115 citations · 515 across the 18 of their papers we have counts for
19 papers
Direct observation of phonon mode with an antisymmetric Raman tensor
Shangfei Wu, Shang Ren, Kai Du +4
Phonon angular momentum, characterized by circular or elliptical motion of atoms, plays a decisive role in diverse phenomena, ranging from the phonon Hall effect, phonon magnetic m…
Electrotoroidicity: New Paradigm for Transverse Electromagnetic Responses
Kai Du, Daegeun Jo, Xianghan Xu +7
The exploration of transverse electromagnetic responses in solids with broken spatial-inversion (I) and/or time-reversal (T) symmetries has unveiled numerous captivating phenomena,…
Inducing topological flat bands in bilayer graphene with electric and magnetic superlattices
Daniel Seleznev, Jennifer Cano, David Vanderbilt
It was recently argued that Bernal stacked bilayer graphene (BLG) exposed to a 2D superlattice (SL) potential exhibits a variety of intriguing behaviors [Ghorashi et al., Phys. Rev…
Magnetochiral Tunneling in Paramagnetic CoNbS
Seongjoon Lim, Sobhit Singh, Fei-Ting Huang +6
Electric currents have the intriguing ability to induce magnetization in nonmagnetic crystals with sufficiently low crystallographic symmetry. Some associated phenomena include the…
Adiabatic dynamics of coupled spins and phonons in magnetic insulators
Shang Ren, John Bonini, Massimiliano Stengel +2
In conventional \textit{ab initio} methodologies, phonons are calculated by solving equations of motion involving static interatomic force constants and atomic masses. The Born-Opp…
Cyclic Ferroelectric Switching and Quantized Charge Transport in CuInPS
Daniel Seleznev, Sobhit Singh, John Bonini +2
The van der Waals layered ferroelectric CuInPS has been found to exhibit a variety of intriguing properties arising from the fact that the Cu ions are unusually mobile in t…
Spin-phonon interactions and magnetoelectric coupling in CoO ( = Nb, Ta)
K. Park, J. Kim, S. Choi +10
In order to explore the consequences of spin-orbit coupling on spin-phonon interactions in a set of chemically-similar mixed metal oxides, we measured the infrared vibrational prop…
Magnetic phase crossover in strongly correlated EuMn2P2
Tanya Berry, Nicodemos Varnava, Dominic Ryan +12
Strong electron correlations underlie a plethora of electronic and magnetic components and devices and are often used to identify and probe novel ground states in quantum materials…
Frequency splitting of chiral phonons from broken time reversal symmetry in CrI
John Bonini, Shang Ren, David Vanderbilt +3
Conventional approaches for lattice dynamics based on static interatomic forces do not fully account for the effects of time-reversal-symmetry breaking in magnetic systems. Recent…
Electronic structure of Humble defects in Ge and GeSi
Shang Ren, Hongbin Yang, Sobhit Singh +3
The group-IV diamond-structure elements are known to host a variety of planar defects, including {001} planar defects in C and {001}, {111} and {113} planar defects in Si and Ge. A…
Dipolar Magnetic Interactions and A-type Antiferromagnetic Order in the Zintl Phase Insulator EuZn2P2
Tanya Berry, Veronica J. Stewart, Benjamin W. Y. Redemann +4
Zintl phases, containing strongly covalently bonded frameworks with separate ionically bonded ions, have emerged as a critical materials family in which to couple magnetism and str…
Nonreciprocal directional dichroism at telecom wavelengths
K. Park, M. O. Yokosuk, M. Goryca +7
Magnetoelectrics with ultra-low symmetry and spin-orbit coupling are well known to display a number of remarkable properties including nonreciprocal directional dichroism. As a pol…
Vibrational properties of CuInP2S6 across the ferroelectric transition
Sabine N. Neal, Sobhit Singh, Xiaochen Fang +6
In order to explore the properties of a two-sublattice ferroelectric, we measured the infrared and Raman scattering response of CuInP2S6 across the ferroelectric and glassy transit…
Vibrational fingerprints of ferroelectric hafnia
Shiyu Fan, Sobhit Singh, Xianghan Xu +6
Hafnia (HfO2) is a promising material for emerging chip applications due to its high-k dielectric behaviour, suitability for negative capacitance heterostructures, scalable ferroel…
Humble planar defects in SiGe nanopillars
Hongbin Yang, Shang Ren, Sobhit Singh +5
We report a new \{001\} planar defect found in SiGe nanopillars. The defect structure, determined by atomic resolution electron microscopy, matches the Humble defect model proposed…
Polarization selectivity of aloof-beam electron energy-loss spectroscopy in one-dimensional ZnO nanorods
Yao-Wen Yeh, Sobhit Singh, David Vanderbilt +1
Orientation dependent electronic properties of wurtzite zinc oxide nanorods are characterized by aloof beam electron energy-loss spectroscopy (EELS) carried out in a scanning trans…
Successive magnetic field-induced transitions and colossal magnetoelectric effect in NiTeO
Jae Wook Kim, S. Artyukhin, E. D. Mun +8
We report the discovery of a metamagnetic phase transition in a polar antiferromagnet NiTeO that occurs at 52 T. The new phase transition accompanies a colossal magnetoelec…
Dimerization-Induced Cross-Layer Quasi-Two-Dimensionality in Metallic Iridate IrTe2
G. L. Pascut, K. Haule, M. J. Gutmann +7
The crystal structure of layered metal IrTe2 is determined using single-crystal x-ray diffraction. At T=220 K, it exhibits Ir and Te dimers forming a valence-bond crystal. Electron…
Electromechanical behavior of BaTiO3 from first principles
Alberto Garcia, David Vanderbilt
Using an effective Hamiltonian parametrized from first principles, Monte Carlo simulations are performed in order to study the piezoelectric response of BaTiO3 in the ferroelectric…