The dependence of photosensitivity on composition for thin films of Ge x As y Se1–x–y chalcogenide glasses

Su, Xueqiong; Wang, Rongping; Luther‐Davies, Barry; Wang, Li

doi:10.1007/s00339-013-7585-7

Cited by 69 publications

(57 citation statements)

References 28 publications

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“…For quantum magnets with magnetic long-range order the thermal Hall effect has been realized in the collinear kagomé ferromagnet Cu(1-3, bdc) [35] and a number of collinear pyrochlore ferromagnets [36,37]. In this case the transverse thermal Hall conductivity (κ xy ) can be explained in terms of Berry curvature induced by the DM spin-orbit interaction [38][39][40] leading to topological magnons [41][42][43][44][45][46][47][48][49] and Weyl magnons [50,51] similar to spin-orbit coupling electronic systems [52][53][54][55][56]. In a recent experiment [57], a nonzero κ xy has been observed in a frustrated distorted kagomé volborthite at a strong magnetic field of 15 T with no signs of the DM spin-orbit interaction and no discernible thermal Hall signal was observed at zero magnetic field [58].…”

Section: Introductionmentioning

confidence: 99%

Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Owerre¹

2017

EPL

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In this Letter, we identify a noncoplanar chiral spin texture on the distorted kagomé-lattice antiferromagnets induced by the presence of a magnetic field applied perpendicular to the distorted kagomé plane. The noncoplanar chiral spin texture has a nonzero scalar spin chirality similar to a chiral quantum spin liquid with broken time-reversal symmetry. In the noncoplanar regime we observe nontrivial topological magnetic excitations and thermal Hall response through the emergent field-induced scalar spin chirality in contrast to collinear ferromagnets in which the DzyaloshinskiiMoriya (DM) spin-orbit interaction is the driving force. Our results shed light on recent observation of thermal Hall conductivity in distorted kagomé volborthite at nonzero magnetic field with no signal of DM spin-orbit interaction, and the results also apply to other distorted kagomé antiferromagnets such as vesignieite and edwardsite.

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Section: Introductionmentioning

confidence: 99%

Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Owerre¹

2017

EPL

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“…The TAI has been investigated in many related models and systems, such as Haldane model, KaneMele model, the three dimensional Dirac-Wilson model and semimetal systems [32][33][34][35][36][37] . Topological phase transitions driven by disorder and transport properties have been studied in various electronic systems, in which many intriguing phenomena were observed due to the interplay between topology and disorder [38][39][40][41][42][43][44][45] .…”

Section: Introductionmentioning

confidence: 99%

Disorder-induced topological phase transitions on Lieb lattices

Chen

Zhou

2017

Phys. Rev. B

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Motivated by the very recent experimental realization of electronic Lieb lattices and research interest on topological states of matter, we study the topological phase transitions driven by Andersontype disorder on spin-orbit coupled Lieb lattices in the presence of spin-independent and dependent staggered potentials. By combining the recursive Green's function and self-consistent Born approximation methods, we found that both time-reversal-invariant and time-reversal-symmetry-broken spin-orbit coupled Lieb lattice systems can host the disorder-induced gapful topological phases, including the quantum spin Hall insulator (QSHI) and quantum anomalous Hall insulator (QAHI) phases. For the time-reversal-invariant case, the disorder induces a topological phase transition directly from a normal insulator (NI) to the QSHI. While for the time-reversal-symmetry-broken case, the disorder can induce either a QAHI-QSHI phase transition or a NI-QAHI-QSHI phase transition, depending on the initial state of the system. Remarkably, the time-reversal-symmetry-broken QSHI phase can be induced by Anderson-type disorder on the spin-orbit coupled Lieb lattices without time-reversal symmetry.

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“…Instead, the magnon bands would carry nonzero Chern numbers and topological surface states would appear. Other topological states are likely, e. g., Weyl points [21,37].…”

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confidence: 99%

Magnon nodal-line semimetals and drumhead surface states in anisotropic pyrochlore ferromagnets

2017

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We introduce a new type of topological magnon matter: the magnonic pendant to electronic nodal-line semimetals. Magnon spectra of anisotropic pyrochlore ferromagnets feature twofold degeneracies of magnon bands along a closed loop in reciprocal space. These magnon nodal lines are topologically protected by the coexistence of inversion and time-reversal symmetry; they require the absence of spin-orbit interaction (no Dzyaloshinskii-Moriya interaction). We calculate the topological invariants of the nodal lines and show that details of the associated magnon drumhead surface states depend strongly on the termination of the surface. Magnon nodal-line semimetals complete the family of topological magnons in three-dimensional ferromagnetic materials.Introduction. Over the recent years, nontrivial topologies of magnon spectra have become a thriving field of research. In striking analogy to electronic topological matter [1], topological magnon matter has been identified. The 'drosophilae' of such topological magnon insulators (TMIs) [2], which are the pendant to electronic Chern insulators, are (twodimensional) ferromagnets on a kagome lattice with Dzyaloshinskii-Moriya interaction (DMI) [3][4][5][6][7][8][9][10]. The latter causes complex hopping matrix elements in the free-boson Hamiltonian of magnons and, thus, breaks time-reversal symmetry; this points towards the textured magnetic flux in the Haldane model [11]. As a result, Berry curvatures and Chern numbers are nonzero and cause topologically protected edge magnons. The latter revolve unidirectionally the sample in accordance with the bulk-boundary correspondence [12,13]. Recently, Cu-(1,3-benzenedicarboxylate) was identified as a TMI which is very well approximated by the kagome model [14]; TMIs on the honeycomb lattice have been proposed as well [15].The quest for topologically nontrivial systems has been initiated by the discovery of the magnon Hall effect [16,17] in ferromagnetic pyrochlore oxides, mostly because the transverse thermal Hall conductivity has been related to the Berry curvature of the bulk magnons [5,18,19]. The quite natural extension of the topological classification to three-dimensional systems lead to the discovery of magnon Weyl semimetals [20,21], in which the crossing points of two magnon bands act as source and sink of Berry flux (again, in close analogy to electronic systems [22, 23]).In this Letter, we complete the family of topological magnonic objects in three-dimensional ferromagnetic materials by predicting 'magnon nodal-line semimetals' (magnon NLSMs), the magnon pendant of electronic NLSMs [24][25][26][27][28][29]. For this purpose, we consider a ferromagnetic pyrochlore lattice with anisotropic exchange interactions but without spinorbit interaction (SOI). We find two nodal lines, that is, two closed loops in reciprocal space along which two magnon bands are degenerate. On top of this, we identify the protecting symmetries and calculate topological invariants of the nodal lines. Magnon spectra for the (111) surface feature drum...

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The dependence of photosensitivity on composition for thin films of Ge x As y Se1–x–y chalcogenide glasses

Cited by 69 publications

References 28 publications

Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Disorder-induced topological phase transitions on Lieb lattices

Magnon nodal-line semimetals and drumhead surface states in anisotropic pyrochlore ferromagnets

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