Using coherent phonons for ultrafast control of the Dirac node of 
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Weber, Carsten; Masten, Madison G.; Ogloza, Thomas; Berggren, Bryan; Man, Michael K. L.; Dani, Keshav M.; Liu, Jinyu; Mao, Zhiqiang; Klug, D. D.; Adeleke, Adebayo A.; Yao, Yansun

doi:10.1103/physrevb.98.155115

Cited by 17 publications

(5 citation statements)

References 49 publications

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“…Excitation by laser light pulses can allow the topological state to be changed at ultrafast timescales via excitation of coherent phonons. Both TaAs and SrMnSb 2 exhibit coherent phonons [ 35 , 36 ], and such properties could be enhanced by epitaxial control of film thicknesses and the phononic properties of the surrounding material.…”

Section: Introductionmentioning

confidence: 99%

Heteroepitaxial Growth of InBi(001)

Rehaag,

Bell

2024

Molecules

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InBi is a topological nodal line semimetal with strong spin–orbit coupling. It is epitaxially compatible with III–V semiconductors and, hence, an attractive material for topological spintronics. However, growth by molecular beam epitaxy (MBE) is challenging owing to the low melting point of InBi and the tendency to form droplets. We investigate approaches for epitaxial growth of InBi films on InSb(001) substrates using MBE and periodic supply epitaxy (PSE). It was not possible to achieve planar, stoichiometric InBi heteroepitaxy using MBE growth over the parameter space explored. However, pseudomorphic growth of ultra-thin InBi(001) layers could be achieved by PSE on InSb(001). A remarkable change to the in-plane epitaxial orientation is observed.

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Section: Introductionmentioning

confidence: 99%

Heteroepitaxial Growth of InBi(001)

Rehaag,

Bell

2024

Molecules

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“…Arguably the apogee of this field is being able to control the lattice, electronic, and/or topological structure of these materials on ultrafast time scales by using light. The first work toward this was in 2018 when Weber et al looked closely at the excitation of coherent phonons in Sr 0.94 Mn 0.92 Sb 2 . The researchers noticed that pumping the material at 1.55 eV coherently launched three phonon modes, particularly an A g mode at 147 cm –1 (“mode 36”).…”

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confidence: 99%

“…The first work toward this was in 2018 when Weber et al looked closely at the excitation of coherent phonons in Sr 0.94 Mn 0.92 Sb 2 . 59 The researchers noticed that pumping the material at 1.55 eV coherently launched three phonon modes, particularly an A g mode at 147 cm −1 ("mode 36"). DFT calculations showed that "mode 36"which buckles the Sb/Mn layers but not the square netcan have a profound effect on the material's band structure.…”

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confidence: 99%

Square-Net Topological Semimetals: How Spectroscopy Furthers Understanding and Control

Kirby

Scholes

Schoop

2022

J. Phys. Chem. Lett.

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Square-net materials are well positioned to lead optical spectroscopic explorations into the electronic structure, photoinduced dynamics, and phase transitions in topological semimetals. Hundreds of square-net topological semimetals can be prepared that have remarkably different electronic and optical properties despite having similar structures. Here we present what has been gleaned recently from these materials with the whole gamut of optical spectroscopies, ranging from steady-state reflectance and Raman investigations into topological band structures, electronic correlations, and equilibrium phase transitions to time-resolved techniques used to decipher ultrafast relaxation dynamics and nonequilibrium photoinduced phase transitions. We end with a discussion of some major remaining questions and possible future research directions.

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“…In particular, Dirac dispersions interacting with magnetism have significant potential for producing rich quantum transport [2][3][4]. Recently, ternary layered pnictides ABX 2 (A : rare or alkaline earths, B : transition metals, X : Sb/Bi) have been reported to host highly anisotropic Dirac or Weyl dispersions [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], and unprecedented quantum transport has been observed originating from the interplay between the Dirac dispersion and magnetic ordering, as exemplified by bulk half-integer quantum Hall effect in EuMnBi 2 [5,6], BaMnSb 2 [7,8], and SrMnSb 2 [9]. Therefore, exploring new ABX 2 compounds especially with magnetic A and/or B ions is important for systematically investigating their unique magnetotransport.…”

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confidence: 99%

“…As seen in the map in Fig. 1(b), it becomes difficult to stabilize ABSb 2 with smaller A-site and larger B-site ionic radii, and nearly half of ABSb 2 has not been synthesized yet for all the possible combinations of the A and B cations [9][10][11][12][13][14][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. In this lower right region of the map in Fig.…”

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confidence: 99%

Molecular beam deposition of a new layered pnictide with distorted Sb square nets

Ohno,

Uchida,

Nakazawa

et al. 2021

Preprint

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While the family of layered pnictides ABX 2 (A : rare or alkaline earth metals, B : transition metals, X : Sb/Bi) can host Dirac dispersions based on Sb/Bi square nets, nearly half of them has not been synthesized yet for possible combinations of the A and B cations. Here we report the fabrication of EuCdSb 2 with the largest B-site ionic radius, which is stabilized for the first time in thin film form by molecular beam deposition. EuCdSb 2 crystallizes in an orthorhombic P nma structure and exhibits antiferromagnetic ordering of the Eu magnetic moments at T N = 15 K. Our successful growth will be an important step for further exploring novel Dirac materials using film techniques.

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Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2

Cited by 17 publications

References 49 publications

Heteroepitaxial Growth of InBi(001)

Heteroepitaxial Growth of InBi(001)

Square-Net Topological Semimetals: How Spectroscopy Furthers Understanding and Control

Molecular beam deposition of a new layered pnictide with distorted Sb square nets

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