keyword
https://read.qxmd.com/read/37748479/electrical-thermal-and-thermoelectric-transport-in-open-long-range-kitaev-chain
#21
JOURNAL ARTICLE
Averi Banerjee, Syeda Rafisa Rahaman, Nilanjan Bondyopadhaya
We study electrical, thermal and thermoelectric transport in a hybrid device consisting of a long-range Kitaev chain coupled to two metallic leads at two ends. Electrical and thermal currents are calculated in this device under both voltage and thermal bias conditions. We find that the transport characteristics of the long-range Kitaev chain are distinguishably different from its short-range counterpart, which is well known for hosting zero energy Majorana edge modes under some specific range of values of the model parameters...
September 25, 2023: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/37686996/thermophase-seebeck-coefficient-in-hybridized-superconductor-quantum-dot-superconductor-josephson-junction-side-coupled-to-majorana-nanowire
#22
JOURNAL ARTICLE
Yumei Gao, Xiaoyan Zhang, Zichuan Yi, Liming Liu, Feng Chi
The dc Josephson current is generated from phase difference between two superconductors separated by a mesoscopic thin film (Josephson junction) without external bias voltage. In the presence of a temperature gradient across the superconductors, a thermal phase is induced under the condition of open circuit. This is very similar to the Seebeck effect in the usual thermoelectric effect, and the thermal phase is thus named as thermophase Seebeck coefficient (TPSC). Here we find obvious enhancement and sign change of the TPSC unique to the Josephson junction composing of two superconductors connected to a semiconductor quantum dot (QD), which is additionally side-coupled to a nanowire hosting Majorana bound states (MBSs), the system denoted by S-MQD-S...
September 4, 2023: Nanomaterials
https://read.qxmd.com/read/37630878/majorana-excitons-in-a-kitaev-chain-of-semiconductor-quantum-dots-in-a-nanowire
#23
JOURNAL ARTICLE
Mahan Mohseni, Hassan Allami, Daniel Miravet, David J Gayowsky, Marek Korkusinski, Pawel Hawrylak
We present here a theory of Majorana excitons, photo-excited conduction electron-valence band hole pairs, interacting with Majorana Fermions in a Kitaev chain of semiconductor quantum dots embedded in a nanowire. Using analytical tools and exact diagonalization methods, we identify the presence of Majorana zero modes in the nanowire absorption spectra.
August 9, 2023: Nanomaterials
https://read.qxmd.com/read/37625066/coherent-error-threshold-for-surface-codes-from-majorana-delocalization
#24
JOURNAL ARTICLE
Florian Venn, Jan Behrends, Benjamin Béri
Statistical mechanics mappings provide key insights on quantum error correction. However, existing mappings assume incoherent noise, thus ignoring coherent errors due to, e.g., spurious gate rotations. We map the surface code with coherent errors, taken as X or Z rotations (replacing bit or phase flips), to a two-dimensional (2D) Ising model with complex couplings, and further to a 2D Majorana scattering network. Our mappings reveal both commonalities and qualitative differences in correcting coherent and incoherent errors...
August 11, 2023: Physical Review Letters
https://read.qxmd.com/read/37380690/magnetic-field-sensitive-charge-density-waves-in-the-superconductor-ute-2
#25
JOURNAL ARTICLE
Anuva Aishwarya, Julian May-Mann, Arjun Raghavan, Laimei Nie, Marisa Romanelli, Sheng Ran, Shanta R Saha, Johnpierre Paglione, Nicholas P Butch, Eduardo Fradkin, Vidya Madhavan
The intense interest in triplet superconductivity partly stems from theoretical predictions of exotic excitations such as non-Abelian Majorana modes, chiral supercurrents and half-quantum vortices1-4 . However, fundamentally new and unexpected states may emerge when triplet superconductivity appears in a strongly correlated system. Here we use scanning tunnelling microscopy to reveal an unusual charge-density-wave (CDW) order in the heavy-fermion triplet superconductor UTe2 (refs. 5-8 ). Our high-resolution maps reveal a multi-component incommensurate CDW whose intensity gets weaker with increasing field, with the CDW eventually disappearing at the superconducting critical field Hc2 ...
June 2023: Nature
https://read.qxmd.com/read/37347870/hunting-for-majoranas
#26
REVIEW
Ali Yazdani, Felix von Oppen, Bertrand I Halperin, Amir Yacoby
Over the past decade, there have been considerable efforts to observe non-abelian quasiparticles in novel quantum materials and devices. These efforts are motivated by the goals of demonstrating quantum statistics of quasiparticles beyond those of fermions and bosons and of establishing the underlying science for the creation of topologically protected quantum bits. In this Review, we focus on efforts to create topological superconducting phases that host Majorana zero modes. We consider the lessons learned from existing experimental efforts, which are motivating both improvements to present platforms and the exploration of new approaches...
June 23, 2023: Science
https://read.qxmd.com/read/37286552/single-electron-charge-transfer-into-putative-majorana-and-trivial-modes-in-individual-vortices
#27
JOURNAL ARTICLE
Jian-Feng Ge, Koen M Bastiaans, Damianos Chatzopoulos, Doohee Cho, Willem O Tromp, Tjerk Benschop, Jiasen Niu, Genda Gu, Milan P Allan
Majorana bound states are putative collective excitations in solids that exhibit the self-conjugate property of Majorana fermions-they are their own antiparticles. In iron-based superconductors, zero-energy states in vortices have been reported as potential Majorana bound states, but the evidence remains controversial. Here, we use scanning tunneling noise spectroscopy to study the tunneling process into vortex bound states in the conventional superconductor NbSe2 , and in the putative Majorana platform FeTe0...
June 8, 2023: Nature Communications
https://read.qxmd.com/read/37221184/chiral-superconductivity-in-ute-2-probed-by-anisotropic-low-energy-excitations
#28
JOURNAL ARTICLE
Kota Ishihara, Masaki Roppongi, Masayuki Kobayashi, Kumpei Imamura, Yuta Mizukami, Hironori Sakai, Petr Opletal, Yoshifumi Tokiwa, Yoshinori Haga, Kenichiro Hashimoto, Takasada Shibauchi
Chiral spin-triplet superconductivity is a topologically nontrivial pairing state with broken time-reversal symmetry, which can host Majorana quasiparticles. The heavy-fermion superconductor UTe2 exhibits peculiar properties of spin-triplet pairing, and the possible chiral state has been actively discussed. However, the symmetry and nodal structure of its order parameter in the bulk, which determine the Majorana surface states, remains controversial. Here we focus on the number and positions of superconducting gap nodes in the ground state of UTe2 ...
May 23, 2023: Nature Communications
https://read.qxmd.com/read/37115878/z_-2-spin-liquids-in-the-higher-spin-s-kitaev-honeycomb-model-an-exact-deconfined-z_-2-gauge-structure-in-a-nonintegrable-model
#29
JOURNAL ARTICLE
Han Ma
The higher spin Kitaev model prominently features the extensive locally conserved quantities the same as the spin-1/2 Kitaev honeycomb model, although it is not exactly solvable. It remains an open question regarding the physical meaning of these conserved quantities in the higher spin model. In this Letter, by introducing a Majorana parton construction for a general spin-S we uncover that these conserved quantities are exactly the Z_{2} gauge fluxes in the general spin-S model, including the case of spin-1/2...
April 14, 2023: Physical Review Letters
https://read.qxmd.com/read/37115867/superconductor-vortex-spectrum-including-fermi-arc-states-in-time-reversal-symmetric-weyl-semimetals
#30
JOURNAL ARTICLE
Rauf Giwa, Pavan Hosur
Using semiclassics to surmount the hurdle of bulk-surface inseparability, we derive the superconductor vortex spectrum in nonmagnetic Weyl semimetals and show that it stems from the Berry phase of orbits made of Fermi arcs on opposite surfaces and bulk chiral modes. Tilting the vortex transmutes it between bosonic, fermionic, and supersymmetric, produces periodic peaks in the density of states that signify novel nonlocal Majorana modes, and yields a thickness-independent spectrum at magic "magic angles." We propose (Nb,Ta)P as candidate materials and tunneling spectroscopy as the ideal experiment...
April 14, 2023: Physical Review Letters
https://read.qxmd.com/read/37085488/observing-and-braiding-topological-majorana-modes-on-programmable-quantum-simulators
#31
JOURNAL ARTICLE
Nikhil Harle, Oles Shtanko, Ramis Movassagh
Electrons are indivisible elementary particles, yet paradoxically a collection of them can act as a fraction of a single electron, exhibiting exotic and useful properties. One such collective excitation, known as a topological Majorana mode, is naturally stable against perturbations, such as unwanted local noise, and can thereby robustly store quantum information. As such, Majorana modes serve as the basic primitive of topological quantum computing, providing resilience to errors. However, their demonstration on quantum hardware has remained elusive...
April 21, 2023: Nature Communications
https://read.qxmd.com/read/36838990/observations-of-nematicity-dopants-and-zero-bias-conductance-peaks-for-the-ca-0-9-la-0-1-feas-2-superconductor
#32
JOURNAL ARTICLE
Jae-Joon Kim, Min Seok Park, Kyoung Seok Lee, Sang Hyun Joo, Jung Hoon Yoo, Dilip Bhoi, Byeong Hun Min, Kee Hoon Kim, Jinho Lee
Ca1-x Lax FeAs2 (CLFA112) belongs to a new family of Fe-based superconductors (FeSCs) and has a unique crystal structure featuring an arsenic zigzag chain layer, which has been proposed to be a possible two-dimensional topological insulator. This suggests that CLFA112 is a potential topological superconductor-a platform to realize Majorana fermions. Up to now, even a clear superconducting (SC) gap in CLFA112 has never been observed, and the SC properties of CLFA112 remain largely elusive. In this letter, we report the results of an atomic-scale investigation of the electronic structure of CLFA112 crystals using low-temperature scanning tunneling microscopy (STM)...
February 4, 2023: Nanomaterials
https://read.qxmd.com/read/36796103/dynamic-heat-and-charge-transports-through-double-quantum-dot-interferometer-modulated-by-majorana-bound-states-and-time-oscillating-aharonov-bohm-%C3%AF-ux
#33
JOURNAL ARTICLE
Wei-Ke Zou, Qing Wang, Hong-Kang Zhao
Dynamic properties of Majorana fermion coupled double-quantum-dot (DQD) interferometer threaded with ac magnetic flux are investigated, and the time-averaged thermal current formulas are derived. Photon-assisted local and nonlocal Andreev reflections contribute efficiently to the charge and heat transports. The modifications of source-drain electric, electric-thermal, thermal conductances (G, ξ, κe), Seebeck coefficient (Sc), and thermoelectric figure of merit (ZT ) versus AB phase have been calculated numerically...
February 16, 2023: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/36770369/topological-defects-created-by-gamma-rays-in-a-carbon-nanotube-bilayer
#34
JOURNAL ARTICLE
Halina Grushevskaya, Andrey Timoshchenko, Ihor Lipnevich
Graphene sheets are a highly radiation-resistant material for prospective nuclear applications and nanoscale defect engineering. However, the precise mechanism of graphene radiation hardness has remained elusive. In this paper, we study the origin and nature of defects induced by gamma radiation in a graphene rolled-up plane. In order to reduce the environmental influence on graphene and reveal the small effects of gamma rays, we have synthesized a novel graphene-based nanocomposite material containing a bilayer of highly aligned carbon nanotube assemblies that have been decorated by organometallic compounds and suspended on nanoporous Al2O3 membranes...
January 19, 2023: Nanomaterials
https://read.qxmd.com/read/36707603/thermoelectric-properties-of-topological-chains-coupled-to-a-quantum-dot
#35
JOURNAL ARTICLE
A C P Lima, R C Bento Ribeiro, J H Correa, Fernanda Deus, M S Figueira, Mucio A Continentino
Topological one-dimensional superconductors can sustain zero energy modes protected by different kinds of symmetries in their extremities. Observing these excitations in the form of Majorana fermions is one of the most intensive quests in condensed matter physics. We are interested in another class of one-dimensional topological systems in this work, namely topological insulators. Which present symmetry-protected end modes with robust properties and do not require the low temperatures necessary for topological superconductivity...
January 27, 2023: Scientific Reports
https://read.qxmd.com/read/36619974/topological-superconductivity-and-large-spin-hall-effect-in-the-kagome-family-ti-6-x-4-x%C3%A2-bi-sb-pb-tl-and-in
#36
JOURNAL ARTICLE
Xin-Wei Yi, Zheng-Wei Liao, Jing-Yang You, Bo Gu, Gang Su
Topological superconductors (TSC) become a focus of research due to the accompanying Majorana fermions. However, the reported TSC are extremely rare. Recent experiments reported kagome TSC AV3 Sb5 (A = K, Rb, and Cs) exhibit unique superconductivity, topological surface states (TSS), and Majorana bound states. More recently, the first titanium-based kagome superconductor CsTi3 Bi5 with nontrivial topology was successfully synthesized as a perspective TSC. Given that Cs contributes little to electronic structures of CsTi3 Bi5 and binary compounds may be easier to be synthesized, here, by first-principle calculations, we predict five stable nonmagnetic kagome compounds Ti6 X4 (X = Bi, Sb, Pb, Tl, and In) which exhibit superconductivity with critical temperature Tc = 3...
January 20, 2023: IScience
https://read.qxmd.com/read/36605814/optical-properties-of-extreme-tellurium-nanowires-formed-in-subnanometer-diameter-channels
#37
JOURNAL ARTICLE
Vladimir V Poborchii, Alexander V Fokin, Alexander A Shklyaev
Single tellurium (Te) chains attract much attention as extreme nanowires with unique electronic and spintronic properties. Here, we encapsulate Te from a melt into channels of zeolites AFI (∼0.73 nm-channel diameter) and mordenite (MOR, ∼0.67 × 0.7 nm2 channel cross-section) via high-pressure injection. Using polarized Raman and optical absorption spectra (RS and OAS) of zeolite single crystals with Te (AFI-Te and MOR-Te), we discriminate between features of Te chains and rings formed in the zeolites...
December 20, 2022: Nanoscale advances
https://read.qxmd.com/read/36541508/disconnected-entanglement-entropy-as-a-marker-of-edge-modes-in-a-periodically-driven-kitaev-chain
#38
JOURNAL ARTICLE
Saikat Mondal, Diptiman Sen, Amit Dutta
We study the disconnected entanglement entropy (DEE) of a Kitaev chain in which the chemical potential is periodically modulated with δ -function pulses within the framework of Floquet theory. For this driving protocol, the DEE of a sufficiently large system with open boundary conditions turns out to be integer-quantized, with the integer being equal to the number of Majorana edge modes localized at each edge of the chain generated by the periodic driving, thereby establishing the DEE as a marker for detecting Floquet Majorana edge modes...
December 16, 2022: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/36396962/planar-thermal-hall-effect-of-topological-bosons-in-the-kitaev-magnet-%C3%AE-rucl-3
#39
JOURNAL ARTICLE
Peter Czajka, Tong Gao, Max Hirschberger, Paula Lampen-Kelley, Arnab Banerjee, Nicholas Quirk, David G Mandrus, Stephen E Nagler, N P Ong
The honeycomb magnet α-RuCl3 has attracted considerable interest because it is proximate to the Kitaev Hamiltonian whose excitations are Majoranas and vortices. The thermal Hall conductivity κxy of Majorana fermions is predicted to be half-quantized. Half-quantization of κxy /T (T, temperature) was recently reported, but this observation has proven difficult to reproduce. Here, we report detailed measurements of κxy on α-RuCl3 with the magnetic field B ∥ a (zigzag axis). In our experiment, κxy /T is observed to be strongly temperature dependent between 0...
November 17, 2022: Nature Materials
https://read.qxmd.com/read/36332260/solvable-3d-kondo-lattice-exhibiting-pair-density-wave-odd-frequency-pairing-and-order-fractionalization
#40
JOURNAL ARTICLE
Piers Coleman, Aaditya Panigrahi, Alexei Tsvelik
The Kondo lattice model plays a key role in our understanding of quantum materials, but a lack of small parameters has posed a long-standing problem. We present a three-dimensional S=1/2 Kondo lattice model describing a spin liquid within an electron sea. Strong correlations in the spin liquid are treated exactly, enabling a controlled analytical approach. Like a Peierls or BCS phase, a logarithmically divergent susceptibility leads to an instability into a new phase at arbitrarily small Kondo coupling. Our solution captures a plethora of emergent phenomena, including odd-frequency pairing, pair density wave formation and order fractionalization...
October 21, 2022: Physical Review Letters
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