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https://oasis.postech.ac.kr/handle/2014.oak/388
2024-03-28T03:51:59ZDirect Observation of Surface Plasmon-Controlled Ultrafast Melting and Acoustic Shape Deformation in Au Nanorod
https://oasis.postech.ac.kr/handle/2014.oak/122296
Title: Direct Observation of Surface Plasmon-Controlled Ultrafast Melting and Acoustic Shape Deformation in Au Nanorod
Authors: EUNYOUNG, PARK; JUNHA, HWANG; SUNG, YUN LEE; JAEYOUNG, SHIN; HEOSEUNGPIL, HEOSEUNGPIL; HEEMIN, LEE; NAM, DAEWOONG; KIM, SANGSOO; KIM, MINSEOK; EOM, INTAE; SONG, CHANGYONG2024-02-07T00:00:00ZDual-species Bose-Einstein condensates of 23Na and 41K with tunable interactions
https://oasis.postech.ac.kr/handle/2014.oak/120419
Title: Dual-species Bose-Einstein condensates of 23Na and 41K with tunable interactions
Authors: Chang, Jaeryeong; Lee, Sungjun; Kim, Yoonsoo; Lim, Younghoon; Park, Jee Woo2024-02-01T00:00:00ZDual Higgs modes entangled into a soliton lattice in CuTe
https://oasis.postech.ac.kr/handle/2014.oak/120762
Title: Dual Higgs modes entangled into a soliton lattice in CuTe
Authors: Kwon Seongjin; Jung Hyunjin; Lee Sangjin; Cho, Gil Young; Kong Kijeong; Won Choongjae; Cheong Sang-Wook; Yeom Han Woong
Abstract: Recently discovered Higgs particle is a key element in the standard model of elementary particles and its analogue in materials, massive Higgs mode, has elucidated intriguing collective phenomena in a wide range of materials with spontaneous symmetry breaking such as antiferromagnets, cold atoms, superconductors, superfluids, and charge density waves (CDW). As a straightforward extension beyond the standard model, multiple Higgs particles have been considered theoretically but not yet for Higgs modes. Here, we report the real-space observations, which suggest two Higgs modes coupled together with a soliton lattice in a solid. Our scanning tunneling microscopy reveals the 1D CDW state of an anisotropic transition metal monochalcogenide crystal CuTe is composed of two distinct but degenerate CDW structures by the layer inversion symmetry broken. More importantly, the amplitudes of each CDW structure oscillate in an out-of-phase fashion to result in a regular array of alternating domains with repeating phase-shift domain walls. This unusual finding is explained by the extra degeneracy in CDWs within the standard Landau theory of the free energy. The multiple and entangled Higgs modes demonstrate how novel collective modes can emerge in systems with distinct symmetries broken simultaneously.,The Higgs mode in condensed matter physics refers to the oscillations of the amplitude of the order parameter, and single Higgs modes have been studies in various systems. Here the authors report real-space observation of two coupled Higgs modes in a 1D charge density wave phase of CuTe.,2024-02-01T00:00:00ZA symmetry principle for gauge theories with fractons
https://oasis.postech.ac.kr/handle/2014.oak/120683
Title: A symmetry principle for gauge theories with fractons
Authors: HIRONO, YUJI; YOU, MINYOUNG; ANGUS, STEPHEN; CHO, GIL YOUNG
Abstract: Fractonic phases are new phases of matter that host excitations with restricted mobility. We show that a certain class of gapless fractonic phases are realized as a result of spontaneous breaking of continuous higher-form symmetries whose conserved charges do not commute with spatial translations. We refer to such symmetries as nonuniform higherform symmetries. These symmetries fall within the standard definition of higher-form symmetries in quantum field theory, and the corresponding symmetry generators are topological. Worldlines of particles are regarded as the charged objects of 1-form symmetries, and mobility restrictions can be implemented by introducing additional 1-form symmetries whose generators do not commute with spatial translations. These features are realized by effective field theories associated with spontaneously broken nonuniform 1-form symmetries. At low energies, the theories reduce to known higher-rank gauge theories such as scalar/vector charge gauge theories, and the gapless excitations in these theories are interpreted as Nambu-Goldstone modes for higher-form symmetries. Due to the nonuniformity of the symmetry, some of the modes acquire a gap, which is the higher-form analogue of the inverse Higgs mechanism of spacetime symmetries. The gauge theories have emergent nonuniform magnetic symmetries, and some of the magnetic monopoles become fractonic. We identify the 't Hooft anomalies of the nonuniform higher-form symmetries and the corresponding bulk symmetry-protected topological phases. By this method, the mobility restrictions are fully determined by the choice of the commutation relations of charges with translations. This approach allows us to view existing (gapless) fracton models such as the scalar/vector charge gauge theories and their variants from a unified perspective and enables us to engineer theories with desired mobility restrictions.2024-02-01T00:00:00Z