Article
Physics, Applied
Y. Sato, Z. Xiang, Y. Kasahara, S. Kasahara, L. Chen, C. Tinsman, F. Iga, J. Singleton, N. L. Nair, N. Maksimovic, J. G. Analytis, Lu Li, Y. Matsuda
Summary: Recent studies on Kondo insulators, such as YbB12, have shown that the transport properties exhibit insulating behavior at high temperatures and a plateau at low temperatures, with the plateau value decreasing with decreasing sample thickness. Additionally, weak-antilocalization effects were observed in the magnetoresistance of microstructures, indicating the presence of a topologically protected surface state. High-field resistivity measurements further support the occurrence of quantum oscillations in the insulating bulk of YbB12.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Areg Ghazaryan, Emilian M. Nica, Onur Erten, Pouyan Ghaemi
Summary: The study investigates the unique surface states of topological Kondo insulators (TKIs) that support surface states with arbitrarily large Fermi surfaces when the chemical potential is pinned to the Dirac point, leading to finite-frequency quantum oscillations. The researchers demonstrate the mechanism and significance of shadow surface states in tetragonal TKIs, providing an important example of high-frequency quantum oscillations beyond cubic TKIs.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Anuva Aishwarya, Zhuozhen Cai, Arjun Raghavan, Marisa Romanelli, Xiaoyu Wang, Xu Li, G. D. Gu, Mark Hirsbrunner, Taylor Hughes, Fei Liu, Lin Jiao, Vidya Madhavan
Summary: Incorporating relativistic physics into quantum tunneling can lead to exotic behavior such as perfect transmission through Klein tunneling. In this study, tunneling properties of spin-momentum-locked relativistic fermions were probed using nanowires made of the topological Kondo insulator candidate samarium hexaboride. The nanowires were attached to scanning tunneling microscope tips to image the bicollinear stripe spin order in the antiferromagnet Fe1.03Te with a Neel temperature of about 50 kelvin.
Article
Materials Science, Multidisciplinary
M. Carlone, J. C. Souza, J. Sichelschmidt, P. F. S. Rosa, R. R. Urbano, P. G. Pagliuso, Z. Fisk, P. A. Venegas, P. Schlottmann, C. Rettori
Summary: This study reports on the temperature dependence of electron spin resonance (ESR) of Gd3+-doped SmB6 single crystals. An anomalous inhomogeneous broadening of the Gd3+ ESR linewidth was observed within a certain temperature range, which is attributed to slow crystalline electric field fluctuations. The observed properties are related to the structure and charge fluctuations of SmB6, providing important insights into its physical properties.
Review
Quantum Science & Technology
Steffen Wirth, Pedro Schlottmann
Summary: Compounds within the hexaboride class of materials exhibit a wide variety of interesting physical phenomena, with SmB6 drawing attention as a prototypical topological Kondo insulator. Using scanning tunneling microscopy (STM) as a powerful tool to provide local, microscopic information related to the one-particle Green's function, progress has been made in investigating hexaborides, particularly SmB6, despite facing challenges.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Multidisciplinary Sciences
Yoshiyuki Ohtsubo, Toru Nakaya, Takuto Nakamura, Patrick Le Fevre, Francois Bertran, Fumitoshi Iga, Shin-Ichi Kimura
Summary: The breakdown of in-plane rotation symmetry in topological surface states (TSSs) of SmB6 is shown to be related to the importance of surface atomic structure. Experimentally, it is found that TSSs are anisotropic and lack the fourfold rotation symmetry observed in the bulk on the SmB6(001)-p(2 x 2) surface. These results suggest that engineering the surface atomic structure could provide a new pathway to tailor various properties of TSSs.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
W. K. Park, J. A. Sittler, L. H. Greene, W. T. Fuhrman, J. R. Chamorro, S. M. Koohpayeh, W. A. Phelan, T. M. McQueen
Summary: The study found that surface states in SmB6 are affected by defects, exhibiting different temperature evolutions from stoichiometric crystals, indicating a drastic change in their topological nature. The sensitivity to defects seems contradictory to topological protection, but it can be understood as being due to the intimate interplay between strong correlations and topological effects.
Article
Chemistry, Multidisciplinary
Yugui Cui, Yi Chu, Zhencun Pan, Yingjie Xing, Shaoyun Huang, Hongqi Xu
Summary: This study reports the observation of anisotropic magnetoresistance in a single SmB6 nanowire, showcasing high-symmetry crystal facets and immunity to magnetic dopant pollution. The cosine function behavior of the AMR provides evidence supporting the topologically non-trivial nature of the surface-states by rotation of the in-plane magnetic field.
Article
Materials Science, Multidisciplinary
Jolanta Stankiewicz, Pedro Schlottmann, Javier Blasco, Monica Ciomaga Hatnean, Geetha Balakrishnan
Summary: We conducted an impedance study on SmB6 single crystals in-plane and out-of-plane at low temperatures and a wide frequency range. The dielectric behavior of the system, ranging from surface to bulk dominated electrical conduction, was described by a universal equivalent circuit between 2 and 10 K. We identified the contributions of resistance, capacitance, and inductance to the impedance. The obtained equivalent inductance decreased significantly with increasing temperature, indicating the transition to bulk controlled electrical conduction. Self-sustained voltage oscillations below 6 K, observed when applying a dc current to small crystals, suggest a large self-capacitance of SmB6 likely due to surface states.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Daisuke Nakamura, Atsushi Miyake, Akihiko Ikeda, Masashi Tokunaga, Fumitoshi Iga, Yasuhiro H. Matsuda
Summary: In this study, the high-frequency magnetoresistance of Kondo semiconductor SmB6 under ultrahigh magnetic fields generated by the electromagnetic flux-compression technique was investigated. The semiconductor-metal transition due to closing of the hybridization charge gap was observed at approximately 180 T, with a critical magnetic field substantially higher than previous reports. Another transition was observed at a lower field (approximately 80 T) at temperatures below around 10 K, which may be related to the energy scale of quasiparticles such as the spin polaron in the in-gap state.
Article
Multidisciplinary Sciences
Shulin Wang, Chengzhi Qin, Lange Zhao, Han Ye, Stefano Longhi, Peixiang Lu, Bing Wang
Summary: This paper introduces a new class of reconfigurable linear optics circuits harnessing Floquet LZT, which has versatile applications in temporal beam control, signal processing, quantum simulations, and information processing.
Article
Materials Science, Multidisciplinary
Zhaotong Zhuang, Meng Lyu, Te Zhang, Xiaoci Zhang, Zhen Wang, Hengcan Zhao, Junsen Xiang, Yosikazu Isikawa, Shuai Zhang, Peijie Sun
Summary: Comparative study on single crystalline intermetallics CeInCu2 and NdInCu2 reveals similarities in their temperature-field phase diagrams, despite differences in thermal expansion and Gruneisen ratio that are more sensitive to Kondo hybridization. Both compounds exhibit ground-state magnetism derived from spin frustration and/or Kondo physics.
Article
Multidisciplinary Sciences
M. T. Greenaway, P. Kumaravadivel, J. Wengraf, L. A. Ponomarenko, A. Berdyugin, J. Li, J. H. Edgar, R. Krishna Kumar, A. K. Geim, L. Eaves
Summary: High-current oscillatory magnetoresistance measurements on graphene have revealed three non-equilibrium quantum phenomena, including Doppler-like shift and splitting of frequencies, intra-LL Mach effect, and the onset of elastic inter-LL transitions. These phenomena can be unified in a single resonance equation and offer avenues for research on out-of-equilibrium phenomena in other two-dimensional fermion systems.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Fatemeh Mohammadi, Amirhossein Saedpanah, Abolhassan Vaezi, Mehdi Kargarian
Summary: In this work, we study a superconducting Kondo lattice model to explore the interplay between electron correlations and conduction electrons. We obtain the phase diagram of the model and identify a topological order phase and a Kondo compensated phase. Numerical calculations show that the topological order is a stable phase.
Article
Materials Science, Multidisciplinary
Damian Tomaszewski, Piotr Busz, Jan Martinek
Summary: This paper provides a detailed theoretical description of the influence of spin accumulation in metallic Fermi leads on the Kondo effect in systems such as quantum dots and Kondo alloys. The study shows that the presence of spin accumulation, magnetic field, and ferromagnetic leads spin polarization can suppress the Kondo effect, but for appropriately selected parameter values, these effects can compensate each other and may lead to the restoration of the Kondo effect in the analyzed systems. The paper also discusses recent experiments related to spin current in Kondo alloys.
Article
Physics, Multidisciplinary
Po-Yao Chang, Onur Erten, Piers Coleman
Article
Physics, Multidisciplinary
Onur Erten, Po-Yao Chang, Piers Coleman, Alexei M. Tsvelik
PHYSICAL REVIEW LETTERS
(2017)
Article
Multidisciplinary Sciences
Rui Wang, Onur Erten, Baigeng Wang, D. Y. Xing
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Sooyoung Jang, Robert Kealhofer, Caolan John, Spencer Doyle, Ji-Sook Hong, Ji Hoon Shim, Q. Si, O. Erten, Jonathan D. Denlinger, James G. Analytis
Article
Multidisciplinary Sciences
Yasen Hou, Rui Wang, Rui Xiao, Luke McClintock, Henry Clark Travaglini, John Paulus Francia, Harry Fetsch, Onur Erten, Sergey Y. Savrasov, Baigeng Wang, Antonio Rossi, Inna Vishik, Eli Rotenberg, Dong Yu
NATURE COMMUNICATIONS
(2019)
Article
Chemistry, Multidisciplinary
Muhammad Akram, Harrison LaBollita, Dibyendu Dey, Jesse Kapeghian, Onur Erten, Antia S. Botana
Summary: We present a comprehensive theory of magnetic phases in twisted bilayer chromium trihalides, showing that a wide range of noncollinear magnetic phases can be stabilized as a function of twist angle and interactions. Our results provide an interpretation for recent observations of noncollinear magnetic phases in twisted bilayer CrI3 and demonstrate the possibility of engineering further nontrivial magnetic ground states in twisted bilayer chromium trihalides.
Review
Physics, Applied
M. Blei, J. L. Lado, Q. Song, D. Dey, O. Erten, V. Pardo, R. Comin, S. Tongay, A. S. Botana
Summary: The recent discovery of magnetism in monolayers of two-dimensional van der Waals materials has opened new possibilities in materials science and condensed matter physics. However, challenges still exist in this field, with many promising directions for future research and potential applications in sensing and data storage.
APPLIED PHYSICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Julia Wildeboer, Alexander Seidel, N. S. Srivatsa, Anne E. B. Nielsen, Onur Erten
Summary: We introduce a quantum dimer model on the kagome lattice with full translational invariance featuring a quantum many-body scar state. Through exact diagonalization, we demonstrate that nonscar states adhere to the eigenstate thermalization hypothesis by analyzing energy distribution, entanglement properties, and fidelity dynamics.
Article
Materials Science, Multidisciplinary
Muhammad Akram, Onur Erten
Summary: In this study, it is shown that magnetic skyrmions can be stabilized in twisted moire superlattices without an external magnetic field through the Dzyaloshinskii-Moriya interaction. The presence of a skyrmion crystal phase requires a matching of length scales between the moire periodicity and the skyrmions. Skyrmions in moire superlattices exhibit enhanced stability for the easy-axis anisotropy, making them potentially crucial for realizing skyrmions in van der Waals magnets with easy-axis anisotropy.
Article
Materials Science, Multidisciplinary
Emilian M. Nica, Onur Erten
Article
Materials Science, Multidisciplinary
Emilian M. Nica, Jyoti Krishna, Rong Yu, Qimiao Si, Antia S. Botana, Onur Erten
Article
Materials Science, Multidisciplinary
Emilian M. Nica, Onur Erten
Article
Materials Science, Multidisciplinary
Eoin Quinn, Onur Erten
Article
Materials Science, Multidisciplinary
Shadab Ahamed, Roderich Moessner, Onur Erten
Article
Materials Science, Multidisciplinary
Joonbum Park, Hideaki Sakai, Onur Erten, Andrew P. Mackenzie, Clifford W. Hicks
