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Observation of the Kondo screening cloud 期刊论文
NATURE, 2020, 579 (7798) : 210-+
作者:  Shahnawaz, Mohammad;  Mukherjee, Abhisek;  Pritzkow, Sandra;  Mendez, Nicolas;  Rabadia, Prakruti;  Liu, Xiangan;  Hu, Bo;  Schmeichel, Ann;  Singer, Wolfgang;  Wu, Gang;  Tsai, Ah-Lim;  Shirani, Hamid;  Nilsson, K. Peter R.;  Low, Phillip A.;  Soto, Claudio
收藏  |  浏览/下载:21/0  |  提交时间:2020/07/03

When a magnetic impurity exists in a metal, conduction electrons form a spin cloud that screens the impurity spin. This basic phenomenon is called the Kondo effect(1,2). Unlike electric-charge screening, the spin-screening cloud(3-6) occurs quantum coherently, forming spin-singlet entanglement with the impurity. Although the spins interact locally around the impurity, the Kondo cloud can theoretically spread out over several micrometres. The cloud has not so far been detected, and so its physical existence-a fundamental aspect of the Kondo effect-remains controversial(7,8). Here we present experimental evidence of a Kondo cloud extending over a length of micrometres, comparable to the theoretical length xi(K). In our device, a Kondo impurity is formed in a quantum dot(2,9-11), coupling on one side to a quasi-one-dimensional channel(12) that houses a Fabry-Perot interferometer of various gate-defined lengths L exceeding one micrometre. When we sweep a voltage on the interferometer end gate-separated by L from the quantum dot-to induce Fabry-Perot oscillations in conductance we observe oscillations in the measured Kondo temperature T-K, which is a signature of the Kondo cloud at distance L. When L is less than xi(K) the T-K oscillation amplitude becomes larger as L becomes smaller, obeying a scaling function of a single parameter L/xi(K), whereas when L is greater than xi(K) the oscillation is much weaker. Our results reveal that xi(K) is the only length parameter associated with the Kondo effect, and that the cloud lies mostly within a length of xi(K). Our experimental method offers a way of detecting the spatial distribution of exotic non-Fermi liquids formed by multiple magnetic impurities or multiple screening channels(13-16) and of studying spin-correlated systems.


  
Empowering Latina scientists 期刊论文
SCIENCE, 2019, 363 (6429) : 825-826
作者:  Bernal, Ximena E.;  Rojas, Bibiana;  Pinto-E, Maria Alejandra;  Mendoza-Henao, Angela M.;  Herrera-Montes, Adriana;  Isabel Herrera-Montes, Maria;  Caceres Franco, Andrea del Pilar;  Ceron-Souza, Ivania;  Paz, Andrea;  Vergara, Daniela;  Barragan Contreras, Leidy Alejandra;  Salazar, Camilo;  Bohorquez Alonso, Martha Lucia;  Guarnizo, Carlos E.;  Sanchez, Adriana;  Olaya-Castro, Alexandra;  Urbina-Cardona, Nicolas;  Guayasamin, Juan M.;  Uy, Floria Mora-Kepfer;  Feris, Faride Lamadrid;  Franco-Orozco, Barbara;  Munoz, Martha M.;  Patricia Rincon-Diaz, Martha;  Sanchez Herrera, Melissa;  Betancourth-Cundar, Mileidy;  Tarvin, Rebecca D.;  Marquez, Roberto;  Lopez-Aguirre, Camilo;  Ron, Santiago R.;  Ramirez, Santiago;  Paez-Vacas, Monica;  Gaitan-Espitia, Juan Diego;  Navarrete-Mendez, Maria J.;  Vianna, Juliana A.;  Varela-Jaramillo, Andrea;  Sanchez-Martinez, Paola M.;  Caminer Rodriguez, Marcel Adrian;  Garcia-Robledo, Carlos;  Kuprewicz, Erin K.;  Gomez-Bahamon, Valentina;  Chacon-Vargas, Katherine;  Trillo, Alex;  Ramirez Castaneda, Valeria;  Buenaventura, Eliana;  Carolina Monmany-Garzia, A.;  Carolina Carnaval, Ana;  Dick, Christopher W.;  Jose Andrade-Nunez, Maria;  Carvajal Castro, Juan David;  Marcela Pinto, Diana;  Camargo-Sanabria, Angela A.;  Lips, Karen R.;  Motta-Gonzalez, Diana;  Canedo, Clarissa;  Melissa Diaz, Jhandra;  Navarro-Suarez, Adriana M.;  Corredor, Karen;  Roa-Varon, Adela;  Flechas, Sandra V.;  Andres Martinez-Lanfranco, Juan;  Chiarioni Thome, Maria Tereza;  Caldwell, Michael S.;  Ballestas, Onil;  Mejia M, Carolina;  Chaverri, Gloriana;  Rossi, Alejandra;  Bonaccorso, Elisa;  Pimiento, Catalina;  Guerrero, Rafael F.;  Warkentin, Karen M.;  Montoya-Pachongo, Carolina;  Alvarez, Silvia J.;  Gonzalez-Duran, Gustavo;  Anganoy-Criollo, Marvin;  Martinez-Habibe, Maria Cristina;  Ramirez, Juan P.;  Burrowes, Patricia;  Catenazzi, Alessandro;  Riveros, Andre J.;  Targino, Mariane;  Velez, Alejandro;  Vargas, Oscar M.;  Zapata, Felipe;  Waltrick, Camilla Spengler;  Ceron, Karoline;  Segovia Salcedo, Claudia;  Silva-Velasco, Martha;  Ochoa-Herrera, Valeria;  Medina, Iliana;  Narins, Peter M.;  Alves Saccol, Suelen da Silva;  de Castro Godinho, Marcela Brasil;  Velasquez Escobar, Beatriz Eugenia;  Velasco, Julian A.;  Lomascolo, Silvia;  Hoke, Kim;  Zeidemann, Vivian;  Almeida-Santos, Patricia;  Paola Ferraro, Daiana;  Araujo-Vieira, Katyuscia;  da Rocha, Sabine Borges;  Torres, Maria Fernanda;  Daniel Cadena, Carlos;  Collevatti, Rosane Garcia;  Vasconcellos, Mariana Mira;  Recart, Wilnelia;  Mitchell Aide, T.;  Bacon, Christine;  Jeckel, Adriana Moriguchi;  Diele-Viegas, Luisa Maria;  Calijorne Lourenco, Ana Carolina;  Santos, Danusy Lopes;  Rieder Cholak, Luiza;  Mendes, Roberta Graboski;  Silva, Fernanda Magalhaes;  Guedes, Thais;  Lopez-Perilla, Yeny R.;  Fusinatto, Luciana Ardenghi;  Terra, Juliana de Souza;  Rodriguez Brenes, Sofia;  Narvaez, Andrea E.;  Zina, Juliana;  Calderon-Espinosa, Martha L.;  Pardo-Diaz, Carolina;  Abadie, Michelle;  Maldonado-Chaparro, Adriana;  Cespedes Arias, Laura N.;  Montesinos, Rachel;  Fenker, Jessica;  Brunes, Tuliana Oliveira;  Ferreira Lantyer Silva, Amanda Santiago;  Vallejos, Johana Goyes;  Costa Rodrigues, Ana Paula V.;  Friol, Natalia Rizzo;  Herrera-Alvarez, Santiago;  de Souza, Eletra;  Araujo, Olivia G. S.;  Citeli, Nathalie Q. K.;  Ruggeri, Joice;  Fierro-Calderon, Eliana;  Acevedo-Charry, Orlando;  Barato, Paola;  Campos-Cerqueira, Marconi;  Mazzini, Flavia;  Beltran, Ivan;  Alejandra Meneses-Giorgi, Maria;  Jerez, Adriana;  Clavijo, Andrea P.;  Neira Jimenez, Carolina;  Dantas, Gisele P. M.;  Nascimento, Luciana Barreto;  Caballero, Susana J.;  Henao Sepulveda, A. Carolina;  Wolff, Marta;  Barnabe, Paula Cristina;  Quinones-Lebron, Shakira G.;  Bressan, Raissa Fries;  Gomez-Montoya, Nataly;  Gomez, Camila;  Colon-Pineiro, Zuania;  Esquivel Dobles, Carolina;  Bloch, Natasha;  Stynoski, Jennifer L.;  Arango, Daniel;  Marisol Gonzalez, Tania;  Luque Moreno, Francisco;  Taylor, Ryan;  Lawrence, J. P.;  Briscoe, Adriana Darielle Mejia;  Ortiz-Barrientos, Daniel;  Elena Salerno, Patricia;  Restrepo, Silvia;  Pasukonis, Andrius;  Damasceno, Roberta Pacheco;  Cecilia Dalton, Maria;  Proehl, Heike;  Valdez-Ward, Evelyn;  Andrea Rodriguez, Sabrina;  Marquez Garcia, Marcela;  Bianca Bonaparte, Eugenia;  Molina Escobar, Jorge Alberto;  Brown, Jason L.;  Yeager, Justin;  Kikuchi, David;  Ringler, Max;  Duran, Linda Hernandez;  Schulte, Lisa M.;  Vaira, Marcos;  Pereyra, Laura;  Astudillo Bravo, Diana;  Jose Salica, Maria;  Varga, Sandra;  Eguren, Antonieta;  Grattarola, Florencia;  Bernal, Moises A.;  Soledad Gaston, Maria;  Ortega Chinchilla, Jesus Eduardo;  Burdfield-Steel, Emily;  Valencia, Lina M.;  Ringler, Eva;  Rada, Marco;  Melendez-Ackerman, Elvia;  Botero, Carlos A.;  Estrada-Villegas, Sergio;  Orizaola, German;  Pinto, Brendan J.;  Gonzalez-Bellido, Paloma;  Hunter, Kimberly L.;  Rueda Solano, Luis Alberto;  Gordon, Swanne;  Guerra, Monica A.;  Jose Albo, Maria;  Vega-Frutis, Rocio;  Blundo, Cecilia;  Castaneda-Gomez, Laura;  Donnelly, Maureen A.;  Escobar, Betsabe D. Castro;  Isabel Moreno, Maria;  Crawford, Andrew J.;  Jiggins, Chris D.;  Roessler, Daniela C.;  Bravo Valencia, Laura;  Sarmiento, Carolina;  Munoz, Karen A.;  Galeano, Sandra P.;  del Rosario Castaneda, Maria;  Caro Cardenas, Cindy Jeanet;  Zalamea, Paul-Camilo;  Arias, Monica;  Zank, Caroline;  Suarez-Mayorga, Angela M.;  Colombo, Patrick;  Cuervo, Andres M.;  Coriolano, Iara Reinaldo;  de Melo, Lilian Sayuri Ouchi;  Buitrago Cardona, Alexandra;  Elias, Marianne;  Gonzalez, Mabel;  Maria Aldana, Ana;  Gubert, Carolina;  Luis Parra, Juan;  Contador, Tamara;  Coelho, Lorena;  Trillo, Mariana;  Bordin, Kauane;  Zulian, Viviane;  Moreno Arias, Rafael;  Loretto, Matthias-Claudio;  Alejandra Medina, Claudia;  Lyra, Mariana L.;  Pulido-Santacruz, Paola;  Rosser, Neil;  Waldron, Talia;  Moreno Duran, Carmen Helena;  Pizano, Camila;  Hoedl, Walter;  Fratani, Jessica;  Duport Bru, Ana Sofia;  Grosso, Jimena;  Vera Candioti, Florencia;  Adarve Rengifo, Isabel
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