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Articles by Lujin Min
Gate-induced layer sliding drives non-volatile switching of magnetism in tetralayer graphene
Abstract Layer stacking in two-dimensional materials can strongly impact electronic phases. In graphene, for instance, the metastable rhombohedral stacking arrangement hosts correlated and topological electronic phases, which are absent in conventional Bernal stacking. Here we use the sliding-induced first-order structural phase transition between Bernal and rhombohedral tetralayer graphene driven by gate voltages to manipulate the magnetic phase of the sample.
Colossal room-temperature non-reciprocal Hall effect - Nature Materials
Abstract Non-reciprocal charge transport has gained significant attention due to its potential in exploring quantum symmetry and its promising applications. Traditionally, non-reciprocal transport has been observed in the longitudinal direction, with non-reciprocal resistance being a small fraction of the ohmic resistance.
High-entropy engineering of the crystal and electronic structures in a Dirac material - Nature Communications
Abstract Dirac and Weyl semimetals are a central topic of contemporary condensed matter physics, and the discovery of new compounds with Dirac/Weyl electronic states is crucial to the advancement of topological materials and quantum technologies. Here we show a widely applicable strategy that uses high configuration entropy to engineer relativistic electronic states.
Hidden non-collinear spin-order induced topological surface states - Nature Communications
Abstract Rare-earth monopnictides are a family of materials simultaneously displaying complex magnetism, strong electronic correlation, and topological band structure. The recently discovered emergent arc-like surface states in these materials have been attributed to the multi-wave-vector antiferromagnetic order, yet the direct experimental evidence has been elusive.
Structure and lattice excitations of the copper substituted lead oxyapatite ${\mathrm{Pb}}_{9.06(7)}{\mathrm{Cu}}_{0.94(6)}{({\mathrm{PO}}_{3.92(4)})}_{6}{\mathrm{O}}_{0.96(3)}$
The copper substituted lead oxyapatite, Pb10−xCux(PO3.92(4))6O0.96(3) [x = 0.94(6)] was studied using neutron and x-ray diffraction and neutron spectroscopy techniques. The crystal structure of the main phase of our sample, which has come to be colloquially known as LK-99, is verified to possess a hexagonal structure with space group P63/m, alongside the presence of impurity phases Cu and Cu2S.
Large anomalous Hall effect and negative magnetoresistance in half-topological semimetals - Communications Physics
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Abstract Proposed mechanisms for large intrinsic anomalous Hall effect (AHE) in magnetic topological semimetals include diverging Berry curvatures of Weyl nodes, anticrossing nodal rings or points of non-trivial bands.
By Yanglin Zhu, David Graf Verified, Seng Huat Lee, John Singleton, Lujin Min, Johanna Palmström, Arun Bansil, Bahadur Singh
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Nature
Verified
Strong electron-phonon coupling driven pseudogap modulation and density-wave fluctuations in a correlated polar metal - Nature Communications
Abstract There is tremendous interest in employing collective excitations of the lattice, spin, charge, and orbitals to tune strongly correlated electronic phenomena. We report such an effect in a ruthenate, Ca3Ru2O7, where two phonons with strong electron-phonon coupling modulate the electronic pseudogap as well as mediate charge and spin density wave fluctuations.
Possible evidence of Weyl fermion enhanced thermal conductivity under magnetic fields in the antiferromagnetic topological insulator $\mathrm{Mn}{({\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x})}_{2}{\mathrm{Te}}_{4}$
Abstract We report thermal conductivity and Seebeck effect measurements on Mn(Bi1−xSbx)2Te4 (MBST) with x=0.26 under applied magnetic fields below 50K. Our data shows clear indications of the electronic structure transition induced by the antiferromagnetic (AFM) to ferromagnetic (FM) transition driven by applied magnetic field as well as significant positive magnetothermal conductivity in the Weyl semimetal state of MBST.
Strong room-temperature bulk nonlinear Hall effect in a spin-valley locked Dirac material - Nature Communications
Abstract Nonlinear Hall effect (NLHE) is a new type of Hall effect with wide application prospects. Practical device applications require strong NLHE at room temperature (RT). However, previously reported NLHEs are all low-temperature phenomena except for the surface NLHE of TaIrTe4. Bulk RT NLHE is highly desired due to its ability to generate large photocurrent. Here, we show the spin-valley locked Dirac state in BaMnSb2 can generate a strong bulk NLHE at RT.
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