [pdf]

Y. Jia, Y. Liu, B. Hu, W. Xiong, Y. Bai, Y. Cheng, D. Wu, X. Liu, and J. Christensen
“Orbital angular momentum multiplexing in space-time thermoacoustic metasurfaces”
Advanced Materials 34, 2202026 (2022). [pdf]
Cover story [👌]

J. Liu, Z. Li, Y. Ding, A. Chen, B. Liang, J. Yang, J.-C. Cheng, and J. Christensen
“Twisting linear to orbital angular momentum in an ultrasonic motor”
Advanced Materials 34, 2201575 (2022). [pdf]
Cover story [👌]

L. Zheng and J. Christensen
“Dirac hierarchy in acoustic topological insulators”
Physical Review Letters 127, 156401 (2021). [pdf]

B. Hu, Z. Zhang, H. Zhang, L. Zheng, W. Xiong, Z. Yue, X. Wang, J. Xu, Y. Cheng, X. Liu, and J. Christensen
“Non-Hermitian topological whispering gallery”
Nature 597, 655 (2021). [pdf]

C. Liu, W. Zhao, J. Shi, X. Zhou, C. Ma, R. Peng, M. Wang, Z. H. Hang, J. Christensen, N. X. Fang, and Y. Lai
“A three-dimensional soundproof acoustic metacage”
Physical Review Letters 127, 084301 (2021). [pdf]
Editors’ suggestion.

J. Zhang, W. Rui, C. Ma, Y. Cheng, X. Liu, and J. Christensen
“Remote Whispering Metamaterial: Non-radiative transceiving of ultra-weak sound”
Nature Communications 12, 3670 (2021). [pdf]

P. Gao and J. Christensen
“Topological vortices for sound and light”
Nature Nanotechnology 16, 487 (2021). [pdf]

L. Zheng, X. Zhang, M.-H. Lu, Y.-F. Chen, and J. Christensen
“Knitting topological bands in artificial sonic semimetals”
Materials Today Physics 16, 100299 (2021). [pdf]

M. Rosendo-Lopez, F. Peñaranda, J. Christensen, and P. San-Jose
“Flat bands in magic-angle vibrating plates”
Physical Review Letters 125, 214301 (2020). [pdf]

P. Gao, M. Willatzen, and J. Christensen
“Anomalous topological edge states in non-Hermitian piezophononic media”
Physical Review Letters 125, 206402 (2020). [pdf]

M. Willatzen, P. Gao, J. Christensen, and Z. L. Wang
“Acoustic gain in solids due to piezoelectricity, flexoelectricity, and electrostriction”
Advanced Functional Materials 30, 2003503 (2020). [pdf]

P. Gao, D. Torrent, F. Cervera, P. San-Jose, J. Sanchez-Dehesa, and J. Christensen
“Majorana-like zero modes in Kekulé distorted sonic lattices”
Physical Review Letters 123, 196601 (2019). [pdf]
Cover story [👌]

C.-W. Chen, N. Lera, R. Chaunsali, D. Torrent, J. V. Alvarez, J. Yang, P. San-Jose, and J. Christensen
“Mechanical analogue of a Majorana bound state”
Advanced Materials 31, 1904386 (2019). [pdf]

M. Rosendo-Lopez, Z. Zhang, D. Torrent, and J. Christensen
“Multiple scattering theory of non-Hermitian sonic second-order topological insulators”
Communications Physics 2, 132 (2019). [pdf]

Z. Zhang, H. Long, C. Liu, C. Shao, Y. Cheng, X. Liu, and J. Christensen
“Deep-subwavelength holey acoustic second-order topological insualators”
Advanced Materials 31, 1904682 (2019). [pdf]
Cover story [👌]

Z. Zhang, M. Rosendo Lopez, Y. Cheng, X. Liu, and J. Christensen
“Non-Hermitian sonic second-order topological insulator”
Physical Review Letters 122, 195501 (2019). [pdf]

X. Zhang, M. Xiao, Y. Cheng, M.-H. Lu, and J. Christensen
“Topological Sound”
Communications Physics 1, 97 (2018). [pdf]

A. Merkel, V. Romero-Garcia, J.-P. Groby, J. Li, and J. Christensen
“Unidirectional zero sonic reflection in passive PT-symmetric Willis media”
Physical Review B (Rapid Communication) 98, 201102 (2018). [pdf]

Z. Zhang, Y. Tian, Y. Wang, S. Gao, Y. Cheng, X. Liu, and J. Christensen
“Directional acoustic antennas based on valley-Hall topological insulators”
Advanced Materials 30, 1803229 (2018). [pdf]

M. Wang, L. Ye, J. Christensen, and Z. Liu
“Valley Physics in non-Hermitian artificial Acoustic Boron Nitride”
Physical Review Letters 120, 246601 (2018). [pdf]

Z. Zhang, Y. Tian, Y. Cheng, X. Liu, and J. Christensen
“Experimental verification of acoustic pseudospin multipoles in a symmetry-broken snowflakelike topological insulator”
Physical Review B (Rapid Communication) 96, 241306 (2017). [pdf]
A figure of this article has been chosen as a PRB Kaleidoscope [image].

K. Bertoldi, V. Vitelli, J. Christensen, and M. van Hecke
“Flexible mechanical metamaterials”
Nature Reviews Materials 2, 17066 (2017). [pdf]
Cover story [👌]

G. Ma, C. Fu, G. Wang, P. del Hougne, J. Christensen, Y. Lai and P. Sheng
“Polarization Bandgaps and Fluid-like Elasticity in Fully Solid Elastic Metamaterials”
Nature Communications 7, 13536 (2016). [pdf]

J. Christensen. M. Willatzen. V. R. Velasco and M.-H. Lu
“Parity-time synthetic phononic media”
Physical Review Letters 116, 207601 (2016). [pdf]

S. A. Cummer, J. Christensen and A. Alu
“Controlling sound with acoustic metamaterials”
Nature Reviews Materials 1, 16001 (2016). [pdf]
Selected by the editor to be free during the APS March Meeting 2018.

V.M. Garcia-Chocano, J. Christensen and J. Sánchez-Dehesa
“Negative refraction and energy funneling by hyperbolic materials: An experimental demonstration in acoustics”
Physical Review Letters 112, 144301 (2014). [pdf]

M. Willatzen, and J. Christensen
“Acoustic gain in piezoelectric semiconductors at ɛ-near-zero response”
Physical Review B (Rapid Communication) 89, 041201 (2014). [pdf]

J. Christensen, Z. Liang, and M. Willatzen
“Metadevices for the confinement of sound and broadband double-negativity behavior”
Physical Review B (Rapid Communication) 88, 100301 (2013). [pdf]
A figure of this article has been chosen as a PRB Kaleidoscope [image].

J. Christensen and F. J. Garcia de Abajo
“Anisotropic metamaterials for full control of acoustic waves”
Physical Review Letters 108, 124301 (2012). [pdf]

J. Zhu*, J. Christensen*, J. Jung, L. Martin-Moreno, X. Yin, L. Fok, F. J. Garcia-Vidal and Xiang Zhang
“A Holey structured metamaterial for acoustic deep subwavelength imaging”
Nature Physics 7, 52 (2011). [pdf] *These authors contributed equally.

J. Christensen and F. J. Garcia de Abajo
“Slow plasmonic slab waveguide as a superlens for visible light”
Physical Review B (Rapid Communication) 82, 161103 (2010). [pdf]

J. Christensen, Martin-Moreno and F. J. Garcia-Vidal,
“Theory of resonant acoustic transmission through subwavelength apertures”
Physical Review Letters 101, 014301 (2008). [pdf]

J. Christensen, A.I. Fernandez-Dominguez, F. de Leon-Perez, L. Martin-Moreno and F. J. Garcia-Vidal
“Collimation of sound assisted by acoustic surface waves”
Nature Physics 3, 851 (2007). [pdf]
Among the research highlights in Nature 450, 4 (2007). [pdf]