장소 | #1323 (1st fl., E6-2.) |
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일시 | Nov. 3 (Fri.), 4:00 PM |
연사 | Dr. SungDae Ji (Max Planck POSTECH/Hshinchu Center (MPK)) |
The seminal work of Anderson triggered a great deal of theoretical and experimental efforts to search for the novel quantum spin liquid (QSL) states in matters, and it has become one of central issues in contemporary condensed matter physics. The QSL state, a long-range quantum entangled state, is represented by a topological order and fractionalization of constituent magnetic moments. While the most QSL states have been described by deconfined spinons as an elementary excitation in frustrated magnets, Kitaev’s QSL state is exactly derived by fractionalizing the spin excitation into Majorana fermions in a two-dimensional honeycomb lattice, the so-called Kitaev lattice, with the ansatz of bond dependent Ising-like spin interaction. In the past decade, experimental realization of the fascinating Kitaev honeycomb QSL model has been eagerly pursued. In this talk, I will present the experimental evidences of fractionalized Majorana fermions in a high quality α-RuCl3 single crystal. Neutron and x-ray diffraction measurements reveal that the low-temperature crystal structure forms the perfect Ru-honeycomb lattice, which provides an ideal platform for the Kitaev honeycomb quantum spin lattice. Extensive thermodynamic and neutron spectroscopic measurements directly proved fractionalized Majorana fermion excitations as a result of thermal fractionalization of Jeff = ½ pseudospins, which is well reproduces by numerical predictions obtained from the Kitaev model.
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139 | DEC. 16~18 (Sun~Tue) | E6-2. 1st fl. #1323 | Prof. Keisuke Totsuka |
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138 | DEC. 11 (Tue), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Hiroshi Shinaoka |
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137 | Dec. 7 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Joon Ho Jang |
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136 | Dec. 7 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Gyung Min Choi |
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135 | Nov. 9 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Donghun Lee |
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134 | Nov. 9 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Pilkyung Moon |
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133 | Oct. 12 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. HyungWoo Lee |
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132 | Oct. 12 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Daniel Kyungdeock Park |
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131 | Jun. 01 (Fri.), 11:00 AM | E6-2. 1st fl. #1323 | Dr. Seung Sae Hong |
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130 | May. 17 (Thu.), 01:30 PM | E6-2. 1st fl. #1323 | Prof. Yong-Baek Kim University of Toronto |
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129 | May. 11 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Nam Kim |
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128 | May. 11 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Kun Woo Kim |
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127 | Apr. 09 (Mon.), 11:00 AM | E6-2. 1st fl. #1323 | Dr. Seung-Sup B. Lee |
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126 | Mar. 16 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. JinHee Kim |
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125 | Mar. 16 (Fri.), 04:0 PM | E6-2. 1st fl. #1323 | Dr. YoungDuck Kim |
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124 | Sep. 22 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. GilHo Lee / Department of Physics, POSTECH |
Unexpected Electron-Pairing in Integer Quantum Hall Effect
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123 | Sep. 22 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. GilHo Lee / Department of Physics, POSTECH |
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122 | Sep. 22 (Fri.), 01:00 PM | E6-2. 1st fl. #1323 | Dr. EunSeong Kim / Department of Physics, KAIST |
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121 | Jun. 2 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Euyheon Hwang(황의헌) |
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