Carbon Kagome Nanotubes -- quasi-one-dimensional nanostructures with flat bands

• URL: http://arxiv.org/abs/2301.10200v3
• Date: Thu, 14 Dec 2023 16:56:11 GMT
• Title: Carbon Kagome Nanotubes -- quasi-one-dimensional nanostructures with flat bands
• Authors: Hsuan Ming Yu, Shivam Sharma, Shivang Agarwal, Olivia Liebman and Amartya S. Banerjee
• Abstract summary: We introduce carbon Kagome nanotubes -- a new allotrope of carbon formed by rolling up sheets of Kagome graphene. Ab initio molecular dynamics simulations indicate that both types of CKNTs are likely to exist as stable structures at room temperature.
• Score: 9.634821776480532
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce carbon Kagome nanotubes (CKNTs) -- a new allotrope of carbon formed by rolling up sheets of Kagome graphene, and investigate the properties of this material using first principles calculations. Based on the direction of rolling, we identify two principal varieties of CKNTs -- armchair and zigzag, and find that the bending stiffness associated with rolling Kagome graphene into either type of CKNT is about a third of that associated with rolling conventional graphene into carbon nanotubes (CNTs). Ab initio molecular dynamics simulations indicate that both types of CKNTs are likely to exist as stable structures at room temperature. Each CKNT explored here is metallic and features dispersionless states (i.e., flat bands) throughout its Brillouin zone, along with an associated singular peak in the electronic density of states, close to the Fermi level. We calculate the mechanical and electronic response of CKNTs to torsional and axial strains and compare against conventional CNTs. We show in particular, that upon twisting, degenerate dispersionless electronic states in CKNTs split, Dirac points and partially flat bands emerge from the quadratic band crossing point at the Fermi level, and that these features can be explained using a relatively simple tight-binding model. Overall, CKNTs appear to be unique and striking examples of realistic elemental quasi-one-dimensional (1D) materials that can potentially display fascinating collective material properties arising from the presence of strongly correlated electrons. Additionally, distorted CKNTs may provide an interesting material platform where flat band physics and chirality induced anomalous transport effects may be studied together.

Related papers

• Emergence of moiré superlattice potential in graphene by twisted-hBN layers [8.46876904184933]
  We present a novel approach to realize an atomically flat substrate with a periodic moir'e pattern. By constructing a twisted hBN (thBN) moir'e substrate at an angle of about 1$circ$, we show that the graphene on top, aligned around 15$circ$ with the neighboring hBN layers, exhibits typical transport properties. All features point to the existence of the moir'e potential in graphene formed by thBN with $sim$1$circ$ twist angle.
  arXiv  Detail & Related papers  (2024-05-16T13:22:04Z)
• Thermopower in hBN/graphene/hBN superlattices [46.287853697580566]
  We experimentally study thermopower in high-quality monolayer graphene within heterostructures consisting of complete hBN encapsulation and 1D edge contacts. We show that the temperature dependence of the thermopower enables the assessment of the role of built-in strain variation and van Hove singularities. We show the same superlattice device can exhibit a temperature-driven thermopower reversal from positive to negative and vice versa, by controlling the carrier density.
  arXiv  Detail & Related papers  (2023-06-14T19:06:34Z)
• Engineering flat bands in twisted-bilayer graphene away from the magic angle with chiral optical cavities [0.0]
  We show that by employing chiral optical cavities, the topological flat bands can be stabilized away from the magic angle. Time reversal symmetry breaking plays a fundamental role in flattening the isolated bands and gapping out the rest of the spectrum. Our results demonstrate the possibility of engineering flat bands in TBG using optical devices.
  arXiv  Detail & Related papers  (2023-06-08T12:17:44Z)
• Higher-order topological Peierls insulator in a two-dimensional atom-cavity system [58.720142291102135]
  We show how photon-mediated interactions give rise to a plaquette-ordered bond pattern in the atomic ground state. The pattern opens a non-trivial topological gap in 2D, resulting in a higher-order topological phase hosting corner states. Our work shows how atomic quantum simulators can be harnessed to investigate novel strongly-correlated topological phenomena.
  arXiv  Detail & Related papers  (2023-05-05T10:25:14Z)
• Review on coherent quantum emitters in hexagonal boron nitride [91.3755431537592]
  I discuss the state-of-the-art of defect centers in hexagonal boron nitride with a focus on optically coherent defect centers. The spectral transition linewidth remains unusually narrow even at room temperature. The field is put into a broad perspective with impact on quantum technology such as quantum optics, quantum photonics as well as spin optomechanics.
  arXiv  Detail & Related papers  (2022-01-31T12:49:43Z)
• Entangled two-plasmon generation in carbon nanotubes and graphene coated wires [0.0]
  We investigate the two-plasmon spontaneous decay of a quantum emitter near single-walled carbon nanotubes (SWCNT) and graphene-coated wires (GCWs) We predict two-plasmon emission rates more than twelve orders of magnitude higher than in free-space. Given their low dimensionality, these systems could be more efficient for generating and detecting entangled plasmons in comparison to extended graphene.
  arXiv  Detail & Related papers  (2022-01-19T23:29:23Z)
• TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
  Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
  arXiv  Detail & Related papers  (2021-08-30T22:22:47Z)
• Tunable bandgaps and flat bands in twisted bilayer biphenylene carbon [1.0934800950965333]
  twisted bilayer biphenylene carbon (BPC) is a promising material for the application of terahertz and infrared photodetectors. The flat bands in twisted BPC are no longer restricted by "magic angles", i.e., abnormal flat bands could be appeared as well as several specific large angles in addition to the small angles.
  arXiv  Detail & Related papers  (2021-08-17T02:29:17Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions [57.50861918173065]
  Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
  arXiv  Detail & Related papers  (2020-05-03T09:27:31Z)
• Emergence of Topologically Non-trivial Spin-polarized States in a Segmented Linear Chain [5.971462788192772]
  Van der Waals-bonded segmented linear chain transition metal chalcogenide materials could open up new opportunities in low-dimensional, gate-tunable, magnetic and topological crystalline systems.
  arXiv  Detail & Related papers  (2020-01-18T00:35:33Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.